通信工程外文翻译---一点多址扩频通信系统的应用

外文原文Introduction to Cellular CDMA中文译文CDMA蜂窝网介绍扩频调制技术已经历了过去40多年来的演化。

扩频技术曾经广泛用于抗干扰和多径场合以及测距和跟踪。

扩频技术还被用于CDMA，以支持在大量群体用户之间同时进行数字通信的服务。

CDMA概念可简单地解释成基于扩频通信的调制和多址接入方案。

本文概要介绍了美国圣迭戈高通公司倡导的CDMA数字蜂窝系统。

在很多参与其中的通信公司和设备制造商(AT＆T，Motorola，North Telecom 和其他)的协作下，基于多址接入方案的数字蜂窝应用也取得了进展，CDMA系统作为候选标准(Is-95)完全符合蜂窝通信工业协会(CTIA)要求。

典型的数字蜂窝系统有GSM(欧洲1990年提出的方案)、NATDMA(北美1990年提出的IS-54方案)、PDC(日本1990年提出的标准方案)以及CDMA(美国1993年提出的IS-95方案)。

1982年6月，西欧提山了基于时分多址(TDMA)的GSM系统。

GSM 能够扩展多样的电信网络(例如ISDN)，并提供了对整个欧洲大陆的兼容性。

1992年，第一个商用GSM系统在德国设计成功。

GSM基于频分多址和时分多址的组合。

NA-TDMA系统和GSM相似，惟一差别在于该系统中仅仅存在一个公共无线接口。

PDC(个人数字蜂窝)是日本提出的TDMA蜂窝系统，工作在800 MHz和1.5GHz。

该系统在数字蜂窝网络之间提供了9个接口。

1.5GHzPDC于1994年公开投入运营。

除了数字多址接入系统，还有TDD无绳电话系统，如PHP，CT-2，DCT-900（或CT-3）以及DECT。

TDD(时分双工)系统都是数字系统，但只使用—个载波发送和接收信息。

PHP(个人便携式电话)是支持PCS(个人通信服务)的TDD无线通信系统。

PHP可以用于住宅无绳电话、私有无线PBX(专用分组交换机)、公众远程点和无线电话通信。

多次反射罐方案DSA用于多跳认知无线电网络的分布式网络编码控制信道Alfred Asterjadhi等著1 前言大多数电磁频谱由政府机构长期指定给公司或机构专门用于区域或国家地区。

由于这种资源的静态分配，许可频谱的许多部分在许多时间和/或位置未使用或未被充分利用。

另一方面，几种最近的无线技术在诸如IEEE802.11，蓝牙，Zigbee之类的非许可频段中运行，并且在一定程度上对WiMAX进行操作;这些技术已经看到这样的成功和扩散，他们正在访问的频谱- 主要是2.4 GHz ISM频段- 已经过度拥挤。

为了为这些现有技术提供更多的频谱资源，并且允许替代和创新技术的潜在开发，最近已经提出允许被许可的设备（称为次要用户）访问那些许可的频谱资源，主要用户未被使用或零星地使用。

这种方法通常被称为动态频谱接入（DSA），无线电设备发现和机会性利用未使用或未充分利用的频谱带的能力通常称为认知无线电（CR）技术。

DSA和CR最近都引起了无线通信和网络界的极大关注。

通常设想两种主要应用。

第一个是认知无线接入（CW A），根据该认知接入点，认知接入点负责识别未使用的许可频谱，并使用它来提供对次用户的接入。

第二个应用是我们在这个技术中研究的应用，它是认知自组织网络（CAN），也就是使用用于二级用户本身之间通信的无许可频谱，用于诸如点对点内容分发，环境监控，安全性等目的，灾难恢复情景通信，军事通信等等。

设计CAN系统比CW A有更多困难，主要有两个原因。

第一是识别未使用的频谱。

在CW A中，接入点的作用是连接到互联网，因此可以使用简单的策略来推断频谱可用性，例如查询频谱调节器在其地理位置的频谱可用性或直接与主用户协商频谱可用性或一些中间频谱经纪人另一方面，在CAN中，与频谱调节器或主要用户的缺乏直接通信需要二级用户能够使用检测技术自己识别未使用的频谱。

第二个困难是辅助用户协调媒体访问目的。

在CW A中存在接入点和通常所有二级用户直接与之通信（即，网络是单跳）的事实使得直接使用集中式媒体接入控制（MAC）解决方案，如时分多址（TDMA）或正交频分多址（OFDMA）。

毕业设计（论文）的外文文献翻译原始资料的题目/来源：Fundamentals of wireless communications by David Tse翻译后的中文题目：无线通信基础专业通信工程学生王晓宇学号110240318班号1102403指导教师杨洪娟翻译日期2015年6月15日外文文献的中文翻译7．mimo：空间多路复用与信道建模本书我们已经看到多天线在无线通信中的几种不同应用。

在第3章中，多天线用于提供分集增益，增益无线链路的可靠性，并同时研究了接受分解和发射分解，而且，接受天线还能提供功率增益。

在第5章中，我们看到了如果发射机已知信道，那么多采用多幅发射天线通过发射波束成形还可以提供功率增益。

在第6章中，多副发射天线用于生产信道波动，满足机会通信技术的需要，改方案可以解释为机会波束成形，同时也能够提供功率增益。

章以及接下来的几章将研究一种利用多天线的新方法。

我们将会看到在合适的信道衰落条件下，同时采用多幅发射天线和多幅接收天线可以提供用于通信的额外的空间维数并产生自由度增益，利用这些额外的自由度可以将若干数据流在空间上多路复用至MIMO信道中，从而带来容量的增加：采用n副发射天线和接受天线的这类MIMO 信道的容量正比于n。

过去一度认为在基站采用多幅天线的多址接入系统允许若干个用户同时与基站通信，多幅天线可以实现不同用户信号的空间隔离。

20世纪90年代中期，研究人员发现采用多幅发射天线和接收天线的点对点信道也会出现类似的效应，即使当发射天线相距不远时也是如此。

只要散射环境足够丰富，使得接受天线能够将来自不同发射天线的信号分离开，该结论就成立。

我们已经了解到了机会通信技术如何利用信道衰落，本章还会看到信道衰落对通信有益的另一例子。

将机会通信与MIMO技术提供的性能增益的本质进行比较和对比是非常的有远见的。

机会通信技术主要提供功率增益，改功率增益在功率受限系统的低信噪比情况下相当明显，但在宽带受限系统的高信噪比情况下则很不明显。

2-port inductor 二端口电感-3 db frequency 截止频率-3 db frequency(CE) 截止频率（共射）AAcceptor atom 受主原子active component 有源元件active element 有源元件active load 有源负载active load 有源负载active power 有功功率active region 放大区adder 加法器address 地址admittance parameter equation 导纳参数方程admittance 导纳air gap 气隙all-pass filter(APF) 全通~ alternating current path 交流通路alternating current(AC/ac) 交变电流alternating load line 交流~ alternating voltage 交变电压ampere (A) 安培Ampere’s circuital law 安培环路定律amplification effect 放大作用amplification 放大倍数amplifier 放大电路amplifier 放大器amplitude frequency characteristic 幅频特性amplitude spectrum 振幅频谱amplitude 幅值amplitude 振幅/幅值amplitude-frequency characteristic 幅频特性analog circuit 模拟电路analog to digital conversion 模-数转换analog to digital converter(ADC) 模-数转换器Analysis of amplifiers 放大电路的分析Analysis of differential amplifiers 差分放大电路的分析AND gate 与门AND 与AND-OR-INVERT gate 与或非门AND-OR-INVERT 与或非angular frequency 角频率apparent power 视在功率application specific integrated circuit(ASIC) 专业集成电路argument 辐角artificial line 人工线astable multivibrator 多谐振荡器asynchronous counter 异步计数器attenuate oscillation 衰减振荡attenuation coefficient 衰减系数attenuation coefficient 衰减系数autonomous equation 自治方程autonomous network 自治网络average power 平均功率Bbacklash 回差Backward Euler method 后向欧拉公式balanced transformerless BTL~band-elimination filter(BEF) 带阻~band-gap reference 能隙基准源band-pass filter(BPF) 带通~band-pass network 带通网络band-stop network 傣族网络bandwidth 通频带barrier ~ 势垒~barrier capacitance 势垒电容base area body resistance( ) 基区体电阻base region 基区base 基极base 基极Bessel filter 贝赛尔~bilateral 双向性binary decoder 二进制译码器binary 二进制binary-coded decimal decoder 二-十进制译码器binary-coded decimal(BCD) 二-十进制Bipolar Junction Transistors 晶体管（双极型管）bipolar-CMOS(Bi-CMOS) 双极型CMOSbit 位Bode plot 波特图bonded electron 束缚电子Boolean algebra 布尔代数bootstrapping circuit 自举电路borrow 借位branch current analysis 支路电流法branch 支路breakdown voltage 击穿电压breakdown voltage 击穿电压bridge rectifier 桥式整流broken-line approximation 拆线法bus 总线Butterworth filter 巴特沃斯~by-pass ~ 旁路~Ccapacitance effect 电容效应capacitance filter 电容滤波capacitance 电容[系数] capacitor 电容capacitor 电容[元件] carrier 载流子carry 进位cascade connection 级联CC-CB amplifier 共集-共基放大电路CCCS 电流控制电流源CCVS 电流控制电压源CE-CB amplifier 共射-共基放大电路center frequency 中心频率channel 沟道channel 沟道character mode display 字符显示器characteristic curve 特性曲线characteristic equation 特性方程characteristic impedance 特性阻抗characteristic impedance 特性阻抗characteristics frequency 特征频率characteristics of amplifiers 放大电路的性能characteristics 特性charge amplifier 电荷放大器Chebyshev filter 切比雪夫~ circuit analysis 电路分析circuit element 电路元件circuit model 电路模型circuit simulation 电路仿真circuit synthesis 电路综合circuit theory 电路理论class A amplification 甲类放大class AB amplification 甲乙类放大class B amplification 乙类放大class C ~ 丙类~ Clipping 限幅clock pulse(CP) 时钟脉冲clock(CLK) 时钟closed-loop gain 闭环增益closed-loop 闭环CMOS circuit CMOS电路coefficient of coupling 耦合系数coefficient of voltage stabilization 稳压系数coercive force 矫顽力coil 线圈coil 线圈collector junction 集电结collector region 集电区collector 集电极collector 集电极Colpitts feedback 电容反馈式（电容三点式）combinational logic 组合逻辑Command Window 命令窗口common base 共基( )common emitter 共射( )Common-base(CB) 共基级Common-collector(CC) 共集电级Common-drain(CD) 共漏极common-emitter(CE) 共发射级common-mode gain 共模放大倍数common-mode rejection ratio 共模抑制比common-mode rejection ratio 共模抑制比common-mode signal 共模信号Common-sources(CS) 共源级commutation 换路comparator 比较器compensation method 校正措施complementary pair 互补电路complementary symmetry metal oxide semiconductor(CMOS) 互补对称式MOS complete response 全响应complex frequency 复频率complex power 复[数]功率complex programmable logic device(CPLD) 复杂的可编程逻辑器件complex reluctance 复磁阻抗computer aided design(CAD) 计算机辅助设计condenser 电容器[容电器] Condition of symmetry 对称条件conductance 电导[系数]configurable logic block(CLB) 可编程逻辑模块conjugate matching 共轭匹配connected graph 连通图constant current region 恒流区constant current source 恒流源constraint condition 约束条件constraint term 约束项constraint 约束construction 结构continuous spectrum 连续频谱controlled source 受控电源convergence 收敛convolution 卷积corresponding terminals 同名端coulomb (C) 库仑counter 计数器coupling ~ 耦合~coupling 耦合couplinig 耦合covalent bond 共价键criterion of oscillation 振荡条件critical state 临界状态cross over distortion 交越失真crystal oscillator 石英晶体~current amplification factor 电流放大系数current controlled nonlinear resistor [电]流控[制]非线性电阻current equation 电流方程current equation 电流方程Current Feedback Operational Amplifier 电流反馈集成运放Current mirror 镜像~current mode 电流模current overload protection 过流保护current resonance 电流谐振current source 电流源current source 电流源current 电流current-output DAC 权电流(电流输出)数-模转换器current-parallel 电流并联current-series 电流串联current-voltage converter 电流电压转换电路cut-off frequency of pass-band 通带截止频率cut-off region 截止区cut-set admittance matrix 割集导纳矩阵cut-set source-current vector 割集源电流向量cut-set 割集Ddamped oscillation 阻尼振荡Darlington connection 复合管data selector/multiplexer 数据选择器/多路调制器DC circuit 直流电路dc component 直流分量DC model 直流模型DC model 直流模型DC operating point 直流工作点DC voltage 直流电压De Morgan’s theorem摩根定理decimal 十进制decoder 译码器delayed unit step function 延迟单位阶跃函数demultiplexer 分配器dependent source 非独立电源depletion type 耗尽型Depletion 耗尽层difference amplifier 差分放大器difference-mode signal 差模信号differential amplifier 差分放大电路differential circuit 微分~ differential gain 差模放大倍数differential input 差分输入differential input 差分输入电压diffusion ~ 扩散~diffusion capacitance 扩散电容Diffusion 扩散digital circuit 数字电路digital comparator 数值比较器digital to analog conversion 数-模转换digital to analog converter(DAC) 数-模转换器diode 二极管diode-transistor logic(DTL) 二极管-三极管逻辑direct coupled ~ 直接耦合~direct coupled 直接耦合direct current path 直流通路direct current 直流direct load line 直流~direct wave 正向行波directed graph 有向图discrete spectrum 离散频谱display 显示器disspative element 耗能元件distortion factor 失真系数distortion 畸变distortion 畸变distributed circuit 分布参数电路divide circuit 除法~don’t care term无关项donor atom 施主原子doping 掺杂drain 漏极drift 漂移dualin-line package 双列直插式封装dual-in-line package(DIP) 双列直插式封装duality principle 对偶原理dual-slope ADC 双积分型模-数转换器duty ratio 占空比dynamic circuits 动态电路dynamic element 动态元件dynamic random access memory(DRAM) 动态随即存储器dynamic resistance 动态电阻dynamic route 动态路径EEbers-Moll model EM（模型）Ebers-Moll model EM模型eddy current 涡流edge-triggered flip-flop 边沿触发器Editor/Debugger 编辑器/调试器effective value 有效值efficiency 效率efficiency 效率electric circuit 电路electric device 电器件electric network 电网络electrical erasable programmable read-only memory(E2PROM) 电可擦除的可编程只读存储器electricity 电electro motive force, EMF 电动势electromagnetism 电磁学Electronic Design Automation 电子设计自动化electronics 电子学emitter couple logic(ECL) 发射极耦合逻辑emitter follower 射级输出器emitter junction 发射结emitter region 发射区emitter 发射极emitter 发射极encode 编码encoder 编码器energy storage element 储能元件enhancement 增强型equation of PN junction PN结方程equilibrium 平衡点equivalent circuit 等效电路equivalent circuit 等效电路equivalent circuit 等效电路equivalent circuit(model) 等效电路（模型）equivalent resistance 等效电阻equivalent sinusoid 等效正弦波erasable programmable logic device(EPLD) 可擦除的可编程逻辑器件erasable programmable read-only memory(EPROM) 可擦除的可编程只读存储器excitation 激励Exclusive-OR gate 异或门Exclusive-OR 异或exponential circuit 指数~Ffall time 下降时间fan-out 扇出features of integrated circuits 集成电路特点feedback amplifiers 反馈放大电路feedback configuration 反馈组态feedback path 反馈通路feedback polarity examination 反馈极性判断feedback signal 反馈信号ferromagnetic material 铁磁材料field effect transistor ~ 场效应管~field effect transistor(FET) 场效应管field programmable gate array(FPGA) 现场可编程门阵列field programmable logic array(FPLA) 现场可编程逻辑阵列filtering ~ 滤波~filters 滤波电路first-order circuit 一阶电路flash memory 快闪存储器flip-flop 触发器floating-gate avalanche-injection MOSFET(FAMOS) 浮栅雪崩注入MOS管flux leakage 漏磁通flux 磁通forced component 强制分量Forward Euler method 前向欧拉公式Fourier integral 傅里叶积分Fourier series 傅里叶级数Fourier transform 傅里叶变换four-quadrant multiplier 四象限乘法器free electron 自由电子free electron 自由电子free oscillation 自由振荡frequency characteristic 频率特性frequency characteristic(frequency response) 频率特性（频率响应）frequency domain 频域frequency response 频率响应frequency response 频率响应frequency selective ~ 选频~frequency spectrum function 频谱函数frequency 频率frequency-selective network 选频网络full adder 全加器full wave 全波function generator 函数发生器function generator 函数发生器fundamental cut-set matrix 基本割集矩阵fundamental cut-set 基本割集fundamental loop matrix 基本回路矩阵fundamental loop 基本回路fundamental wave 基波Ggain margin 幅值裕度gate circuit 门电路gate 栅极gate 栅极generalized function 广义函数generic array logic(GAL) 通用阵列逻辑generic digital switch(GDS) 通用数字开关generic logic block(GLB) 通用逻辑模块gradually change 渐变graphical method 图解法Gustav Robert Kirchhoff 基尔霍夫HH magnetic field intensity 磁场强度矢量half adder 半加器half wave rectifier 半波整流half wave 半波harmonic analysis 谐波分析harmonic 谐波Hartley feedback 电感反馈式（电感三点式）heat dissipation 散热heat dissipation 散热Henry(H) 亨[利]Hertz 赫[兹]hexadecimal 十六进制high threshold logic(HTL) 高阈值逻辑high-pass filter 高通滤波器high-pass filter(HPF) 高通~high-pass network 高通网络hold time 保持时间hole 空穴hole 空穴hybrid- model 混合“”模型hybrid- model 混合“”模型hybrid parameter equation 混合参数方程hybrid parameter matrix 混合参数矩阵hysteresis loop 磁滞回线Iideal model 理想模型ideal op amp 理想运放ideal operational amplifier 理想运放ideal transformer 理想变压器image function 象函数imaginary part 虚部impedance parameter equation 阻抗参数方程impedance 阻抗impulse response 冲激响应Impurity 杂质Impurity 杂质in phase 同相in system programmable(ISP) 在系统可编程incidence matrix 关联矩阵incidence wave 入射波independent source 独立电源induced EMF 感应电动势inductance 电感[系数]inductive reactance 感抗inductor 电感[元件]infinite gain multiple Feedback filter(LPF) 无限增益多路反馈~ (LPF) infinite gain multiple Feedback 无限增益多路反馈initial current 初始电流initial magnetization curve 起始磁化曲线initial value 初始值initial voltage 初始电压input characteristics(CE) 输入特性（共射）input impedance 输入阻抗input resistance 输入电阻input resistance 输入电阻input/output block(IOB) 输入/输出模块instantaneous power 瞬时功率instantaneous value 瞬时值instrumentation amplifier 仪用放大器insulated gate type ~ 绝缘栅型~ integrated analog multiplier 集成模拟乘法器integrated circuit power amplifier 集成功放integrated circuit 集成电路integrated circuit(IC) 集成电路integrated injection logic(I2L) 集成注入逻辑integrated operational amplifier circuit 集成运算放大电路Integrated voltage comparator 集成电压比较器integrated voltage comparator 集成电压比较器integration circuit 积分~ interconnect resource(IR) 互连资源inter-electrode ~ 极间~ interference 干扰internal resistance 内阻intrinsic semiconductor 本征半导体intrinsic 本征inverse Fourier transform 傅里叶反变换inverse hybrid parameter equation 逆混合参数方程inverse hybrid parameter matrix 逆混合参数矩阵inverse Laplace transform 拉普拉斯逆变换inverse transmission parameter matrix 逆传输参数矩阵inverted T type DAC 倒T形电阻网络数-模转换器inverter 反相器inverting amplifier 反相放大器inverting input terminal 反向输入端inverting input 反相输入iron core 铁心iron core 铁心iron loss 磁滞损耗iron loss 铁损iron-core transformer 铁心变压器isolated amplifier 隔离放大器isolation 隔离JJoule's law 焦耳定律jump phenomena 跳变现象junction capacitance 结电容junction type ~ 结型~junction type ~ 面接触型~KKarnaugh map 卡诺图Kirchhoff's Current Law(KCL) 基尔霍夫电流定律kirchhoff's laws 霍夫定律Kirchhoff's Voltage Law(KVL) 基尔霍夫电压定律knee point 膝点Llag 滞后Laplace transform 拉普拉斯变换large scale integration(LSI) 大规模集成latch 锁存器latch-up 锁定效应law of continuity magnetic flux 磁通的连续性定理law of electromagnetic induction 电磁感应定律LC network LC并联网络lead 越前light emitting diode(LED) 发光二极管light-emitting ~ 发光~line current 线电流linear algebraic equations 线性代数方程linear circuit 线性电路linear DC circuit 线性直流电路linear element 线性元件link branch 连支liquid crystal display(LCD) 液晶显示器load line 负载线load 负载logarithmic circuit 对数~logic algebra 逻辑代数logic diagram 逻辑图logic function 逻辑函数logic level 逻辑电平logic operation 逻辑运算logic 逻辑long tailed pair 长尾电路look-ahead carry adder 超前进位加法器loop analysis 回路分析法loop current analysis 回路电流法loop current 回路电流loop gain 环路增益loop impedance matrix 回路阻抗矩阵loop source-voltage vector 回路电压向量loop 波腹loop 回路loop 回路lossless element 无损元件low frequency power amplifier 低频功率放大电路lower cut-off frequency 下限截止频率low-pass filter 低通滤波器low-pass filter(LPF) 低通~low-pass network 低通网络lumped circuit 集(中)总参数电路lumped 集(中)总Mmagnetic circuit 磁路magnetic coupling 磁耦合magnetic field 磁场magnetic flux density 磁通密度magnetic flux 磁通magnetic hysteresis 磁滞magnetic induction intensity 磁感应强度magnetic permeance 磁导magnetic reluctance 磁阻magnetic saturation 磁饱和magnetically hard materials 硬磁材料magnetically soft materials 软磁材料magnetization curve 磁化曲线magnetomotive force (MMF) 磁通势main flux 主磁通majority carrier 多数载流子Majority carrier 多数载流子masked read-only memory 掩膜只读存储器master-slave flip-flop 主从触发器mathematical power circuit 乘方~maximum output amplitude 最大输出幅值maximum output power 最大输出功率maxterm 最大项medium scale integration(MSI) 中规模集成memory element 记忆元件memory 存储器mesh current 网孔电流mesh 网孔Metal-Oxide-Semiconductor field effect transistor 金属-氧化物-半导体场效应管metal-oxide-semiconductor field-effect transistor(MOSFET) 金属-氧化物-半导体场效应管(MOS管)Miller effect 密勒效应minority carrier 少数载流子Minority carrier 少数载流子minterm 最小项modified node voltage analysis 改进节点电压法modulus 模monolithic integrated regulator 单片集成稳压器Moore type sequential logic circuit 穆尔型时序电路MOS type ~ MOS型~multi-phase system 多相制multiple collector transistor 多集电极晶体管Multiple current source 多路~multiple emitter transistor 多发射级晶体管multiplication circuit 乘法~multiplier 倍增电路multistage amplifier 多级放大电路mutual conductance 互导mutual inductance 互感[系数]mutual induction 互感应mutual inductor 互感[元件]mutual resistance 互阻NN type ~ N型~N type Semiconductors N型半导体NAND gate 与非门NAND 与非natural frequency 固有频率/自然频率natural frequency 自然频率n-channel depletion MOSFET N沟道耗尽型MOS管n-channel enhancement MOSFET N沟道增强型MOS管negative feedback 负反馈negative feedback 负反馈negative resistance 负电阻negative sequence 负序negative total reflection 负全反射Neper (Np) 奈培network function 网络函数neutral point 中性点neutral wire 中线Newton-Raphson’s method 牛顿-拉夫逊法nixie light 数码管node admittance matrix 节点导纳矩阵node analysis 节点分析法node conductance matrix 电导矩阵node source-current vector 节点电流向量node voltage analysis 节点电压法node voltage 节点电压node 波节node 节点node-to-branch incidence matrix 节点-支路关联矩阵noise factor 噪声系数noise margin噪声容限noise 噪声noise(fizker noise) 噪声no-load current 空载电流nonautonomous equation 非自治方程nonautonomous network 非自治网络noninverting amplifier 同相放大器non-inverting input terminal 同相输入端non-inverting input 同相输入nonlinear capacitor 非线性电容nonlinear circuit 非线性电路nonlinear element 非线性元件nonlinear resistor 非线性电阻nonplanar circuit 非平面电路NOR gate 或非门NOR 或非normal magnetization curve 基本磁化曲线Norton 诺顿Norton’s theorem 诺顿定理NOT gate 非门NOT 非numerical analysis 数值分析法Oodd-even check/generator 奇偶校验/发生器offset current 失调电流offset voltage 失调电压Ohm 欧姆one-port network 一个端口网络open circuit 开路/断路open collector gate(OC门) 集电极开路门电路open drain gate(OD门) 漏极开路门电路open loop gain 开环增益open-circuit impedance parameters 开路阻抗参数open-circuit input impedance 开路输入阻抗open-circuit output impedance 开路输出阻抗open-circuit transfer impedance 开路转移阻抗open-loop gain 开环增益open-loop gain 开环增益open-loop 开环operating point stabilization 工作点稳定operational admittance 运算导纳operational amplifier or op amp 运算放大器(运放) operational amplifier 运算放大器operational capacitive reactance 运算容抗operational circuit 运算电路operational circuits 运算电路operational impedance 运算阻抗operational inductive reactance 运算感康OR gate 或门OR 或original function 原函数original value 原始值out-off frequency 截止频率output capacitorless OCL~output characteristics 输出特性（共源）output characteristics(CE) 输出特性（共射）output equation 输出方程output impedance 输出阻抗output logic macro cell(OLMC) 输出逻辑宏单元output power 输出功率output resistance 输出电阻output resistance 输出电阻output transformerless OTL~over damped 过阻尼PP type ~ P型~P type Semiconductors P型半导体parallel connection 并联parallel type 并联式parallel type 并联型parallel-comparator ADC 关联比较型模-数转换器-parameter model 参数模型-parameter model 参数模型parameter 参数parameter 参数parameter 参数parameters 参数pass-band voltage gain 通带电压放大倍数pass-band 通带pass-band 通带passive element 无源元件path 路径p-channel depletion MOSFET P沟道耗尽型MOS管p-channel enhancement MOSFET P沟道增强型MOS管perfectly coupled 全耦合period 周期permeability 磁导率phase angle 相角phase coefficient 相位系数phase current 相电流phase difference 相位差phase frequency characteristic 相频特性phase inversion 反相phase lag compensation 滞后校正phase lead compensation 超前校正phase margin 相位裕度phase quadrature 正交phase sequence 相序phase spectrum 相位频谱phase velocity 相速phase voltage 相电压phase 相phase 相位phase 相位phase-frequency characteristic 相频特性phasor 向量photocell 光电池photocoupler 光电耦合器photocoupler 光电耦合器photodiode 光电二极管photodiode 光电二极管phototransistor 光电三极管piecewise linear approximation 分段性近似法piecewise model 折线化模型pinch off voltage 夹断电压planar circuit 平面电路P-N junction diode P-N 结二极管PN junction PN结point contact type ~ 点接触型~ pole 极点popular type 通用型positive feedback 正反馈positive sequence 正序potential 电位power amplifiers 功率放大电路power factor 功率因数power frequency 工频power system 电力系统power 电功率(功率) precision rectifier 精密整流电路precision rectifier 精密整流电路prediction correction method 预报-校正法primary coil 原线圈principles of getting amplification 组成原则priority encoder 优先编码器programmable array logic(PAL) 可编程阵列逻辑programmable interconnect point(PIP) 可编程连接点programmable logic device(PLD) 可编程逻辑器件programmable logic sequencer(PLS) 可编程逻辑时序器programmable read-only memory(PROM) 可编程只读存储器propagation coefficient 传播系数proper tree 专用树protecting circuit 保护电路protecting circuit 保护电路pulse duration ratio 占空比pulse 脉冲pulse-width modulation(PWM) 脉宽调制push-pull ~ 推挽~push-pull output 推拉式输出Qquality factor Q值quality factor 品质因数quality factor 品质因数quantization error 量化误差quantization 量化quartz crystal 石英晶体quasi complementary(emitter follower) 准互补电路Quiescent point 静态工作点Quiescent point 静态工作点Rrace-hazard 竞争-冒险random access memory(RAM) 随机存储器rated power 额定功率RC coupling ~ 阻容耦合~ reactance 电抗reactance 电抗reactive power compensation 无功补偿read-only memory(ROM) 只读存储器real part 实部reciprocity theorem 互易定理recovery time 恢复时间rectangular wave generator 矩形波发生器rectifier 整流电路reference direction 参考方向reference 基准源reflected impedance 引入阻抗reflected reactance 引入电抗reflected resistance 引入电阻reflection coefficient 反射系数reflective wave 反射波reflectless 无反射Regenerative comparator 滞回比较器register 寄存器relative error 相对误差remain magnetic induction intensity 剩余磁感应强度reset 复位resistance 电阻[系数] resistive circuits 电阻电路resistor 电阻元件resistor-capacitor coupled 阻容耦合resolution 分辨率resonance angular frequency 谐振角频率resonance 谐振response 响应return difference(desensitivity) 反馈深度returning wave 反向行波reverse recovery time 反向恢复时间reverse saturation current 反向饱和电流reverse saturation current 反向饱和电流( ) reverse transmission factor(feedback Factor) 反馈系数ring counter 环形计数器ring multivibrator 环形振荡器ripple factor 脉动系数ripple factor 脉动系数ripple 纹波rise time 上升时间root-mean-square value(RMS) 方均根值rotating factor 旋转因子rotating phasor 旋转向量Ssafety operating area protection 安全区保护sample-hold 取样-保持saturation point 饱和点saturation region 饱和区saturation 饱和sawtooth wave generator 锯齿波发生器scaling circuit 比例~scaling current source 比例~Schmitt trigger 施密特触发器Schottky barrier diode(SDB) 肖特基势垒二极管screen 屏蔽second harmonic 二次谐波secondary coil 副线圈second-order circuit 二阶电路self conductance 自导self excited oscillation of feedback amplifiers 负反馈放大电路的自激振荡self excited oscillation 自激振荡self inductance 自感[系数]self induction 自感应self resistance 自阻self-exited oscillation 自激振荡semiconductor 半导体semiconductors diodes 半导体二极管Semiconductors 半导体sequential logic circuit 时序逻辑电路serial carry adder 串行进位加法器serial type 串联型series connection 串联series resonance 串联谐振series type 串联型series voltage regulator 串联型稳压电路set 置位set-up time 建立时间seven-segment character mode display 七段字符显示器shift register 移位寄存器shifting of the neutral point 中性点的位移short circuit 短路short-circuit admittance parameters 短路导纳参数short-circuit current 短路电流short-circuit input admittance 短路输入导纳short-circuit transfer admittance 短路转移导纳shot noise 散粒噪声signal transfer circuit 信号转换电路signal-noise ratio 信噪比signal-to-noise ratio 信噪比Simens(S) 西[门子] Simple comparator 简单比较器single-phase load 单相负载single-stage amplifier 单级放大电路singular function 奇异函数sinusoidal circuits 正弦电路sinusoidal current 正弦电流sinusoidal oscillator 正弦波振荡电路sinusoidal oscillator 正弦波振荡电路sinusoidal voltage 正弦电压sinusoidal 正弦量slew rate(SR) 转换速率small scale integration(SSI) 小规模集成small signal analysis 小信号分析法small signal model 小信号模型Small value current source 微~source current 源电流source voltage 源电压source 电源source 源极source 源极sparse matrix 稀疏矩阵special type 专用型square wave generator 方波发生器stability criterion 稳定判据stability margin 稳定裕度stability 稳定性stable 稳定stacked-gate injection MOSFET(SIMOS) 叠栅注入MOS管standing wave 驻波state diagram 状态(转换)图state equation 状态方程state plane 状态平面state table 状态(转换)表state trajectory 状态轨迹state variable filter 状态变量~state variable 状态变量state vector 状态向量static random access memory(SRAM) 静态随机存储器static resistance 静态电阻steady state component 稳态分量steady state 稳态step response 阶跃响应stop-band 阻带stop-band 阻带strength of impulse 冲击强度subgraph 子图substitution theorem 置换定理substrate 衬底successive approximation ADC 逐次渐进型模-数转换器sudden change 跃变summer 加法器summing circuit 求和~ superposition theorem 叠加定理susceptance 电纳switch tree type DAC 开关树型数-模转换器switching capacity filter 开关电容~ switching characteristic 开关特性switching matrices 开关矩阵switching mode direct power supply 开关型直流电源symbol 符号symmetric three-phase voltage 对称三相电压symmetrical 对称synchronous counter 同步计数器system 系统TTellegen’s Theorem 特勒根定理temperature effect 温度影响terminal wire 端线terminal 端子Tesla (T) 特斯拉the feedback concept 反馈概念thermal noise 热噪声thermal overload protection 过热保护thermal resistance 热阻thermistor 热敏电阻Thevenin 戴维南Thevenin’s theorem 戴维南定理three state comparator 三态比较器three state output gate 三态输出门three-phase circuit 三相电路three-phase load 三相负载three-phase system 三相制three-phase voltage 三相电压threshold voltage 开启电压threshold voltage 开启电压（值）threshold voltage 阈值电压Threshold voltage 阈值电压thyristor 晶闸管time constant 时间常数time delay line 延迟线time domain analysis 时域分析法time-invariant 非时变timer 定时器time-varying 时变tolerance 容许误差total reflection 全反射totem-pole 图腾柱transfer characteristics 转移特性transfer coefficient 传输参数transfer function 转移函数/传递函数transformation ratio 变比transformer coupled ~ 变压器耦合~ transformer coupled 变压器耦合transformer coupling ~ 变压器耦合~ transformer feedback 变压器反馈式transient response 瞬态响应transient state 暂态transistor 三极管transistor-transistor logic(TTL) 三极管-三极管逻辑transition band 过渡带transition frequency 特征频率transmission parameter equation 传输参数方程transmission parameter matrix 传输参数矩阵transmission parameters 传输参数trapezoidal method 梯形法tree branch 树枝tree 树triangular wave generator 三角波发生器truth table 真值表turns ratio 杂书比two-port network 二端口网络types of filter ~的种类Uultraviolet erasable programmableROM(UVPROM) 紫外线擦除的可编程ROM unconnected graph 非连通图under damped 欠阻尼uniform transmission line 均匀传输线unijunction transistor 单结晶体管unit impulse function 单位冲激函数unit impulse response 单位冲激响应unit step characteristic 单位阶跃特性unit step function 单位阶跃函数unoscillaion 费震荡unstable 不稳定up-down counter 加/减计数器upper cut-off frequency 上限截止频率VVan de Pol 范得坡variable resistance region 可变电阻区variable transconductance multiplier 变跨导VCCS 电压控制电流源VCVS 电压控制电压源vector of loop current 回路电流向量vector of node voltage 节点电压向量very large scale integration(VLSI) 超大规模集成V-gate MOS field effect transistor VMOS管virtual ground 虚地virtual open circuit 虚断virtual open circuit 虚断virtual short circuit 虚短virtual short circuit 虚短Volt Ampere characteristics 伏安特性Volt Ampere characteristics 伏安特性Volt Ampere characteristics 伏安特性volt(V) 伏特Voltage comparators 电压比较电路voltage controlled nonlinear resistor [电]压控[制]非线性电阻voltage controlled oscillator 压控振荡器voltage controlled oscillator(VCO) 压控振荡器voltage divider 分压器voltage division 分压voltage doubler 倍压整流voltage drop 电压降Voltage Feedback Operational Amplifier 电压反馈集成运放voltage follower 电压跟随器voltage follower 电压跟随器voltage resonance 电压谐振voltage rise 电压升voltage source 电压源voltage(tension) 电压voltage-controlled voltage-source filter 压控电压源~voltage-current converter 电压电流转换电路Voltage-equivalent of temperature 温度电压当量voltage-frequency converter 电压频率转换电路voltage-parallel 电压并联voltage-series 电压串联Wwafer 晶片watt(W) 瓦特wave front 波前wave impedance 波阻抗wave length 波长wave velocity 波速wave 波waveform converter 波形转换电路waveform generator 波形发生电路waveform 时序(波形)图Weber (Wb) 韦伯Weber(Wb) 韦[伯]weighted capacitive DAC 权电容数-模转换器weighted resistance DAC 权电阻数-模转换器Wien bridge network RC串并联网络Wien bridge oscillator RC桥式（文氏桥）振荡器Wilson current source 威尔逊电流源Window comparator 窗口比较器with strong negative feedback 深度负反馈电路with T type feedback network T型反馈网络word 字YY-parameter matrix Y参数矩阵ZZener breakdown 齐纳击穿Zener diode 稳压管Zener reference 齐纳基准源Zener voltage regulator 稳压管稳压电路zero drift 零点漂移zero sequence 零序Zero-crossing comparator 过零比较器zero-input response 零输入响应zero-state response 零状态响应Z-parameter matrix Z参数矩阵。

通信工程专业英语汉英对照(A-D)A安全地线=safe ground wire安全特性 security feature安装线=hook-up wire按半周进行的多周期控制=multicycle controlled by half-cycle 按键电话机=push-button telephone set按需分配多地址=demand assignment multiple access(DAMA)按要求的电信业务=demand telecommunication service按组编码=encode by groupB八木天线=Yagi antenna白噪声=white Gaussian noise白噪声发生器=white noise generator半波偶极子=halfwave dipole半导体存储器=semiconductor memory半导体集成电路=semiconductor integrated circuit半双工操作=semi-duplex operation半字节=Nib包络负反馈=peak envelop negative feed-back包络延时失真=envelop delay distortion薄膜=thin film薄膜混合集成电路=thin film hybrid integrated circuit保护比（射频）=protection ratio (RF)保护时段=guard period保密通信=secure communication报头=header报文分组 packet报文优先等级=message priority报讯=alarm备用工作方式 spare mode背景躁声 background noise倍频 frequency multiplication倍频程 actave倍频程滤波器 octave filter被呼地址修改通知 called address modified notification被呼用户优先 priority for called subscriber本地PLMN local PLMN本地交换机 local exchange本地移动用户身份 local mobile station identity ( LMSI)本地震荡器 local oscillator比功率(功率密度) specific power比特 bit比特并行 bit parallel比特号码 bit number (BN)比特流 bit stream比特率 bit rate比特误码率 bit error rate比特序列独立性 bit sequence independence必要带宽 necessary bandwidth闭环电压增益 closed loop voltage gain闭环控制 closed loop control闭路电压 closed circuit voltage边瓣抑制 side lobe suppression边带 sideband边带非线性串扰 sideband non-linear crosstalk边带线性串扰 sideband linear crosstalk边带抑制度 sideband suppression边角辐射 boundary radiation编号制度 numbering plan编解码器 codec编码 encode编码律 encoding law编码器 encoder编码器输出 encoder output编码器总工作时间 encoder overall operate time编码效率 coding efficiency编码信号 coded signal编码约束长度 encoding constraint length编码增益 coding gain编译程序 compiler鞭状天线 whip antenna变频器 converter变频损耗 converter conversion loss变容二极管 variable capacitance diode变形交替传号反转 modified alternate mark inversion便携电台 portable station便携设备 portable equipment便携式载体设备 portable vehicle equipment标称调整率（标称塞入率） nominal justification rate (nominal stuffing rate)标称值 nominal value标称呼通概率 nominal calling probability标准码实验信号 standard code test signal (SCTS)标准模拟天线 standard artificial antenna标准频率 standard frequency标准时间信号发射 standard-time-signal emission标准实验调制 standard test modulation标准输出功率 standard power output标准输入信号 standard input signal标准输入信号电平 standard input-signal level标准输入信号频率 standard input-signal frequency标准信躁比 standard signal to noise表面安装 surface mounting表示层 presentation layer并串变换器 parallel-serial converter (serializer)并馈垂直天线 shunt-fed vertical antenna并行传输 parallel transmission并行终端 parallel terminal拨号错误概率 dialing mistake probability拨号后延迟 post-dialing delay拨号交换机 dial exchange拨号线路 dial-up line拨号音 dialing tone拨号终端 dial-up terminal波动强度（在给定方向上的） cymomotive force (c. m. f)波段覆盖 wave coverage波峰焊 wave soldering波特 baud泊送过程 Poisson process补充业务 supplementary service (of GSM)补充业务登记 supplementary service registration补充业务询问 supplementary service interrogation补充业务互连 supplementary service interworking捕捉区（一个地面接收台） capture area (of a terrestrial receiving station) 捕捉带 pull-in range捕捉带宽 pull-in banwidth捕捉时间 pull-in time不连续发送 discontinuous transmission (DTX)不连续干扰 discontinuous interference不连续接收 discontinuous reception (DRX)不确定度 uncertainty步谈机 portable mobile stationC采样定理 sampling theorem采样频率 sampling frequency采样周期 sampling period参考边带功率 reference side band power参考差错率 reference error ratio参考当量 reference equivalent参考点 reference point参考结构 reference configuration参考可用场强 reference usable fiend-strength参考灵敏度 reference sensibility参考频率 reference frequency参考时钟 reference clock参考输出功率 reference output power残余边带调制 vestigial sideband modulation残余边带发射 vestigial-sideband emission操作维护中心 operation maintenance center (OMC)操作系统 operation system (OS)侧音消耗 sidetone loss层2转发 layer 2 relay (L2R)插入组装 through hole pachnology插入损耗 insertion loss查号台 information desk差错控制编码 error control coding差错漏检率 residual error rate差分脉冲编码调制（差分脉码调制） differential pulse code modulation (DPCM)差分四相相移键控 differential quadrature phase keying (DQPSK)差分相移键控 differential phase keying (DPSK)差模电压，平衡电压 differential mode voltage, symmetrical voltage 差拍干扰 beat jamming差频失真 difference frequency distortion长期抖动指示器 long-term flicker indicator长期频率稳定度 long-term frequency stability场强灵敏度 field intensity sensibility场效应晶体管 field effect transistor (FET)超长波通信 myriametric wave communication超地平对流层传播 transhorizon tropospheric超地平无线接力系统 transhorizon radio-relay system超高帧 hyperframe超帧 superframe超大规模集成电路 very-large scale integrated circuit (VLSI)超再生接收机 super-regenerator receiver车载电台 vehicle station撤消 withdrawal成对不等性码（交替码、交变码）paired-disparity code (alternative code, alternating code)承载业务 bearer service城市交通管制系统 urban traffic control system程序设计技术 programming technique程序设计环境 programming environment程序优化 program optimization程序指令 program command充电 charge充电率 charge rate充电效率 charge efficiency充电终止电压 end-of charge voltage抽样 sampling抽样率 sample rate初级分布线路 primary distribution link初始化 initialization处理增益 processing gain传播时延 propagation delay传播系数 propagation coefficient传导干扰 conducted interference传导杂散发射 conducted spurious emission传递函数 transfer function传递时间 transfer time传声器 microphone传输保密 transmission security传输层协议 transport layer protocol传输集群 transmission trunking传输结束字符 end of transmission character传输媒体 transmission medium传输损耗 transmission loss传输损耗（无线线路的） transmission loss (of a radio link)传输通道 transmission path传输信道 transmission channel传真 facsimile, FAX船舶地球站 ship earth station船舶电台 ship station船舶移动业务 ship movement service船上通信电台 on-board communication station ,ship communication station 船用收音机 ship radio串并变换机 serial to parallel (deserializer)串并行变换 serial-parallel conversion串话 crosstalk垂直方向性图 vertical directivity pattern唇式传声器 lip microphone磁屏蔽 magnetic shielding次级分布线路 secondary distribution link猝发差错 burst error猝发点火控制 burst firing control存储程序控制交换机 stored program controlled switching systemD大规模集成电路 large scale integrated circuit (LSI)大信号信躁比 signal-to-noise ratio of strong signal带成功结果的常规操作 normal operation with successful outcome带宽 bandwidth带内导频单边带 pilot tone-in-band single sideband带内谐波 in-band harmonic带内信令 in-band signalling带内躁声 in-band noise带通滤波器 band-pass filter带外发射 out-of-band emission带外功率 out-of-band power带外衰减 attenuation outside a channel带外信令 out-band signalling带状线 stripline单边带发射 single sideband (SSB) emission单边带发射机 single side-band (SSB) transmitter单边带调制 single side band modulation单边带解调 single side band demodulation单边带信号发生器 single side band signal generaltor单端同步 single-ended synchronization单工、双半工 simplex, halfduplex单工操作 simplex operation单工无线电话机 simplex radio telephone单呼 single call单频双工 single frequency duplex单频信令 single frequency signalling单相对称控制 symmetrical control (single phase)单相非对称控制 asymmetrical control (single phase)单向 one-way单向的 unidirectional单向控制 unidirectional control单信道地面和机载无线电分系统 SINCGARS单信道无绳电话机 single channel cordless telephone单信号方法 single-signal method单音 tone单音脉冲 tone pulse单音脉冲持续时间 tone pulse duration单音脉冲的单音频率 tone frequency of tone pulse单音脉冲上升时间 tone pulse rise time单音脉冲下降时间 tone pulse decay time单音制 individual tone system单元电缆段（中继段） elementary cable section (repeater section)单元再生段 elementary regenerator section (regenerator section)单元增音段，单元中继段 elementary repeater section当被呼移动用户不回答时的呼叫转移 call forwarding on no reply (CFNRy) 当被呼移动用户忙时的呼叫转 calling forwarding on mobile subscriber busy (CFB)当漫游到原籍PLMN国家以外时禁止所有入呼 barring of incoming calls when roaming outside the home PLMN country (BIC-Roam)当前服务的基站 current serving BS当无线信道拥挤时的呼叫转移calling forward on mobile subscriber not reachable (CENRc)刀型天线 blade antenna导频 pilot frequency导频跌落pilot fall down倒L型天线 inverted-L antenna等步的 isochronous等幅电报 continuous wave telegraph等权网（互同步网） democratic network (mutually synchronized network) 等效比特率 equivalent bit rate等效地球半径 equivalent earth radius等效二进制数 equivalent binary content等效全向辐射功率 equivalent isotropically radiated power (e. i. r. p.) 等效卫星线路躁声温度 equivalent satellite link noise temperature低轨道卫星系统 LEO satellite mobile communication system低气压实验 low atmospheric pressure test低时延码激励线性预测编码 low delay CELP (LD-CELP)低通滤波器 low pass filter低温实验 low temperature test低躁声放大器 low noise amplifier地-空路径传播 earth-space path propagation地-空通信设备 ground/air communication equipment地波 ground wave地面连线用户 land line subscriber地面无线电通信 terrestrial radio communication地面站（电台） terrestrial station第N次谐波比 nth harmonic ratio第二代无绳电话系统 cordless telephone system second generation (CT-2) 第三代移动通信系统 third generation mobile systems点波束天线 spot beam antenna点对地区通信 point-area communication点对点通信 point-point communication点至点的GSM PLMN连接 point to point GSM PLMN电报 telegraphy电报电码 telegraph code电波衰落 radio wave fading电池功率 power of battery电池能量 energy capacity of battery电池容量 battery capacity电池组 battery电磁波 electromagnetic wave电磁波反射 reflection of electromagnetic wave电磁波饶射 diffraction of electromagnetic wave电磁波散射 scattering of electromagnetic wave电磁波色射 dispersion of electromagnetic wave电磁波吸收 absorption of electromagnetic wave电磁波折射 refraction of electromagnetic wave电磁场 electromagnetic field电磁发射 electromagnetic field电磁辐射 electromagnetic emission电磁干扰 electromagnetic interference (EMI)电磁感应 electromagnetic induction电磁环境 electromagnetic environment电磁兼容性 electromagnetic compatibility (EMC)电磁兼容性电平 electromagnetic compatibility level 电磁兼容性余量 electromagnetic compatibility margin 电磁脉冲 electromagnetic pulse (EMP)电磁脉冲干扰 electromagnetic pulse jamming电磁敏感度 electromagnetic susceptibility电磁能 electromagnetic energy电磁耦合 electromagnetic coupling电磁屏蔽 electromagnetic shielding电磁屏蔽装置 electromagnetic screen电磁骚扰 electromagnetic disturbance电磁噪声 electromagnetic noise电磁污染 electromagnetic pollution电动势 electromotive force (e. m. f.)电话机 telephone set电话局容量 capacity of telephone exchange电话型电路 telephone-type circuit电话型信道 telephone-type channel电离层 ionosphere电离层波 ionosphere wave电离层传播 ionosphere propagation电离层反射 ionosphere reflection电离层反射传播 ionosphere reflection propagation电离层散射传播 ionosphere scatter propagation电离层折射 ionosphere refraction电离层吸收 ionosphere absorption电离层骚扰 ionosphere disturbance电流探头 current probe电路交换 circuit switching电屏蔽 electric shielding电视电话 video-telephone, viewphone, visual telephone电台磁方位 magnetic bearing of station电台方位 bearing of station电台航向 heading of station电文编号 message numbering电文队列 message queue电文格式 message format电文交换 message switching电文交换网络 message switching network电文结束代码 end-of-message code电文路由选择 message routing电小天线 electronically small antenna电信管理网络 telecommunication management network (TMN)电信会议 teleconferencing电压变化 voltage change电压变化持续时间 duration of a voltage change电压变化的发生率 rate of occurrence of voltage changes电压变化时间间隔 voltage change interval电压波动 voltage fluctuation电压波动波形 voltage fluctuation waveform电压波动量 magnitude of a voltage fluctuation电压不平衡 voltage imbalance, voltage unbalance电压浪涌 voltage surge电压骤降 voltage dip电源 power supply电源电压调整率 line regulation电源抗扰性 mains immunity电源持续工作能力 continuous operation ability of the power supply 电源去耦系数 mains decoupling factor电源骚扰 mains disturbance电子干扰 electronic jamming电子工业协会 Electronic Industries Association (EIA)电子系统工程 electronic system engineering电子自动调谐 electronic automatic tuning电子组装 electronic packaging电阻温度计 resistance thermometer跌落试验 fall down test顶部加载垂直天线 top-loaded vertical antenna定长编码 block code定期频率预报 periodical frequency forecast定时 clocking定时超前 timing advance定时电路 timing circuit定时恢复（定时抽取） timing recovery (timing extration)定时截尾试验 fixed time test定时信号 timing signal定数截尾试验 fixed failure number test定向天线 directional antenna定型试验 type test动态频率分配 dynamic frequency allocation动态信道分配 dynamic channel allocation动态重组 dynamic regrouping动态自动增益控制特性 dynamic AGC characteristic抖动 jitter独立边带 independent sideband独立故障 independent fault端到端业务 teleservice短波传播 short wave propagation短波通信 short wave communication短路保护 short-circuit protection短期抖动指示器 short-term flicker indicator短期频率稳定度 short-term frequency stability短时间中断（供电电压） short interruption (of supply voltage)段终端 section termination对称二元码 symmetrical binary code对地静止卫星 geostationary satellite对地静止卫星轨道 geostationary satellite orbit对地同步卫星 geosynchronous satellite对讲电话机 intercommunicating telephone set对空台 aeronautical station对流层 troposphere对流层波道 troposphere duct对流层传播 troposphere propagation对流层散射传播 troposphere scatter propagation多次调制 multiple modulation多点接入 multipoint access多电平正交调幅 multi-level quadrature amplitude modulation (QAM) 多分转站网 multidrop network多服务器队列 multiserver queue多工 multiplexing多工器 nultiplexer多功能系统 MRS多级处理 multilevel processing多级互连网络 multistage interconnecting network多级卫星线路 multi-satellite link多径 multipath多径传播 multipath propagation多径传播函数 nultipath propagation function多径分集 multipath diversity多径时延 multipath delay多径衰落 multipath fading多径效应 multipath effect多路复接 multiplexing多路接入 multiple access多路信道 multiplexor channel多脉冲线性预测编码 multi-pulse LPC (MPLC)多频信令 multifrequency signalling多普勒频移 Doppler shift多跳路径 multihop path多信道选取 multichannel access (MCA)多信道自动拨号移动通信系统multiple-channel mobile communication system with automatic dialing 多优先级 multiple priority levels多帧 multiframe多址呼叫 multiaddress call多址联接 multiple access多重时帧 multiple timeframe多用户信道 multi-user channel通信工程专业英语汉英对照(E-H)2008年11月14日星期五 21:09E额定带宽 rated bandwidth额定射频输出功率 rated radio frequency output power额定使用范围 rated operating range额定音频输出功率 rated audio-frequency output power额定值 rated value爱尔兰 erlang恶意呼叫识别 malicious call identification (MCI)耳机（受话器） earphone耳机额定阻抗 rated impedance of earphone二十进制码 binary-coded decimal (BCD) code二十进制转换 binary-to-decimal conversion二十六进制转换 binary-to-hexadecimal conversion二进制码 binary code二进制频移键控 binary frequency shift keying (BFSK)二进制数 binary figure二频制位 binary digit(bit)二频制 two-frequency system二维奇偶验码 horizontal and vertical parity check code二线制 two-wire system二相差分相移键控 binary different phase shift keying (BDPSK) 二相相移键控 binary phase shift keying (BPSK)F发报机 telegraph transmitter发射 emisssion发射（或信号）带宽 bandwidth of an emission (or a signal)发射机 transmitter发射机边带频谱 transmitter sideband spectrum发射机额定输出功率 rated output power of transmitter发射机合路器 transmitter combiner发射机冷却系统 cooling system of transmitter发射机启动时间 transmitter attack time发射机效率 transmitter frequency发射机杂散躁声 spurious transmitter noise发射机之间的互调 iner-transmitter intermodulation发射机对答允许频（相）偏transmitter maximum permissible frequency(phase) deviation 发射类别 class of emission发射频段 transmit frequency band发射余量 emission margin发送 sending发送响度评定值 send loudness rating (SLR)繁忙排队/自动回叫 busy queuing/ callback反馈控制系统 feedback control system反射功率 reflection power反射卫星 reflection satellite反向话音通道 reverse voice channel (RVC)反向控制信道 reverse control channel (RECC)泛欧数字无绳电话系统 digital European cordless telephone方舱 shelter方向性系数 directivity of an antenna防爆电话机 explosion-proof telephone set防潮 moisture protection防腐蚀 corrosion protection防霉 mould proof仿真头 artificial head仿真耳 artificial ear仿真嘴 artificial mouth仿真天线 dummy antenna放大器 amplifier放大器线性动态范围 linear dynamic range of amplifier放电 discharge放电电压 discharge voltage放电深度 depth of discharge放电率 discharge rate放电特性曲线 discharge character curve非等步的 anisochronous非归零码 nonreturn to zero code (NRZ)非均匀编码 nonuniform encoding非均匀量化 nonuniform quantizing非连续干扰 discontinuous disturbance“非”门 NOT gate非强占优先规则 non-preemptive priority queuing discipline非受控滑动 uncontrolled slip非线性电路 nonlinear circuit非线性失真 nonliear distortion非线性数字调制 nonlinear digital modulation非占空呼叫建立 off-air-call-set-up (OACSU)非专用控制信道 non-dedicated control channel非阻塞互连网络 non-blocking interconnection network分贝 decibel (dB)分辨力 resolution分布参数网络 distributed parameter network分布式功能 distributed function分布式数据库 distributed database分别于是微波通信系统 distributed microwave communication system分布式移动通信系统 distributed mobile communication system分布路线 distribution link分段加载天线 sectional loaded antenna分机 extension分集 diversity分集改善系数 diversity improvement factor分集间隔 diversity separation分集增益 diversity gain分集接收 diversity reception分接器 demultiplexer分频 frequency division分散定位 distributed channel assignment分散控制方式 decentralized control分散式帧定位信号 distributed frame alignment signal分同步（超同步）卫星 sub-synchronous (super-synchronous) satellite 分谐波 subharmonic分组交换 packet switching分组码 block code分组无线网 packet radio network分组循环分散定位 block cyclic distributed channel assigment分组组装与拆卸 packet assembly and disassembly封闭用户群 closed user group (CUG)峰包功率 peak envelop power峰值 peak value峰值-波纹系数 peak-ripple factor峰值包络检波 peak envelop detection峰值功率 peak power峰值功率等级（移动台的） peak power class (of MS)峰值检波器 peak detector峰值限制 peak limiting蜂窝手持机 cellular handset蜂窝系统 cellular system缝隙天线 slot antenna服务基站 serving BS服务访问点 service access point (SAP)服务弧 service arc服务可保持性 service retainability服务可得到性 service accessibility服务提供部门 service provider服务完善性 service integrity服务小区 serving cell服务易行性 service operability服务支持性 service supportability服务质量 quality of service服务准备时间 service provisioning time符号率 symbol rate幅度检波 amplitude detection幅度量化控制 amplitude quantized cntrol幅度失真 amplitude distortion幅度调制 amplitude modulation (AM)幅频响应 amplitude-frequency response幅相键控 amplitude phase keying (APK)辐射 radiation辐射单元 radiating element辐射方向图 radiation pattern辐射干扰 radiated interference辐射近场区 radiating near-field region辐射能 radiant energy辐射强度 radiation intensity辐射区 radiated area辐射实验场地 radiation test site辐射效率 radiation efficiency辐射源（电磁干扰） emitter (of electromagnetic disturbance) 辐射杂散发射 radiated spurious emission辐射阻抗 radiation impedance俯仰角 pitch angle负极 negative electrode负离子 negative ion负荷容量（过荷点） load capacity (overload point)负逻辑 negative logic负码速调整（负脉冲塞入） negative justification (negative pulse stuffing) 负载调整率 load regulation负阻放大器 negative resistance amplifier负阻效应 negative resistance effect负阻振荡 negative resistance oscillation附加符号 additional character附加位 overhead bit复合音 complex sound复接器 multiplexer复节-分接器 muldex复接制 multiple connection system复位 reset复用转接器 transmultiplexer复帧 multiframe副瓣 minor lobe副瓣电平 minor level覆盖区（一个地面发射台的） coverage area (of a terrestrial transmitting station)G概率 probability概率分布 probability distribution概率信息 probabilistic information概率译码 probabilistic decoding干扰 interference干扰参数 interference parameter干扰限值 limit of interference干扰信号 interfering signal干扰抑制 interfering suppression干扰源 interfering resource干线 trunk line感应近场区 reactive near-field region港口操作业务 port operation service港口电台 port station港口管理系统 harbor management system港口交通管理系统 harbor traffic control system高[低]电平输出电流 high (low)-level output current高[低]电平输出电压 high (low)-level output voltage高波 high-angle ray高层功能 high layer function高层协议 high layer protocol高级数据链路控制规程 high level data link control (HDLC) procedure高级通信业务 advanced communication service高级研究计划署 Advanced Research Projects Agency (ARPA)高级移动电话系统 Advanced Mobile Phone System (AMPS)高频放大器 high frequency amplifier高频提升 high frequency boost高频增益控制 high frequency gain control高斯信道 Gauss channel (AWG)高斯最小频移键控 Guassian minimum shift keying (GMSK)高频制频率时的发射频偏 transmitting frequency deviation of high frequency高通滤波器 highpass filter高温高湿偏置试验 high temperature high humidity biased testing (HHBT) 高温功率老化 burning高温试验 high temperature test告警接收机 warning receiver告警指示信号 alarm indication signal (AIS)戈莱码 Golay code戈帕码 Goppa codes格码调制 trellis codes modulation schemes (TCM)隔离放大器 isolation amplifier个人数字助理 personal digital assistant (PDA)个人电台 personal station (PS)个人电台系统 personal radio system个人识别号码 personal identification number (PIN)个人通信 personal communications个人通信网 personal communication networks (PCN)个人携带电话 personal handy phone (PHP)个人移动性 personal mobility个体接收（在卫星广播业务中） individual reception跟踪保持电路 track and hold circuit跟踪带宽 tracking bandwidth更改地址插入 changed address interception工科医用（的） ISM工科医用频段 ISM frequency band工业干扰 industrial interference工作最高可用频率 operational MUF工作比 duty cycle工作范围 working range工作频率范围 operating frequency range工作站 work station (WS)工作周期 cycle of operation公共分组交换网 public packet switched network公共耦合点 point of common coupling (PCC)公开密匙体制 public key system公路交通管制系统 highway traffic control system公用数据网 public data network公众陆地移动电话网 public land mobile network (PLMN)功能键 function key功能群，功能群令 function group, function grouping功率合成 power synthesis功能控制报文 power control message功率控制电平 power control level功率谱密度 power spectrum density功率损耗 power loss功率因子 power factor供电系统阻抗 supply system impedance共道抑制 co-channel suppression共道信令 co-channel signalling共模电压，不平衡电压 common mode voltage, asymmetrical voltage 共模电流 common mode current共模转换 common code conversion共模干扰 common code interference共模抑制比 common code rejection ratio (CMRR)共模增益 common mode gain共模阻抗 common code impedance共信道再用距离 co-channel re-use distance贡献路线 contribution link固定电台 fixed station固定基地电台 fixed base station固定信道指配 fixed channel assignment固态发射机 solidstate transmitter固有可靠性 inherent reliability固有频差 inherent frequency error故障 fault故障安全 fault safe故障保护 fault protection故障弱化 failsoft故障修复 fault correcting故障原因 fault cause故障准则 fault criteria挂机信号 hang-up signal管理中心 administration center (ADC)广播控制信道（BCCH）划分 BCCH allocation (BA)广播寻呼系统 broadcast paging system广域网 wide area network (WAN)归零码 return to zero code (RZ)归一化的偏置 normalized offset规程 protocol规范 specification规则脉冲激励编码 regular-pulse excitation (RPE)规则脉冲激励长时预测编码 regular-pulse excitation LPC (RPE-LPC)轨道 orbit国际标准 international standard国际单位制 international system of units国际电报电话咨询委员会 CCITT国际电工委员会 IEC国际电信联盟 ITU国际互连网 Internet国际民航组织 ICAO , international civil aviation organization国际通信卫星组织 INTERAT国际海事卫星组织 INMAR-SAT国际无线电干扰特别委员会 CISPR国际无线电干扰委员会 CCIR国际移动识别码 international mobile station equipment identity (IMEI) 国际移动用户识别码 international mobile subscriber identity (IMSI)国际原子时间 international automatic time (TAI)国家标准 national standard国家信息基础结构 national information infrastructure (NII)过充电 overcharge过滤带 transition band过放电 overdischarge过荷保护电路 overload protecting circuit过荷分级控制 overload control category过荷控制 overload control过调制 overmodulation过流保护 overcurrent protection过压保护 overvoltage protectionH海岸地球站 coast earth station海岸电台 coast station海事卫星通信 maritime satellite communications汉明距离 Hamming distance汉明码 Hamming code汉明重量 Hamming weight航空地球站 aeronautical earth station航空电台 aeronautical station航空器地球站 aircraft earth station航空器电台 aircraft station航空移动业务 aeronautical mobile service航天器（宇宙飞船） spacecraft毫米波 millimeter wave黑格巴哥码 Hagelbarger code恒比码 constant ratio code恒步的 homochronous恒流电源 constant current power supply恒温恒湿试验 constant temperature and humid test恒压充电 constant voltage charge恒压电源 constant voltage power supply恒电磁波小室 transverse electromagnetic wave cell (TEM cell)喉式传声器 throat microphone后瓣 back hole厚模电路 thick-film circuit呼叫 call呼叫支持 call hold (HOLD)呼叫存储 call store呼叫等待 call waiting (CW)呼叫改发 call redirection呼叫建立 call establishment呼叫建立时间 call set-up time呼叫接通率 percept of call completed呼叫控制信号 call control signal呼叫清除延时 call clearing delay呼叫释放 call release呼叫序列 calling sequence呼叫转移 call transfer (CT)呼救 distress call呼救系统 distress system呼损率 percept of call lost呼通概率 calling probability互补金属氧化物半导体集成电路complementary MOS integrated circuit (COMOS-IC)互连 interworking互连的考虑 interworking consideration互连功能 interworking function (IWF)互调 intermodulation互调产物（一个发射台的） intermodulation products (of a transmitting stastion)互调抗扰性 intermodulation immunity互调失真 intermodulation distortion互通性 interoperability互同步网 mutually synchronized network话路输入电平 voice circuit input level话路输入电平差异 voice circuit input level difference话务量 telephone traffic话音活动检测 voice activity detection (VAD)话音激活 voice exciting话音激活率 speech activity话音数字信令 speech digit signalling话音突发 speech spurt环境试验 environment test环境系数 environment factor环境应力筛选 environment stress screening (ESS)环境躁声 ambient noise环路传输 loop transmission环路高频总增益 loop RF overall gain环路可锁定最底（最高）界限角频率loop lockable minimum (maximum) margin angular frequency 环路滤波器比例系数 loop filter proportion coefficient环路躁声带宽 loop noise bandwidth环路增益 loop gain环路直流总增益 loop DC overall gain环路自然谐振角频率 loop natural resonant angular frequency 环形波 ring wave环形混频器 ring mixer环行器 circulator环行延迟 rounding relay恢复 recovery恢复规程 restoration procedure汇接交换 tandem switching汇接局 tandem office会话（在电信中） conversation (in telecommunication)会话层 session layer会议电话 conference telephone混合ARQ hybrid ARQ混合差错控制 hybrid error control (HEC)混合分集 hybrid diversity混合集成电路 hybrid integrated circuit混合扩频 hybrid spread spectrum混合路径传播 mixed-path propagation混合信道指配 hybrid channel assignment混频器 mixer混频器的寄生响应 mixer spurious response活动模式 active mode“或”门 OR gate“或非”门 NOR gate通信工程专业英语汉英对照(I-L)2008年11月14日星期五 21:11J机壳辐射 cabinet radiation机载电台 aircraft station基本传输损耗（无线线路的） basic transmission loss (of a radio link) 基本接入 basic access基本业务（GSM的） basic service (of GSM)基本越区切换规程 basic handover procedure基本最高可用频率 basic maximun usable frequency基波（分量） fundamental (component)基波系数 fundamental factor基带 baseband基地（海岸）（航空）设备 base (coast)(aeronautical) equipment基地电台 base station (BS)基站控制器 base station controller (BSC)基站识别码 base station identity code (BSIC)基站收发信台 base transceiver station (BTS)基站系统 base station system (BSS)基站区 base station area基准条件 reference condition基准阻抗 reference impedance奇偶校验码 parity check code奇偶校验位 parity bit激活 activation吉尔伯特码 Gilbert code级联码 concatenated code即时业务 demand service急充电 boost charge急剧衰落 flutter fading集成电路 integrated circuit集成电路卡 integrated circuit card集群电话互连 trunked telephone connect集群电话互连器 trunked telephone connector集群基站 trunked base station集群效率 trunking efficiency集群移动电话系统 trunked mobile communication system集体呼叫 group call集体接收（在卫星广播业务中） community reception集中控制方式 centralized control集中式帧定位信号 bunched frame alignment signal计费信息 advice of charge。

中文2800字毕业设计英文翻译专业电子信息工程班级2010级学生姓名学号课题码分多址通信系统的建模、仿真和设计——初始化模块、基站接收模块指导教师2014 年06 月10 日译文原文1.1 The basic concept of spread-spectrum communicationSpread spectrum communication’s basic characteristics, is used to transmit information to the signal bandwidth(W) is far greater than practical required minimum(effective) bandwidth (F∆),as the radio of processing gain P G.=/G P∆FWAs we well know,the ordinary AM,FM,or pulse code modulation,GP value in the area more than 10 times,collectively,the “narrow-band communication”,and spread-spectrum communication GP values as hundred or even thousands of times, can be called “broadband communication”.Due to the spread-spectrum signal,it is very low power transmitters,transmission space mostly drowned in the noise,it is difficult to intercepted by the other receiver ,only spreading codes with the same (or random PN code) receiver, Gain can be dealt with ,and despreading resume the original signal.1.2 The technology superiority of spread-spectrum communication.Strong anti-interference, bit error rate is low. As noted above, the spread spectrum communication system due to the expansion of the transmitter signal spectrum, the receiver despreading reduction signal produced spreading gain, thereby greatly enhancing its interference tolerance. Under the spreading gain, or even negative in the signal-to-noise ratio conditions, can also signal from the noise drowned out Extraction, in the current business communications systems, spread spectrum communications systems, spread spectrum communication is only able to work in a negative signal-to-noise ratio under the conditions of communication .Anti-multi-path interference capability, increase the reliability of system. Spread-spectrum systems as used in the PN has a good correlation, correlation is very weak. Different paths to the transmission signal can easily be separated and may intime and re-alignment phase, formation of several superimposed signal power, thereby improving the system’s performance to receive increased reliability of the system.Easy to use the same frequency, improving the wireless spectrum utilization. Wireless spectrum is very valuable,although long-wave microwave have to be exploited, and still can not meet the needs of community. To this end, countries around the world are designed spectrum management, users can only use the frequency applications,rely on the channel to prevent the division between the channel interference.Due to the use of spread-spectrum communication related receive this high-tech,low signal output power(“a W,as a general-100mW),and will work in the channel noise and thermal noise in the background,easy to duplicate in the same area using the same frequency,can now all share the same narrow-band frequency communication resources.Spread-spectrum communication is digital communication,particularly for digital voice and data transmission with their own encryption, only in the same PN code communication between users, is good for hiding and confidential in nature, facilitating communication business. Easy to use spread-spectrum CDMA communications, voice compression and many other new technologies, more applicable to computer networks and digitization of voice,image information transmission.Communication in the most digital circuits, equipment, highly integrated, easy installation, easy maintenance, but also very compact and reliable. The average failure rate no time was very long.1.3 Spread spectrum communication systemSpread spectrum communication,namely, spread spectrum communications (Spread spectrum communication), with fiber-optic communications,satellite communications,with access to the information age as the three major high-tech communications transmission. Spread spectrum communication is to send the information to be pseudo-random data is coded(Spread spectrum sequence: spread sequence) modulation, spread spectrum and then the realization of transmission; thereceiving end is using the same modem code and related processing, the restoration of the original data. Spread spectrum communication system has three main characteristics.(1) Carrier is an unpredictable, or so-called pseudo-random broadband signal.(2) Carrier data bandwidth than the modulation bandwidth is much wilder.(3) Receiving process is generated by local broadband carrier signal and receiving a copy of the signal to the broadband signal to achieve.The main way of spread spectrum are as follows: Direct Sequence Spread Spectrum(DSSS) using high-speed pseudo-random code on to the low-speed data transmission spread spectrum modulation; Frequency-hopping system using pseudo-random code to control the carrier frequency in a wider band of the change; TH is the data transmission time slot is a pseudo-random; chirp frequency system is a linear extension of the process of change. Combination of a number of ways of hybrid systems are often applied.The most important measure pf spread-spectrum system is an indicator of spreading gain, also known as processing gain. It is precisely because of the spread spectrum system itself with its performance characteristics with a series of advantages.1.4 Code division multiple accessCode division multiple access (CDMA) is a channel access method used by various radio communication technologies. It should not be confused with the mobile phone standards called cdmaOne, CDMA2000(the 3G evolution of cdmaOne) and WCDMA (the 3Gstandard used by GSM carrier), which are often referred to as simply CDMA, and use CDMA as an underlying channel access method.One of the concepts in data communication is the idea of allowing several transmitters to send information simultaneously over a signal communication channel. This allows several users to share a band of frequencies (see bandwidth). This concept is called multiple access. CDMA employs spread-spectrum technology and a special coding scheme( where each transmitter is assigned a code) to allow multiple user to be multiplexed over the same physical channel. By contrast, time division multipleaccess (FDMA) divides it by frequency. CDMA is a form of spread-spectrum signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated.1.5 Spread-spectrum characteristic of CDMAMost modulation schemes try to minimize the bandwidth of this signal since bandwidth is a limited resource. However, spread spectrum use a transmission bandwidth that is several orders of magnitude greater than the minimum required signal bandwidth. One of the initial reasons for doing this was military applications including guidance and communication systems. These system were designed using spread spectrum because if its security and resistance to jamming. Asynchronous CDMA has some level of privacy built in because the signal is spread using a pseudo-random code; this code makes the spread spectrum signals appear random or have noise-like properties. A receiver cannot demodulate this transmission without knowledge of the pseudo-random sequence used to encode the data. CDMA also resistant to jamming. A jamming signal only has a finite amount of power available to jam the signal. The jammer can either spread its energy over the entire bandwidth of the signal or jam only part of the entire signal.CDMA can also effectively reject narrow band interference. Since narrow band interference affects only a small portion of the spread spectrum signal, it can easily be removed through notch filtering without much loss of information. Convolution encoding and interleaving can be used to assist in recovering this lost data. CDMA signal are also resistant to multipath fading. Since the spread spectrum signal occupies a large bandwidth only a small portion of this will undergo fading due to multipath at any give time. Like the narrow band interference this will result in only a small loss of data and can be overcome.Another reason CDMA is resistant to multipath interference is because the delayed versions of the transmitted pseudo-random code, and will thus appear as another user, which is ignored at the receiver. In other words, as long as the multipath channel induces at least one chip of delay, 天the multipath channel induces at least one chip of delay,the multipath signals will arrive at the receiver.in other words, as long as the multipath channel induces at least one chip of delay, the multipath signalswill arrive at the receiver such that they are shifted in time by at least one chip from the intended signal. The correlation properties of the pseudo-random codes are such that this slight delay causes the multipath to appear uncorrelated with the intended signal, and it is thus ignored.Some CDMA devices use a rake receiver, which exploits multipath delay components to improve the performance of the system. A rake receiver combines the information from several correlators, each one tuned to a different path delay, producing a stronger version of the signal than a simple receiver with a signal correlation tuned to the path delay of the strongest signal.Frequency reuse is the ability to reuse the same radio channel frequency at other cell sites within a cellular system. In the FDMA and TDMA systems frequency planning is and important consideration. The frequencies used in different cells must be planned carefully to ensure signals from different cells do not interfere with each other. In a CDMA system, the same frequency can be used in every cell, because channelization is done using the pseudo-random codes. Reusing the same frequency in every cell eliminates the need for frequency planning in a CDMA system; however, planning of the different pseudo-random sequences must be done to ensure that the received signal from one cell does not correlate with the signal from a nearby cell.Since adjacent cell use the same frequencies, CDMA systems have the ability to perform soft handoffs. Soft handoffs allow the mobile telephone to communication simultaneously with two or more cells. The best signal quality in selected until the handoff is complete. This is different from hard handoffs utilized in other cellular systems. In a hard handoff situation, as the mobile telephone approaches a handoff, signal strength may vary abruptly. In contrast, CDMA systems use the soft handoff, which is undetectable and provides a more reliable and higher quality signal.Concluding remarksspread-spectrum technology in the initial stages of development, it has become a theory and a major technological breakthrough. Later in the development process is the improvement and hardware performance improved. Development to thepresent,spread-spectrum technology and the theory has been almost perfect,mainly from the point of view of overall performance, and the other new technology applications. Therefore, the application has been driven by the development of spread-spectrum technology is a power driving force, the future wireless communication systems, such as mobile communication. Wireless LAN, global personal communications, spread-spectrum technology will certainly play an important role.译文正文1.扩频通信系统概述扩频通信，即扩展频谱通信（Spread spectrum communication)，它与光纤通信、卫星通信，一同誉为进入信息时代的三大高技术通信传输方式，扩频通信是将待传送的信息数据被伪随机码调制，实现频谱扩展后再传输；接收端则采用相同的编码进行解调及相关处理，恢复原始信息数据。

通信工程专业英语词汇来源：涛的日志动态围: Dynamic range频率偏值: Frequency offset符号率： Symbol rate码域功率： code domain power频分多址: Frequency Division Multiple Access码分多址: Code Division Multiple Access时分多址: Time Division Multiple Access沃什码： Walsh code误码率： Bit Error Rate，BER帧误码率： Frame Error Rate，FER循环冗余码：Cyclic Redundancy Code，CRC时序分析： timing analyze门限： threshold非同步模式： Asynchronous Mode同步模式： Synchronous Mode邻道功率：ACP D―― Adjacent Channel Power先进移动业务：AMPS---Advanced Mobile Phone Service组织协会：ANSI --- American National Standard Institute 美国国家标准局BPT --- British Post and Telecommunication Standard 英国邮政与电信标准CCIR --- International Radio Consultative Committee 国际无线电咨询委员会CCITT --- International Telegraph and Telephone Consultative Committee国际/电报咨询委员会CEPT --- Conference of European Post and Telecommunication Administrations欧洲邮电行政会议EIA --- Electronic Engineers Association 电子工业协会美ETSI --- European Telecommunication Standards Institute欧洲电信标准委员会FCC --- Federal Communications Commission联邦通信委员会美IEC --- International Electrotechnics Committee国际电工委员会IEE --- Institution of Electrical Engineers电气工程师协会英IEEE--- Institution of Electrical and Electronics Engineers, INC电气与电子工程师协会美ITU --- International Telecommunication Union 国际电信联盟联合国MPT --- Ministry of Post and telecommunications邮政与电信部英TIA --- Telecommunications Industries Association电信工业协会美WARC --- World Administrative Radio Conference世界无线电行政大会ZVEI --- Zentralverband der Electechnischen Industrie电气工业中央协会德ACP --- Adjacent Channel Power邻道功率AMPS --- Advanced Mobile Phone Institute先进移动业务APOC --- Advanced Paging Operator Code先进寻呼操作码AVL --- Average Voice Level平均话音电平BSC --- Base Site Controller基站控制器CDMA --- Code Division Mulitiple Code码分多址CDPD --- Cellular Digital Packet Data蜂窝分组数据系统CSC --- Cell Site Controllor小区控制器DCCH --- Digital Control Channel数字控制信道DECT --- Digital Enhanced Cordless Telecommunications数字增强无绳EDACS --- Enhanced Digital Access Communications System加强的数字接入通信系统ERMES --- European Telecommunications Standards Institute欧洲无线电信息系统ESN --- Electronics Serial Number电子串号FDR --- Frequency Domain Reflectometry频域反射计FLEX --- Flexible Paging System可变速寻呼系统FOCC --- Forward Control Channel前向控制信道FVC --- Forward Voice Channel前向话音信道GSC --- Golay Sequential Coding格雷码GSM --- Global System for Mobile Communications全球移动通信系统IBASIC --- Instrument BASIC仪器BASIC语言IDC --- Instantaneous Deviation Control瞬时频偏控制IMSI --- International Mobile Station Identify国际移动台识别LNA --- Low Noise Amplifier低噪声放大器LPF/HPF --- Low/High Pass Filter低通/高通滤波器LSB/USB --- Lower/Upper Side Band下/上边带MCC --- Mobile Country Code移动业务国家MCS --- Mobile Control Station移动控制站MIN --- Mobile Identification Number移动识别码MNC --- Mobile Network Code移动网MSC ---Mobile Switching Center移动交换中心MSIN --- Mobile Station Identification Number移动台识别码MTSO --- Mobile Telephone Switching Office移动交换局NMSI --- National Mobile Station Identify国移动台识别NMT --- Nordic Mobile Telephone北欧移动系统OTP --- One Time Programmable一次性编程PDC --- Personal Digital Cellular个人数字蜂窝系统PHS --- Personal Handy-Phone System个人手持系统PSTN --- Public Switching Telephone Network公用交换网RECC --- Reverse Control Channel反向控制信道RVC --- Reverse Voice Channel反向话音信道RSSI --- Receiced Signal Strength Indicator接收信号场强指示SCC --- Signalling Channel Controller信令信道控制器SCM --- Station Class Mark移动台级别标志SID --- Syste Indentification Number系统识别号TACS --- Total Access Communications System全选址通信系统TDMA --- Time Division Multiple Access时分多址UUT --- Under Unit Test被测单元VCC --- Voice Channel Controller话音信道控制器VSWR --- Voltages Standing Wave Ratio电压驻波比1997年，爱立信公司向ETSI（欧洲电信标准委员会）提出了EDGE的可行性研究方案，并在同年得到认可。

CDMA versus TDMATerm Paper :DTEC 6810Submitted by:Sabareeshwar Natarajan.Fall 2006DTEC 6810Communication TechnologyCDMA Vs TDMA in travel:Both GSM and CDMA can be found across United States, which doesn’t mean that it doesn’t matter which technology we choose. When we travel domestically it is possible that we reach areas where digital service is not available. While traveling between places it is possible that we reach certain rural areas were only analog access is offered. CDMA handsets offer analog capabilities which the GSM don’t offer. Another difference between GSM and CDMA is in the data transfer methods. GSM’s high-speed wireless data technology, GPRS (General Packet Radio Service), usually offers a slower data bandwidth for wireless data connection than CDMA’s high-speed technology, which has the capability of providing ISDN (Integrated Services Digital Network) with speeds as much as 144Kbps.GSM’s benefits over the CDMA in domestic purpose are that GSM uses SIM card that identifies a user and stores the information in the handset. The SIM card can be swapped between handsets, which enable to move all the contacts to the new handset with ease. CDMA can have this flexibility with their own service that stores data on the operator’s datab ase. This service allows the user to swap data’s between two handsets with a little trouble, but the advantage is it can be done when the handset is even lost but in GSM technology, when a handset is lost, SIM card is also lost with it.When it comes for international roaming handsets with GSM is far better than CDMA handsets because GSM is used in most the markets across the globe. Users using tri-band or quad-band can travel to Europe, India and most of Asia and still can use their cell phone. CDMA does not have this multiband capability, thus cannot be used multiple countries with ease.Differences between CDMA and TDMA:CDMA technology claims that its bandwidth is thirteen times efficient than TDMA and forty times efficient than analog systems. CDMA also have better security and higher data and voice transmission quality because of the spread spectrum technology it uses, which has increased resistance to multipath distortion. The battery life is higher in TDMA compared to CDMA because CDMA handsets transmit data all the time and TDMA does not require constant transmission. CDMA has greater coverage area when compared to TDMA. Though, when it comes to international roaming TDMA is better than CDMA. CDMA is patented by Qualcomm, so an extra fee is paid to Qualcomm. When it comes to United States and Canada market size for CDMA is larger than GSM’s market size but worldwide the market size for GSM is far bigger both in the number of subscribers and coverage ,than CDMA.Conclusion:From the comparisons made above we cannot say that TDMA is better than CDMA or vice versa. The main advantage of the CDMA is that, in the single detection method it is more flexible than TDMA or joint detection. CDMA is said to have higher capacity than TDMA. But in the future GSM can be extended by an optional CDMA component in order to further increase the capacity. Finally, it does not matter whether which one is better CDMA or TDMA right now. It can be only found out with the evolution of these technologies. When going for a cell phone the user should choose the technology according to where they use it. For users who travel abroad it is better to go with GSM handsets. For the users in United States CDMA is better than TDMA because of the coverage we can get at rural areas where digital signals cannot be transmitted.CDMA与TDMA学期论文：6810 DTEC提交：sabareeshwar纳塔拉詹。

安徽建筑大学毕业设计英文翻译专业电子信息工程班级2010级学生姓名方芳学号10205010242 课题码分多址通信系统的建模、仿真和设计——初始化模块、基站接收模块指导教师冯俊2014 年 06 月 10 日译文原文1.1 The basic concept of spread-spectrum communicationSpread spectrum communication’s basic characteristics, is used to transmit information to the signal bandwidth(W) is far greater than practical required minimum(effective) bandwidth (F∆),as the radio of processing gain P G.=/G P∆FWAs we well know,the ordinary AM,FM,or pulse code modulation,GP value in the area more than 10 times,collectively,the “narrow-band communication”,and spread-spectrum communication GP values as hundred or even thousands of times, can be called “broadband communication”.Due to the spread-spectrum signal,it is very low power transmitters,transmission space mostly drowned in the noise,it is difficult to intercepted by the other receiver ,only spreading codes with the same (or random PN code) receiver, Gain can be dealt with ,and despreading resume the original signal.1.2 The technology superiority of spread-spectrum communication.Strong anti-interference, bit error rate is low. As noted above, the spread spectrum communication system due to the expansion of the transmitter signal spectrum, the receiver despreading reduction signal produced spreading gain, thereby greatly enhancing its interference tolerance. Under the spreading gain, or even negative in the signal-to-noise ratio conditions, can also signal from the noise drowned out Extraction, in the current business communications systems, spread spectrum communications systems, spread spectrum communication is only able to work in a negative signal-to-noise ratio under the conditions of communication .Anti-multi-path interference capability, increase the reliability of system. Spread-spectrum systems as used in the PN has a good correlation, correlation is very weak. Different paths to the transmission signal can easily be separated and may intime and re-alignment phase, formation of several superimposed signal power, thereby improving the system’s performance to receive increased reliability of the system.Easy to use the same frequency, improving the wireless spectrum utilization. Wireless spectrum is very valuable,although long-wave microwave have to be exploited, and still can not meet the needs of community. To this end, countries around the world are designed spectrum management, users can only use the frequency applications,rely on the channel to prevent the division between the channel interference.Due to the use of spread-spectrum communication related receive this high-tech,low signal output power(“a W,as a general-100mW),and will work in the channel noise and thermal noise in the background,easy to duplicate in the same area using the same frequency,can now all share the same narrow-band frequency communication resources.Spread-spectrum communication is digital communication,particularly for digital voice and data transmission with their own encryption, only in the same PN code communication between users, is good for hiding and confidential in nature, facilitating communication business. Easy to use spread-spectrum CDMA communications, voice compression and many other new technologies, more applicable to computer networks and digitization of voice,image information transmission.Communication in the most digital circuits, equipment, highly integrated, easy installation, easy maintenance, but also very compact and reliable. The average failure rate no time was very long.1.3 Spread spectrum communication systemSpread spectrum communication,namely, spread spectrum communications (Spread spectrum communication), with fiber-optic communications,satellite communications,with access to the information age as the three major high-tech communications transmission. Spread spectrum communication is to send the information to be pseudo-random data is coded(Spread spectrum sequence: spread sequence) modulation, spread spectrum and then the realization of transmission; thereceiving end is using the same modem code and related processing, the restoration of the original data. Spread spectrum communication system has three main characteristics.(1) Carrier is an unpredictable, or so-called pseudo-random broadband signal.(2) Carrier data bandwidth than the modulation bandwidth is much wilder.(3) Receiving process is generated by local broadband carrier signal and receiving a copy of the signal to the broadband signal to achieve.The main way of spread spectrum are as follows: Direct Sequence Spread Spectrum(DSSS) using high-speed pseudo-random code on to the low-speed data transmission spread spectrum modulation; Frequency-hopping system using pseudo-random code to control the carrier frequency in a wider band of the change; TH is the data transmission time slot is a pseudo-random; chirp frequency system is a linear extension of the process of change. Combination of a number of ways of hybrid systems are often applied.The most important measure pf spread-spectrum system is an indicator of spreading gain, also known as processing gain. It is precisely because of the spread spectrum system itself with its performance characteristics with a series of advantages.1.4 Code division multiple accessCode division multiple access (CDMA) is a channel access method used by various radio communication technologies. It should not be confused with the mobile phone standards called cdmaOne, CDMA2000(the 3G evolution of cdmaOne) and WCDMA (the 3Gstandard used by GSM carrier), which are often referred to as simply CDMA, and use CDMA as an underlying channel access method.One of the concepts in data communication is the idea of allowing several transmitters to send information simultaneously over a signal communication channel. This allows several users to share a band of frequencies (see bandwidth). This concept is called multiple access. CDMA employs spread-spectrum technology and a special coding scheme( where each transmitter is assigned a code) to allow multiple user to be multiplexed over the same physical channel. By contrast, time division multipleaccess (FDMA) divides it by frequency. CDMA is a form of spread-spectrum signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated.1.5 Spread-spectrum characteristic of CDMAMost modulation schemes try to minimize the bandwidth of this signal since bandwidth is a limited resource. However, spread spectrum use a transmission bandwidth that is several orders of magnitude greater than the minimum required signal bandwidth. One of the initial reasons for doing this was military applications including guidance and communication systems. These system were designed using spread spectrum because if its security and resistance to jamming. Asynchronous CDMA has some level of privacy built in because the signal is spread using a pseudo-random code; this code makes the spread spectrum signals appear random or have noise-like properties. A receiver cannot demodulate this transmission without knowledge of the pseudo-random sequence used to encode the data. CDMA also resistant to jamming. A jamming signal only has a finite amount of power available to jam the signal. The jammer can either spread its energy over the entire bandwidth of the signal or jam only part of the entire signal.CDMA can also effectively reject narrow band interference. Since narrow band interference affects only a small portion of the spread spectrum signal, it can easily be removed through notch filtering without much loss of information. Convolution encoding and interleaving can be used to assist in recovering this lost data. CDMA signal are also resistant to multipath fading. Since the spread spectrum signal occupies a large bandwidth only a small portion of this will undergo fading due to multipath at any give time. Like the narrow band interference this will result in only a small loss of data and can be overcome.Another reason CDMA is resistant to multipath interference is because the delayed versions of the transmitted pseudo-random code, and will thus appear as another user, which is ignored at the receiver. In other words, as long as the multipath channel induces at least one chip of delay, 天the multipath channel induces at least one chip of delay,the multipath signals will arrive at the receiver.in other words, as long as the multipath channel induces at least one chip of delay, the multipath signalswill arrive at the receiver such that they are shifted in time by at least one chip from the intended signal. The correlation properties of the pseudo-random codes are such that this slight delay causes the multipath to appear uncorrelated with the intended signal, and it is thus ignored.Some CDMA devices use a rake receiver, which exploits multipath delay components to improve the performance of the system. A rake receiver combines the information from several correlators, each one tuned to a different path delay, producing a stronger version of the signal than a simple receiver with a signal correlation tuned to the path delay of the strongest signal.Frequency reuse is the ability to reuse the same radio channel frequency at other cell sites within a cellular system. In the FDMA and TDMA systems frequency planning is and important consideration. The frequencies used in different cells must be planned carefully to ensure signals from different cells do not interfere with each other. In a CDMA system, the same frequency can be used in every cell, because channelization is done using the pseudo-random codes. Reusing the same frequency in every cell eliminates the need for frequency planning in a CDMA system; however, planning of the different pseudo-random sequences must be done to ensure that the received signal from one cell does not correlate with the signal from a nearby cell.Since adjacent cell use the same frequencies, CDMA systems have the ability to perform soft handoffs. Soft handoffs allow the mobile telephone to communication simultaneously with two or more cells. The best signal quality in selected until the handoff is complete. This is different from hard handoffs utilized in other cellular systems. In a hard handoff situation, as the mobile telephone approaches a handoff, signal strength may vary abruptly. In contrast, CDMA systems use the soft handoff, which is undetectable and provides a more reliable and higher quality signal.Concluding remarksspread-spectrum technology in the initial stages of development, it has become a theory and a major technological breakthrough. Later in the development process is the improvement and hardware performance improved. Development to thepresent,spread-spectrum technology and the theory has been almost perfect,mainly from the point of view of overall performance, and the other new technology applications. Therefore, the application has been driven by the development of spread-spectrum technology is a power driving force, the future wireless communication systems, such as mobile communication. Wireless LAN, global personal communications, spread-spectrum technology will certainly play an important role.译文正文1.扩频通信系统概述扩频通信，即扩展频谱通信（Spread spectrum communication)，它与光纤通信、卫星通信，一同誉为进入信息时代的三大高技术通信传输方式，扩频通信是将待传送的信息数据被伪随机码调制，实现频谱扩展后再传输；接收端则采用相同的编码进行解调及相关处理，恢复原始信息数据。

扩频通信技术在实际中的应用摘要：通过介绍扩频通信技术的概念及原理来研究它是如何在实际中应用的。

关键词: 扩频分类应用正文：一、扩频技术是近年发展非常迅速的一种技术，它不仅在军事通信中发挥出了不可取代的优势，而且广泛地渗透到了通信的各个方面，如卫星通信、移动通信、微波通信、无线定位系统、无线局域网、全球个人通信等。

扩展频谱通信(Spread Spectrum Communication)川简称“扩频通信”。

是将发送的信息展宽到一个很宽的频带上，这一频带比要发送的信息带宽宽的多，在接收端通过相关接收，从而将信号恢复到信息带宽。

扩频通信按其工作方式的不同，可分为直接序列扩频(DS)，跳频(FH)，跳时(TH)，以及它们的组合方式，如：FH／DS，TH／DS，FH／TH等。

不同的扩频技术，其抗干扰机理和对不同扰的抵抗能力是不同的。

直接序列扩频技术通过相关处理，降低进入解调器的信号功率来达到抗干扰目的；跳频系统依靠载频的随机跳变，以躲避方式对抗通信中的干扰。

直接序列扩频技术是目前应用较为广泛。

三、低轨卫星通信信道模型低轨口星通信信道是一种无线衰落时变信道。

其中，径衰落、阴影衰落及多普勒频移是影响低轨卫星信道的主要因素。

将低轨卫星通信的传播环境分为城市环境、开阔地带环境、农村及郊区环境三种，分别用瑞利信道、莱斯信道和C．I舶信道模璎来近似n-lo]。

2．1城市环境在此情况下，视线分冒可以认为是完全被建筑物阻挡吸收，直射分量：(f)为零，接收的信号为各条路径的散射分量之和，此时只存在多径衰落。

各途径传播的散射信号相互独立，而且散射信号的振幅之和是恒定的，合成信号的包络服从瑞利(Rayleigh)分布，其概率密度函数为，式中，r为接收信号的包络，，为平均多径功率，合成信号的相位服从[0，27r)的均匀分布，此时的信道属于瑞利信道。

当采用SystemVue软件建立其仿真模型时，可由JK信道子系统构成，设其多径数目为5，最大多普勒频移为20kHz。