Digital self-coherent detection

格式：pdf
大小：677.59 KB
文档页数：12

Xiang Liu1*

, S. Chandrasekhar1

, and Andreas Leven2

Bell Laboratories, Alcatel-Lucent, 791 Holmdel-Keyport Road, Holmdel, New Jersey 07733, USA

Bell Laboratories, Alcatel-Lucent, 600-700 Mountain Avenue, Murray Hill, New Jersey 07974, USA

* Corresponding author: xliu20@alcatel-lucent.com

Abstract: We review recent progresses on digital self-coherent detection of

differential phase-shift keyed (DPSK) signal using orthogonal differential

direct detection followed by high-speed analog-to-digital conversion and

digital signal processing (DSP). Techniques such as data-aided multi-

symbol phase estimation for receiver sensitivity enhancement, unified

detection scheme for multi-level DPSK signals, and optical field

reconstruction are described. The availability of signal field information

brings the possibility to compensate for some linear and nonlinear

transmission impairments through further DSP. An adaptive DSP algorithm

for simultaneous electronic polarization de-multiplexing and polarization-

mode dispersion compensation is also presented.

OCIS codes: (060.1660) Coherent communications; (060.5060) Phase modulation; (060.2330)

Fiber optics communication.

References and links

1. R. C. Giles and K. C. Reichmann, "Optical self-homodyne DPSK transmission at 1-Gbit/s and 2-Gbit/s over

86km of fiber," Electron. Lett. 23, 1180-1181 (1987).

2. C. Xu, X. Liu, and X. Wei, “Differential phase-shift keying for high spectral efficiency optical transmissions,” IEEE J. Sel. Top. Quantum Electron. 10, 281 – 293 (2004).

3. A. H. Gnauck and P. J. Winzer, “Optical phase-shift-keyed transmission,” J. Lightwave Technol. 23, 115-

130 (2005).

4. K.-P. Ho, Phase-modulated optical communication systems, (Springer, New York, 2005).

5. F. Derr, “Coherent optical QPSK intradyne system: Concept and digital receiver realization,” J. Lightwave

Technol. 10, 1290-1296 (1992).

6. M. Taylor, “Coherent detection method using DSP for demodulation of signal and subsequent equalization

of propagation impairments,” IEEE Photon. Technol. Lett. 16, 674–676 (2004).

7. R. Noe, “PLL-free synchronous QPSK polarization multiplex/diversity receiver concept with digital I&Q

baseband processing,” IEEE Photon. Technol. Lett. 17, 887-889 (2005).

8. K. Kikuchi, “Phase-diversity homodyne detection of multilevel optical modulation with digital carrier phase

estimation,” IEEE J. Sel. Top. Quantum Electron. 11, 563-570 (2006).

9. M. Nazarathy, Y. Yadin, M. Orenstein, Y. Lize, L. Christen, and A. Willner, " Enhanced Self-Coherent

Optical Decision-Feedback-Aided Detection of Multi-Symbol M-DPSK/PolSK in Particular 8-

DPSK/BPolSK at 40 Gbps," in Optical Fiber Communication Conference and Exposition and The National

Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007),

paper JWA43. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2007-JWA43.

10. M. Nazarathy, X. Liu, L. Christen, Y. Lize, and A. Willner, “Self-coherent decision-feedback-directed 40

Gbps DQPSK Receiver,” IEEE Photon. Technol. Lett. 19, 828-839 (2007).

11. M. Nazarathy, X. Liu, L. Christen, Y. Lize, and A. Wilner, “Self-coherent optical detection of multisymbol

differential phase-shift-keyed transmission ,” J. Lightwave Technol. (accepted for publication).

12. N. Kikuchi, K. Mandai, S. Sasaki and K. Sekine, “Proposal and first experimental demonstration of digital

incoherent optical field detector for chromatic dispersion compensation,” in Proceedings of European

Conference on Optical Communications 2006, Post-deadline Paper Th4.4.4.

13. X. Liu and X. Wei, " Electronic Dispersion Compensation Based on Optical Field Reconstruction with

Orthogonal Differential Direct-Detection and Digital Signal Processing," in Optical Fiber Communication

Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest

Series (CD) (Optical Society of America, 2007), paper OTuA6. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2007-OTuA6.

14. G. Charlet, J. Renaudier, M. Salsi, H. Mardoyan, P. Tran, and S. Bigo, " Efficient Mitigation of Fiber

Impairments in an Ultra-Long Haul Transmission of 40Gbit/s Polarization-Multiplexed Data, by Digital

Processing in a Coherent Receiver," in Optical Fiber Communication Conference and Exposition and The

#87880 - $15.00 USDReceived 25 Sep 2007; revised 26 Nov 2007; accepted 26 Nov 2007; published 9 Jan 2008

（完整版）自动控制专业英语词汇

自动控制专业英语词汇（一）

acceleration transducer 加速度传感器

acceptance testing 验收测试

accessibility 可及性

accumulated error 累积误差

AC-DC-AC frequency converter 交-直-交变频器

AC (alternating current) electric drive 交流电子传动active

attitude stabilization 主动姿态稳定

actuator 驱动器，执行机构

adaline 线性适应元

adaptation layer 适应层

adaptive telemeter system 适应遥测系统

adjoint operator 伴随算子

admissible error 容许误差

aggregation matrix 集结矩阵

AHP (analytic hierarchy process) 层次分析法

amplifying element 放大环节

analog-digital conversion 模数转换

annunciator 信号器

antenna pointing control 天线指向控制

anti-integral windup 抗积分饱卷

aperiodic decomposition 非周期分解

a posteriori estimate 后验估计

approximate reasoning 近似推理

a priori estimate 先验估计

articulated robot 关节型机器人

assignment problem 配置问题，分配问题

associative memory model 联想记忆模型 associatron 联想机

asymptotic stability 渐进稳定性

attained pose drift 实际位姿漂移

光纤中英文缩略语对照

AAS Automatic addressing system 自动寻址系统

AB Absorption Band 吸收带

Address Bus 地址总线

Aligned Bundle 定位光纤

ABC Absorbing Boundary Condition 吸收边界条件

Address Bus Control 地址总线控制

Automatic Bandwidth Control 自动带宽控制

Automatic Bias Compensation 自动偏置补偿

ABCs Automatic Base Communication System 自动基地通信系统

ABM Asynchronous Balanced Mode 异步平衡模式

AC Access control 访问控制(对指定用户而言)或接入控制

Access coupler 通路耦合器

ACA Adaptive channel allocation 自适应信道分配

Adjacent channel attenuation 相邻信道衰减

ACC Area communication center 区域通信中心

Automatic control and checking 自动控制和检查

ACCE Area communication center equipment 区域通信中心设备

ACCH Associaed control channel 相关控制信道

ACCI Adaptive cycle cellinsertion 自适应循环信元插入

ACCS Automatic checkout and control system 自动检验与控制系统

ACD Automatic call distribution 自动呼叫分配

Average core diameter 平均纤芯直径

ACDMA Advanced code division multiple access 高级码分多址

星载AIS信号的带通采样与恢复

马社祥;方婷;宫铭举;郭鑫

【摘要】According to the high performance requirements of satellite

receiver for analog devices, this pa-per puts forward a new method of

directly sampling the RF signal to convert the analog signal to digital sig-nal and the subsequent processing in software module implementation. At

the same time, in order to obtain the status information of the ship at a

lower sampling rate according to Nyquist band-pass sampling theory and

take full advantage of the characteristics of AIS ( Automatic Identification

System ) whose two carrier frequencies are close to each other and the

bandwidth is narrow,a digital demodulation method of satellite-based AIS

signal and the information detection recovery technology is studied. Firstly,

band-pass sampling theory is introduced. Secondly,the determination of

数字信号处理————信号正交的理解以及复数

1.数学解释

正交最早出现于中的。在三维中，两个向量的如果是零，那么就说这两个向量是正交的。

注：

（1）. 在数学中，数量积（dot product; scalar product，也称为点积）是接受在实数R上的两个并返回⼀个实数值的。它是的标准。

（2）. 向量积，数学中⼜称外积、叉积，物理中称⽮积、叉乘，是⼀种在中向量的。与不同，它的运算结果是⼀个向量⽽不是⼀个标

量。并且两个向量的叉积与这两个向量和垂直。

例如：三⾓函数系{1,cosx,sinx,cos2x,sin2x,……,cosnx,sinnx,……}

在区间[-π,π]上正交，就是指在三⾓函数系⑴中任何不同的两个函数的乘积在区间[-π,π]上的积分等于0，即

∫[-π->π]cosnxdx=0

∫[-π->π]sinnxdx=0

∫[-π->π]sinkxcosnxdx=0

∫[-π->π]coskxcosnxdx=0

∫[-π->π]sinkxsinnxdx=0

(k,n=1,2,3.....,k≠n)

2.正交信号的理解

（1）. 定义

正交信号的具有理想冲击函数的形式，为零。然⽽由知道，这样的理想信号是不存在的。因此,需要对发射信号进⾏优化设计，使得信号

的和尽可能低。到⽬前为⽌，国际上⼰经提出了⼀些针对MIMO的正交信号设计⽅法

正交信号，也称为复信号，被⽤于数字信号处理的很多领域，⽐如：数字通信系统、雷达系统、⽆线电测向中对到达时间差异的处理、

相关脉冲测量系统、天线波束形成的应⽤、信号边带调制器等等。实际表⽰复数变量使⽤实部和虚部两个分量。正交信号也⼀样，必须⽤实

部和虚部两路信号来表⽰它，两路信号传输会带来⿇烦，实际信号的传输总是⽤实信号，⽽在信号处理中则⽤复信号。（实部和虚部的称谓

是传统的叫法，在我们⽇常应⽤中⼀直被延⽤。在通信⼯程中分别⽤同相和正交相表⽰。）

好处：由于对相位的确定，使coherentdetection成为可能；对于数字通信，在基带处理带通信号，可以是有效带宽减少⼀半，进⽽对于AD的采样率要求，FFT的处理能⼒等都有改善，⽐如在OFDM系统中transmitter中在基带完成的IFFTblock等。

下载提示

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

Digital self-coherent detection

合集下载

（完整版）自动控制专业英语词汇

光纤中英文缩略语对照

星载AIS信号的带通采样与恢复

数字信号处理————信号正交的理解以及复数

文档推荐

最新文档