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Study of Timing Synchronization in MIMOOFDM

Study of Timing Synchronization in MIMOOFDM
Study of Timing Synchronization in MIMOOFDM

Study of Timing Synchronization in MIMO-

OFDM Systems Using DVB-T

Farhan Farhan

Electrical Systems Technology Instructor, A-B Tech, Asheville NC, USA

A BSTRACT

OFDM (Orthogonal Frequency Division Multiplexing)provides the promising physical layer for 4G and 3GPP LTE Systems in terms of efficient use of bandwidth and data rates. This paper highlights the implementation of OFDM in Digital Video Broadcasting-Terrestrial (DVB-T). It mainly focuses on the timing offset problem present in OFDM systems and its proposed solution using Cyclic Prefix (CP) as a modified SC (Schmidl and COX) algorithm. It also highlights the timing synchronization as well as performance comparison through bit error rate. Synchronization issues in OFDM are important and can lead to information loss if not properly addressed. Simulations were performed to implement DVB-T system and to compare different synchronization methods under certain distribution model.

K EYWORDS

OFDM, Timing, Synchronization, DVB, BER

1.I NTRODUCTION

The advancement in wireless and mobile communication has led the researchers to design and implement transceiver with higher data rates using the bandwidth efficiently. The single carrier modulation scheme is not enough to meet the demands of high data rates and higher capacity. To achieve this goal, multicarrier networks such as FDM (Frequency Division Multiplexing) were utilized since 1950’s but it was hard to implement those networks. This implementational complexity caused to limit their use for military applications[1]. In multicarrier system, there are a number of carriers which carry the information in parallel manner. This system is less susceptible to noise and interference especially in wireless environment. Chang [2] was the first who introduced Orthogonal Frequency Division Multiplexing (OFDM) by further developing and utilizing the Frequency Division Multiplexing (FDM) in 1950. In OFDM systems, synchronization at the receiver is one of the important steps to retrieve the information correctly. There are two ways to achieve the synchronization: one is to find the correct incoming symbol timing and the other is to determine the carrier frequency offset (CFO). This paper discusses the synchronization approach to correct timing offset with the assumption that CFO correction has been made. There are many approaches found in literature to observe the timing synchronization in conventional OFDM systems. This paper investigates the effect of timing offset on Bit Error Rate Probability to determine the performance analysis of OFD Mutilized in DVB-T scheme. The European Telecommunication Standards Institute (ETSI)adopted a standard called DVB-T in 1997 for digital information transmission through terrestrial channels. OFDM was the chosen modulation approach in this standard and there are two modes for the implementation of DVB-T namely, 2K and 8K mode.

2. OFDM SYSTEM MODEL

A basic OFDM system model [3] has PSK or QAM modulator/demodulator, a serial to parallel /parallel to serial converter, and an IFFT/FFT module. The hardware implementation of OFDM requires the use of either ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array) in applications such as DVB, DA

B and SDR (Software Defined Radio) and so on. Mathematically, an l th OFDM signal at the k th subcarrier can be expressed as

[4]

, ( )= ( ), 0< ≤ 0, ?

Then the continuous-time passband OFDM signal is given by

( )= 1

[ ] , ( )

Therefore, the discrete-time baseband OFDM signal can be achieved by sampling the continuous-time OFDM signal att = lTsym + nTs and is given as

( )=1√ / ? ≤ ≤ +

Where N is the IFFT/FFT length. Ng represents the number of guard samples.

Considering perfect timing and no carrier frequency offset, the samples at receiver can be expressed as

( )= ( )

+ ( )

where ( )is the additional Gaussian white noise.

Figure 1 : Block Diagram for DVB-T Transmitter

2.1. OFDM Transmission and Reception in DVB-T

The block diagram for DVB-T standard is shown in the Figure 1. The processes described in this diagram are carried out in a Digital Signal Processor (DSP). This paper focuses on the implementation of 2K mode of DVB-T standard [5] and the parameters for this mode are given in table.

Parameters 2K Mode

Elementary Period (T) 7/64

Number of Carriers (K) 1705

Value of carrier number K min

Value of carrier number K max 1704

Duration (T U ) 224

Carrier Spacing (1/T U ) 4464 Hz

Spacing between carriers K min and K max 7.61 MHz

Allowed Guard Interval Δ/

1/4, 1/8, 1/16, 1/32 Duration of Symbol part 224

Duration of guard interval Δ 56 , 28 , 14 , 7

Symbol Duration =Δ+ 280 , 252 , 238 , 231

Table 1 : OFDM Parameters for DVB-T 2K Mode

The OFDM signal expression in DVB-T is given by the following emitted signal

( )= , , , , ( )

Where,

k denotes the carrier number;

l denotes the OFDM symbol number;

m denotes the transmission frame number;

K is the number of transmitted carriers;

Ts is the symbol duration;

T U is the inverse of the carrier spacing;

Δ is t he duration of the guard interval;

f c is the central frequency of the radio frequency (RF) signal;

k is the carrier index relative to the center frequency,

?= k ? (Kmax + Kmin)/2

c m, 0,k complex symbol for carrier k of the Data symbol no.1

in frame number m;

c m, 1,k complex symbol for carrier k of the Data symbol no.2

in frame number m;

...

c m, 67,k complex symbol for carrier k of the Data symbol

no.68 in frame number m.

The 2K mode of DVB-T is specifically for the mobile reception of standard definition DTV (Digital Television).The OFDM transmission is carried out in frames. Each frame has duration of T F and consists of 68 OFDM symbols.One super-frame consists of four frames and each symbol is comprised of 1705 carriers in 2K mode with Ts as the symbol duration. It is composed of two parts: a useful part with duration T U and a guard interval with a duration Δ.

The guard interval consists in a cyclic continuation of the useful part, T U, and is inserted before it. There are standards only for DVB-T transmitter and the design of receiver is open.

3.T IMING S YNCHRONIZATION AND P ROPOSED A PPROACH

In OFDM, modulation and demodulation are done using IFFT (Inverse Fast Fourier Transform) and FFT (Fast Fourier Transform) techniques, which also cause delay in the system. It is important to find the start of the OFDM symbol at the receiving end and the error in estimating the beginning of symbol causes the timing offset error. Therefore it is necessary to perform symbol time synchronization to find the start of the OFDM symbol. If this delay is not given any attention, it causes phase rotat ion in the constellation. If δ is the amount of offset in time domain then it causes a phase offset of 2πkδ/N in the frequency domain. This phase offset varies directly in proportion with the sub-carrier index k. There are several methods to address the issue of timing offset correction in literature. Classen focuses a method to find both timing offset and carrier frequency offset together. In his method, he considered the trial and error method, which is very computationally complex [6]. Another way to find the timing offset is using the means of slopes of the curve of carrier phases in pilots versus the index of pilots. Minn and Bhargava presented the timing synchronization by modifying the Schmidl and Cox’s method and using a new pattern for training sequence [7].This paper provides the modified Schmidl and Cox’s approach by not using the training sequence and making cyclic prefix (CP) as the reference. The main advantage of avoiding training sequence is to obtain efficiency in transmitting power. The methods which require the use of training preamble requires extra overhead for transmitting training sequences along with the information signal. This approach uses the sliding window technique to compute the correlation of the received signal with the cyclic prefix, which is already known,to the user. The timing metric obtained by the correlation shows the variance and the start of OFDM frame can be taken where the maximum lies in this spread of variance.

4. SIMULATIONS RESULTS

The DVB-T 2K mode was simulated considering the effect of Additive White Gaussian Channel. The simulations were carried out to observe the effect of timing offset along with different channel environment. These results also include the timing metric and correlation of the samples to correct timing offset error. The Bit error probability (BER) plots were also observed to see the trade off between SNR and BER with effect of timing offset.It is clear that carriers are baseband discrete-time and we can use them for discrete-time baseband simulation. However, the focus of this implementation was on passband continuous time-domain simulation. The first step to produce a continuous time-domain signal is to apply a transmit filter g(t).After using the transmit filter, a reconstruction filter D/A was used to avoid aliasing. The proposed reconstruction filter[5] is a Butterworth filter of order 13 and cut-off frequency of approximately 1/T.

Figure 2: Passband Signal

Figure 3: Frequency Response of the Passband Signal

Figure 3 shows the frequency response of the time-domain passband signal as well as power density spectrum of the signal shown over the useful bandwidth.

Figure 4: Time Response of the Signal After Timing Jitter

The effect of timing offset in passband signal can be seen in Figure 4 where the comparison between signal with and without time offset is shown.

Figure 5: Effect of AWGN Channel

To observe the effect of timing offset in the system, physical channel information was added.The distribution of channel used was AWGN. The effect of AWGN channel can be seen in Figure 5.

Figure 6: Signal Carriers at Receiver

The implementation of receiver was reverse of transmitter. The plot shown in Figure 6 shows stem plot of the carriers received at the receiver side.

Figure 7: Ideal Constellation Diagram

The ideal constellation diagram of a 4-QAM signal is also shown in Figure 7. The study was carried out by considering one distribution models namely, AWGN. In this study, the sampling rate is defined by Ts =2.747ns and the time offset was measured by the number of samples delayed. Hence, the actual delay can be calculated using Td = kTs where k is the number of samples delayed.

Figure 8: Proposed Approach

After implementing the proposed approach, the result of timing metric (Figure 8) is obtained in terms of correlation of samples. The effect of noise imposed by the channel was assumed to be cancelled at the receiver side. The case-by-case analysis was performed where each case was studied with different value of time-offset samples. It is clear that the reconstructed signal constellation with higher SNR value follows the ideal constellation more closely than those with less SNR value.

Figure 9: Case-I (Time Offset=1 Sample)

Figure 10: Case-II (Time Offset=5 Samples)

Figure 9 and 10, shows the comparison of different cases where the value of time offset sample varies. The BER Plots (Figure 11) show that SNR value required to correct the bit error rate is higher in case of 5 samples delay than with 1 sample delay.

Figure 11: BER Comparison

Simulating the model with different conditions in AWGN environment performed the comparison. This comparison is shown in Table 2 in which the trend of increasing time offset on SNR in dB was observed.

Timing Offset BER SNR (dB ) 1 10-5 9.8 5 10-5 10 15 10-5 10.5

Table 2: Comparison of Time Offset with SNR in dB

4. CONCLUSIONS

The main objective of this paper was to study and investigate the need for timing synchronization errors in OFDM system, the major effects of timing offset errors, performance of system with reference to BER and then to compare some of the synchronization algorithms. The goal

was achieved by implementing the OFDM system using DVB-T as an example with the effect as well as correction of timing jitter. On the concluding remarks, it was observed that AWGN environment was primitive and good enough to study the topic whereas Fading environment gives the good picture of practical scenario. The future work will involve the investigation and simulation of different probabilistic models in state of the art technologies such as 5G LTE.

REFERENCES

[1] M. L. Doelz, E. T. Heald, and D. L. Martin, “Binary data transmission techniques for linear systems,”

Proceedings of the IRE, vol. 45, no. 5,pp. 656–661, 1957.

[2] R. W. Chang, “Synthesis of band-limited orthogonal signals formultig channel data transmission,”

Bell Systems Technical Journal,vol. 45, pp. 1775–1796, Dec. 1966. [Online]. Available: https://www.doczj.com/doc/7811007892.html,/bstj/vol45-1966/articles/bstj45-10-1775.pdf

[3] S. Diggavi, “Analysis of multicarrier transmission in time-varying channels”, in Communications,

1997. ICC ’97 Montreal, Towards the Knowledge Millennium. 1997 IEEE International Conference on, vol. 3, 1997,pp. 1191–1195 vol.3.

[4] Y. S. Cho, MIMO-OFDM wireless communications with MATLAB.Singapore; Hoboken, NJ: IEEE

Press: J. Wiley & Sons (Asia), 2010.[Online]. Available: https://www.doczj.com/doc/7811007892.html,/id/10412611

[5] G. Acosta, “OFDM simulation using matlab,” Georgia Institute of Technology, Smart Antenna

Research Laboratory, Tech. Rep., Aug.2000. [Online]. Available: https://www.doczj.com/doc/7811007892.html,/research/labs/sarl/tutorials/OFDM/Tutorial web.pdf

[6] M. Speth, F. Classen, and H. Meyr, “Frame synchronization of ofdmsystems in frequency selective

fading channels,” in Vehicular Technology Conference, 1997, IEEE 47th, vol. 3, 1997, pp. 1807–

1811 vol.3.

[7] H. Minn, M. Zeng, and V. Bhargava, “On timing offset estimation forofdm systems,”

Communications Letters, IEEE, vol. 4, no. 7, pp. 242–244, 2000.

Authors

technology for more than four years. He has received his Master of Science degree in

Technology (Electrical Engineering) from Western Carolina University, Cullowhee,

North Carolina, USA in 2013 and Bachelor of Science degree in Electrical Engineering

from University of Engineering and Technology, Lahore Pakistan.

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山水田园诗赏析 一、明确概念 1.所谓的山水诗,是以山水花草虫鱼等自然景观为主要描写对象的诗歌;所谓田园诗是指歌咏田园生活的诗歌,大多以农村的景物和农民、牧人、渔父樵夫等的劳动为题材。 2.代表诗人: A.第一个以田园生活入诗的诗人是东晋的陶渊明。第一个山水诗人是南朝的谢灵运。 B.唐朝时,形成了山水田园诗派,以王维、孟浩然等为代表人物。 山水田园诗属于写景诗的范畴,这类诗歌的主要特点就是“一切景语皆情语”,亦即作者笔下的山水自然景物都融入了作者的主观情愫,或者借景抒情,或者情景交融。 二、常见意象与意境: 体味诗歌的意境:要能把握诗中描写了什么样的景物,什么样的生活画面;画面组合所表现的情境氛围;运用了什么手法;表达了什么情感。 1.①炊烟、桑麻、桑榆、桃李、麦苗、豆苗、菊花、鸡、犬、禽雀、眠蚕…… ②意境特点:恬淡宁谧、清新优美、宁静和谐、明丽绚烂、富有生活气息。 ③表现对闲适恬淡的山水田园生活的热爱及悠闲自在、轻松愉悦的心情。 2. ①野径、古木、荆扉、柴门、空林、空山、鸾鹤、孤云、禅房、古寺、暮钟、五柳、接舆、伯夷、叔齐、林叟、幽人、樵夫、寺僧、道人…… ②意境特点:远离尘俗,清幽静谧、淡雅清幽、豁达、淡泊闲适、清冷荒僻。 ③表达希望归隐山林、超然世外、宁静淡泊或自甘寂寞的情怀。 3.①菊花。 菊花一直受到文人墨客的青睐,有人称赞它坚强的品格,有人欣赏它清高的气质。东晋田园诗人陶渊明,写了很多咏菊诗,将菊花素雅、淡泊的形象与自己不同流俗的志趣十分自然地联系在一起,如“采菊东篱下,悠然见南山”。宋人范成大《重阳后菊花二首》中“寂寞东篱湿露华,依前金靥照泥沙”等诗句,都借菊花来寄寓诗人的精神品质。 2. 竹。 亭亭玉立,挺拔多姿,以其“遭霜雪而不凋,历四时而常茂”的品格,赢得古今诗人的喜爱和称颂。苏轼的《於潜僧绿筠轩》有咏竹名句:“宁可食无肉,不可居无竹。无肉令人瘦,无竹使人俗。人瘦尚可肥,士俗不可医。”将竹视为名士风度的最高标识。郑板桥一生咏竹画竹,留下了很多咏竹佳句,如:“咬定青山不放松,立根原在破岩中。千磨万击还坚劲,任尔东西南北风。”赞美了立于岩石之中的翠竹坚定顽强、不屈不挠的风骨和不畏逆境、蒸蒸日上的禀性。 3. 五柳。 陶渊明《五柳先生传》载:宅边有五柳树,因以号为焉。后来“五柳”就成了隐者的代称。如王维的《辋川闲居赠裴秀才迪》:“寒山转苍翠,秋水日潺湲。倚杖柴门外,临风听暮蝉。渡头余落日,墟里上孤烟。负值接舆醉,狂歌五柳前。” 4. 东篱。 陶渊明《饮酒》:“采菊东篱下,悠然见南山。”后来多用“东篱”表现辞官归隐后的田园生活或娴雅的情致。如李清照《醉花阴》:“东篱把酒黄昏后,有暗香盈袖。” 5. 三径。 陶渊明《归去来兮辞》中有“三径就荒,松菊犹存”的句子,后来“三径”就用来指代隐士居住的地方。如白居易的《欲与元八卜邻先有是赠》:“明月好同三径夜,绿杨宜作两家春。”

英语比较级和最高级的用法归纳

英语比较级和最高级的用法归纳 在学习英语过程中,会遇到很多的语法问题,比如比较级和最高级的用法,对于 这些语法你能够掌握吗?下面是小编整理的英语比较级和最高级的用法,欢迎阅读! 英语比较级和最高级的用法 一、形容词、副词的比较级和最高级的构成规则 1.一般单音节词和少数以-er,-ow结尾的双音节词,比较级在后面加-er,最高级 在后面加-est; (1)单音节词 如:small→smaller→smallest short→shorter→shortest tall→taller→tallest great→greater→greatest (2)双音节词 如:clever→cleverer→cleverest narrow→narrower→narrowest 2.以不发音e结尾的单音节词,比较在原级后加-r,最高级在原级后加-st; 如:large→larger→largest nice→nicer→nicest able→abler→ablest 3.在重读闭音节(即:辅音+元音+辅音)中,先双写末尾的辅音字母,比较级加-er,最高级加-est; 如:big→bigger→biggest hot→hotter→hottest fat→fatter→fattest 4.以“辅音字母+y”结尾的双音节词,把y改为i,比较级加-er,最高级加-est; 如:easy→easier→easiest heavy→heavier→heaviest busy→busier→busiest happy→happier→happiest 5.其他双音节词和多音节词,比较级在前面加more,最高级在前面加most; 如:bea utiful→more beautiful→most beautiful different→more different→most different easily→more easily→most easily 注意:(1)形容词最高级前通常必须用定冠词 the,副词最高级前可不用。 例句: The Sahara is the biggest desert in the world. (2) 形容词most前面没有the,不表示最高级的含义,只表示"非常"。 It is a most important problem. =It is a very important problem.

山水田园诗 赏析

1、《饮酒?其五》 晋陶渊明 结庐在人境,而无车马喧。 问君何能尔,心远地自偏。 采菊东篱下,悠然见南山。 山气日夕佳,飞鸟相与还。 此中有真意,欲辨已忘言。 注释 (1)结庐:建造住宅,这里指居住的意思。 (2)车马喧:指世俗交往的喧扰。 (3)君:指作者自己。 (4)何能尔:为什么能这样。尔:如此、这样。 (5)悠然:自得的样子。 (6)见:看见(读jiàn),动词。 (7)南山:泛指山峰,一说指庐山。 (8)日夕:傍晚。相与:相交,结伴。 (9)相与还:结伴而归。 译文 居住在人世间,却没有车马的喧嚣。 问我为何能如此,只要心志高远,自然就会觉得所处地方僻静了。 在东篱之下采摘菊花,悠然间,那远处的南山映入眼帘。 山中的气息与傍晚的景色十分好,有飞鸟,结着伴儿归来。 这里面蕴含着人生的真正意义,想要辨识,却不知怎样表达。 赏析 本诗是陶渊明组诗《饮酒》二十首中的第五首。诗的意象构成中景与意会,全在一偶然无心上。‘采菊’二句所表达的都是偶然之兴味,东篱有菊,偶然采之;而南山之见,亦是偶尔凑趣;山且无意而见,菊岂有意而采?山中飞鸟,为日夕而归;但其归也,适值吾见南山之时,此亦偶凑之趣也。这其中的“真意”,乃千圣不传之秘,即使道书千卷,佛经万页,也不能道尽其中奥妙,所以只好“欲辨已忘言”不了了之。这种偶然的情趣,偶然无心的情与景会,正是诗人生命自我敞亮之时其空明无碍的本真之境的无意识投射。大隐隐于市,真正宁静的心境,不是自然造就的,而是你自己的心境的外化。 千古名句:“采菊东篱下,悠然见南山”,表达了诗人悠然自得、寄情山水的情怀。终南别业 中岁颇好道,晚家南山陲。 兴来每独往,胜事空自知。 行到水穷处,坐看云起时。 偶然值林叟,谈笑无还期。 注解 1、胜事:快意的事。

个人先进事迹简介

个人先进事迹简介 01 在思想政治方面,xxxx同学积极向上,热爱祖国、热爱中国共产党,拥护中国共产党的领导.利用课余时间和党课机会认真学习政治理论,积极向党组织靠拢. 在学习上,xxxx同学认为只有把学习成绩确实提高才能为将来的实践打下扎实的基础,成为社会有用人才.学习努力、成绩优良. 在生活中,善于与人沟通,乐观向上,乐于助人.有健全的人格意识和良好的心理素质和从容、坦诚、乐观、快乐的生活态度,乐于帮助身边的同学,受到师生的好评. 02 xxx同学认真学习政治理论,积极上进,在校期间获得原院级三好生,和校级三好生,优秀团员称号,并获得三等奖学金. 在学习上遇到不理解的地方也常常向老师请教,还勇于向老师提出质疑.在完成自己学业的同时,能主动帮助其他同学解决学习上的难题,和其他同学共同探讨,共同进步. 在社会实践方面,xxxx同学参与了中国儿童文学精品“悦”读书系,插画绘制工作,xxxx同学在班中担任宣传委员,工作积极主动,认真负责,有较强的组织能力.能够在老师、班主任的指导下独立完成学院、班级布置的各项工作. 03 xxx同学在政治思想方面积极进取,严格要求自己.在学习方面刻苦努力,不断钻研,学习成绩优异,连续两年荣获国家励志奖学金;作

为一名学生干部,她总是充满激情的迎接并完成各项工作,荣获优秀团干部称号.在社会实践和志愿者活动中起到模范带头作用. 04 xxxx同学在思想方面,积极要求进步,为人诚实,尊敬师长.严格 要求自己.在大一期间就积极参加了党课初、高级班的学习,拥护中国共产党的领导,并积极向党组织靠拢. 在工作上,作为班中的学习委员,对待工作兢兢业业、尽职尽责 的完成班集体的各项工作任务.并在班级和系里能够起骨干带头作用.热心为同学服务,工作责任心强. 在学习上,学习目的明确、态度端正、刻苦努力,连续两学年在 班级的综合测评排名中获得第1.并荣获院级二等奖学金、三好生、优秀班干部、优秀团员等奖项. 在社会实践方面,积极参加学校和班级组织的各项政治活动,并 在志愿者活动中起到模范带头作用.积极锻炼身体.能够处理好学习与工作的关系,乐于助人,团结班中每一位同学,谦虚好学,受到师生的好评. 05 在思想方面,xxxx同学积极向上,热爱祖国、热爱中国共产党,拥护中国共产党的领导.作为一名共产党员时刻起到积极的带头作用,利用课余时间和党课机会认真学习政治理论. 在工作上,作为班中的团支部书记,xxxx同学积极策划组织各类 团活动,具有良好的组织能力. 在学习上,xxxx同学学习努力、成绩优良、并热心帮助在学习上有困难的同学,连续两年获得二等奖学金. 在生活中,善于与人沟通,乐观向上,乐于助人.有健全的人格意 识和良好的心理素质.

英语比较级和最高级的用法

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