Description: Coarse Symbol Timing
Synchronization (CSTS) algorithm for OFDM systems that
is robust to a multi-path fading channel Platform: |
Size: 343040 |
Author:Oleg |
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Description: 为了减少无线信道中存在的多径和频偏对中国移动多媒体广播(CMMB)系统传输信号同步的影响，本文结合CMMB标准协议规定的具体帧结构，分析了符号同步对系统的影响，讨论了传统最大似然(ML)算法的优缺点，并基于文献中的无数据辅助算法，提出了一种适合该系统并且复杂度较低的粗符号定时同步算法。仿真结果表明，在AWGN及多径信道环境下，新算法可以有效克服传统算法相关峰不明显的缺陷，其估计性能更好-In order to reduce the influence for synchronization of signals in CMMB (China Mobile Multimedia Broadcasting) system, which caused by multi-path and frequency offset in wireless channel. This paper combined the specific frame structure of CMMB standard protocol, analyzed the impact of symbol synchronization, discussed advantages and disadvantages of the traditional ML (Maximum Likelihood) algorithm, and based on the non-data auxiliary algorithm in literature, proposed a coarse symbol timing synchronization algorithm, it is suitable for the system and its complexity is very low. Simulation results show that the new algorithmof signals in CMMB Platform: |
Size: 246784 |
Author:JFS |
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Description: 多天线正交频分复用(MIMO-OFDM,Multiple-Input and Multiple-Output Orthogonal Frequency Division Multiplex)系统中,精确的符号定时同步可使接收端解调数据时消除载波频率偏移和符号间干扰。而由于MIMO空间信道复杂度较高,使得单天线OFDM系统的同步方法不能直接应用于MIMO-OFDM系统中。提出的两步同步方法首先利用时域导频作为第一步同步进行粗同步,然后利用循环交织前缀作为第二步同步对每一个MIMO-OFDM符号进行同步偏差调整。需要指出的是,两次同步过程均可以产生尖锐的相关峰,使得同步精度大为提高。-Accurate timing synchronization of symbol is important for MIMO-OFDM system,and it can eliminate the integral frequency shift of carrier and intersymbol interference.Two-step timing synchronization method is proposed in this thesis.First,the time-domain pilot is employed to obtain coarse timing synchronization,then the interleaved cyclic prefix and maximum likelihood estimation method are adopted to adjust the synchronization difference,through which the correlational characteristic of that window could be ... Platform: |
Size: 807936 |
Author:王睿 |
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Description: Timing Synchronization for 802.11a WLANs under Multipath Channels
In the Wireless Local Area Network
(WLAN) standard adopted by the IEEE 802.11a
standardization group, each data packet starts with a
preamble, which consists of ten short training symbols
followed by two long training symbols. In this paper,
we present an efficient and straightforward coarse
timing synchronization scheme based on the short
training symbols. Simulation results illustrate that the
performance of the proposed scheme is comparable
and even superior to that of the conventional timing
synchronization method under multipath fading
channels. We further show that the combination of
the proposed auto-correlation coarse timing
synchronization scheme and a frequency domain path
delay moving average method leads to a desirable
result of symbol timing estimation. Platform: |
Size: 218112 |
Author:Mohamed |
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Search - COARSE TIMING SYNCHRONIZATION