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Research on Iterative Symbol Timing and Carrier Synchronization of OFDM System

Author: TangShouLing
Tutor: WuChangQi
School: Yanshan University
Course: Communication and Information System
Keywords: Orthogonal frequency division multiplexing Timing synchronization Frequency Synchronization Maximum Likelihood Algorithm Observation window When partial iterative estimation
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 51
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Abstract


Orthogonal frequency division multiplexing ( OFDM ) is the core of the fourth generation mobile communication technology , its advantage is the ability to have good resistance to multipath fading and improve the utilization of the spectrum . However , OFDM systems are very sensitive to the frequency offset and phase noise , frequency offset destroys the orthogonality between the subcarriers . Therefore, in the OFDM communication system , the carrier frequency and symbol timing deviation is a major factor affecting system performance . In this paper, the OFDM system carrier synchronization and symbol synchronization conducted in-depth research . First, the synchronization timing deviation and carrier frequency deviation of the OFDM system is described , to discuss the synchronization algorithm of the OFDM system , the synchronization algorithm was analyzed . Second, in-depth study based on cyclic prefix ( CP ) , the maximum likelihood ( ML ) algorithm . For Frequency Offset Estimation by symbol timing estimation issues affecting the CP - based ML algorithm improvements have been made . Improved algorithm for three consecutive symbol ML estimates , during the frequency offset estimation , through the use of the observation window in the window on the frequency offset estimate mean operation , the frequency offset estimation error correction . Using MATLAB simulation analysis estimated symbol inaccurate , the improved algorithm and the original algorithm CFO estimation . The results show that the improved algorithm reduces the symbol timing imprecise estimates of the impact on the frequency offset estimation , frequency offset estimation accuracy . Finally, since the multipath channel symbols of the OFDM symbol timing synchronization caused by a relatively large impact , symbol timing synchronization loop iteration calculation unbiased estimate bias estimation error decreases , and ultimately determine the starting position of the symbol , synchronization reached symbols . Using MATLAB simulation analysis of the amount of computation and computing speed , the synchronization iterative estimation is feasible .

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