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Research On Synchronization Algorithms For Mimo-Ofdm System

Posted on:2014-12-15Degree:MasterType:Thesis
Country:ChinaCandidate:S A ZhangFull Text:PDF
GTID:2268330425493146Subject:Information and Communication Engineering
Abstract/Summary:PDF Full Text Request
MIMO(Multiple Input Multiple Output) technology can significantly improve spectrum utilization and channel capacity without increasing the transmission power and the system bandwidth, OFDM (orthogonal frequency division multiplexing) technology can realize the conversion from a frequency selective channel to the flat channel, as a combination of both, MIMO-OFDM technology can play their advantages the most. However, MIMO-OFDM system is very sensitive to timing and frequency synchronization errors, these errors will directly affect the reliable data transmission and the normal operation of subsequent algorithm, and therefore must first solve the synchronization error problem.The basic principles of the MIMO-OFDM system are introduced firstly in this paper, and analyzing the influence of the three synchronization errors on the system performance.Then, Aiming at the centralized MIMO-OFDM system, two traditional algorithms, Mody and Zelst&Schenk. are studied in depth, and a synchronization algorithm based on the CAZAC(Constant Amplitude Zero Auto Correlation)sequence is analyzed in detail, focusing on the simulation study of this algorithm and the traditional algorithm, and analyzing the advantages and disadvantages of these algorithms by simulation results.Finally, Aiming at the distributed MIMO-OFDM system, the traditional WPS algorithm is analyzed in detail, pointing out the inadequacies of the algorithm, and a improved algorithm based on the WPS algorithm is proposed, comparing with the WPS algorithm through simulation shows that the improved algorithm can not only achieve the correct timing synchronization, but also can effectively estimate the timing offset and frequency offset.
Keywords/Search Tags:multiple input multiple output, orthogonal frequency division multiplexing, training sequence, symbol timing synchronization, frequency synchronization
PDF Full Text Request
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