利用循环前缀的OFDM系统定时同步算法

doi:10.3969/j.issn.1001-2400.2013.01.025

Abstract

Abstract:

Due to the intersymbol interference (ISI), the Maximum Likelihood (ML) algorithm using the cyclic prefix (CP) in orthogonal frequency division multiplexing (OFDM) systems performs poorly in frequency selective fading channels. Firstly, a novel timing metric is presented, which avoids the disadvantage of ensemble correlation. Using the sample data that is not affected by the ISI, the novel algorithm performs correlation operations between two data blocks which are a distance of an OFDM symbol length apart from each other. Secondly, we propose a novel detection function. By searching its maximum in a search range decided by the maximum of the timing metric and the length of CP, the timing offset is gained and the time synchronization can be obtained. Simulation results show that the novel algorithm has more accurate time offset estimation, smaller Mean Square Error (MSE) and lower complexity in frequency selective fading channels.

Key words: frequency selective fading, intersymbol interference, cyclic prefix, orthogonal frequency division multiplexing, ensemble correlation, time synchronization

CLC Number:

TN92

WANG Han;ZHU Leiji;SHI Yusong;XING Tao;WANG Yingguan. Novel time synchronization algorithm using the cyclic prefix for OFDM systems[J].J4, 2013, 40(1): 141-147.

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Novel time synchronization algorithm using the cyclic prefix for OFDM systems

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