A Joint Time and Frequency Synchronization Method Based on PN Sequences for OFDM
OFDM system performance is sensitive to frequency offset and timing error than single-carried system. In this paper, a novel joint time and frequency synchronization method is proposed based on PN sequences for OFDM. A special training symbol of OFDM is constructed with the PN sequence and the differentially coded PN sequence in the transmitter, in the receiver, the training symbol is differentially decoded to get the time synchronization with the autocorrelation property of PN sequence before the frequency offset is estimated, then it eliminates the effect of polarity of the received signal with local PN sequence to get the fine frequency offset estimation combined with ML method. The performance of time synchronization is excellent in low SNR, the maximum frequency offset estimation range can be up to one half of overall signal bandwidth, the simulation results show that the proposed method is effective.
orthogonal frequency division multiplezing (OFDM) time synchronization frequency synchronization pseudo noise sequence(PN-sequence)
CHENG Wei YANG Rui-juan TUO Xin-yu FAN Zhao-yong
Communication Teaching&Research Section Air Force Radar Academy Wuhan, China Department of Graduate Management Communication Commanding Academy Wuhan, China
国际会议
北京
英文
112-116
2009-08-08（万方平台首次上网日期，不代表论文的发表时间）