一种新的基于判决反馈的OFDM频率跟踪算法
A New Efficient OFDM Frequency Offset Tracking Algorithm Based on Decision-directed
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摘要: 该文提出了一种新的用于多径信道的基于判决反馈的OFDM载波频率跟踪算法。该算法具有精度高,计算量小,实现简单的优点。基于该算法的特点同时提出了根据信道特性加权的改进方法,加强了对抗频率选择性衰落信道的能力,进一步提高了在低信噪比下的跟踪性能。
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关键词:
- 正交频分复用; 多载波; 频偏; 同步
Abstract: A new OFDM decision-directed carrier frequency offset tracking algorithm is presented. High precision, low computational efforts and simple implement are obtained with the new algorithm. And an improvement method is also described which enhances the capacity of resist frequency selected fading channel, based on channel information. With this method, the tracking performance at low SNR is improved. -
Pollet T, Bladel M, Moeneclaey M. BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise[J].IEEE Trans. on Commun.1995, 43(2/3/4):191-[2]van de Beek J J, Sandell M, Borjesson P O. ML estimation of time and frequency offset in OFDM systems[J].IEEE Trans. on Signal Processing.1997, 45(7):1800-[3]Luise M, Marselli M, Reggiannini R. Low complexity blind carrier frequency recovery for OFDM signals over frequencyselective radio channels[J].IEEE Trans. on Commun.2002, 50(7):1182-[4]朱鹏程,杜岩,刘鹏,张伟.一种新的OFDM系统载波频率捕获算法[J].电子与信息学报.2004,26(6):859-863浏览 -
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