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引用本文：

任雪峰,蒋宇中,刘旋.OFDM系统的对数似然比最大化盲频偏估计算法[J].电讯技术，2010，50（12）： - . [点击复制]
REN Xue-feng,JIANG Yu-zhong,LIU Xuan.A Log likelihood Ratio Maximization Blind Frequency Offset Estimation Algorithm in OFDM Systems[J].，2010，50（12）： - . [点击复制]

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OFDM系统的对数似然比最大化盲频偏估计算法
任雪峰,蒋宇中,刘旋
0 字体:加大+\|默认\|缩小-
(海军工程大学通信工程系，武汉 430033)

摘要:

为了消除短波OFDM通信中的频率偏移问题，对差分OFDM信号进行了分析，并对最大后验概率（MAP）译码的性质进行了研究，提出了一种似然比最大化的迭代盲频偏估计算法。由于该算法充分利用了软译码得到的似然比信息，因此可以实现最优信号检测。计算机仿真证明了该算法的有效性。进行了短波OFDM信号通信实验，得到了实测数据。实测数据检测结果表明，该算法的误码率性能随着迭代次数的增加而提高，且一发两收系统性能要比单发单收系统性能至少提高2 dB。

关键词: 短波通信差分OFDM调制 MAP译码盲频偏估计

DOI：

基金项目:

A Log likelihood Ratio Maximization Blind Frequency Offset Estimation Algorithm in OFDM Systems

REN Xue-feng,JIANG Yu-zhong,LIU Xuan

(Department of Communication Engineering,Naval University of Engineering,Wuha n 430033,China)

Abstract:

In order to remove the frequency offset in HF OFDM communica tions，the differential OFDM systems are analysed, and the property of M AP decoding is studied. A loglikelihood ratio maximization blind frequency off set estimati on algorithm is proposed. This algorithm can achieve the best demodulation beca use the likelihood ratio of information is used adequately. The simulations show that this algorithm is effective.HF communication experiment is performe d, and practical information is achieved. Using this algorithm to demodulate pra ctical information demonstrates that this algorithm can enhance the BER performa nce with the increasing iterative times, and the performance of onetransmitter/two receiver system is better than that of onetransmitter/onereceiver system a t least 2 dB.

Key words: HF communication differential OFDM modulation MAP decoding blind frequency offset estimation