【摘要】 针对受到传播时延、多普勒效应以及发送端与接受端振荡器的不匹配等因素影响的正交频分复用OFDM(orthogonal frequency division multiplexing)无线系统载频与定时偏移问题,提出了一种基于周期稳态性的载频与定时偏移估计算法CSBE(cycloslationary based estimation)。该算法通过对接收信号的周期稳态性及相关性估测出频率偏移与时隙偏移,进而有效地提高OFDM系统抗频率与定时偏移的能力。仿真实验以及与现有BE算法的性能比较表明,提出的频率与定时偏移估计算法在加性高斯白噪声AWGN(addi-tive white Gaussian noise)与瑞利衰落信道下都明显地减小了频率与定时偏移误差。更多还原

【Abstract】 Because of the problem of frequency and timing offsets caused by propagation delay,Doppler effect and the mismatch between sending and receiving oscillator in OFDM wireless systems,a frequency and timing offsets estimation algorithm based on cyclostationary called CSBE was proposed. The algorithm estimated frequency and timing offsets for cyclostationary and correlation to improve the ability of anti-frequency and timing offsets.Simulation and comparison results prove that the proposed CSBE algorithm decreases the errors of frequency and timing offsets in AWGN and Rayleigh-fading channels.更多还原