【摘要】 利用接收机判决后的OFDM信息数据重构FFT以前的OFDM信号 ,提出了一种OFDM系统中频偏估计的新方法 ,进而得到一种载波频率跟踪方法 .该方法具有不需要引导符号 ,算法简单 ,跟踪精度高等优点 .本文利用 6 4载波 1 6QAM的OFDM系统进行了仿真 ,结果表明 ,该方法对频偏的估计精度相当高 ,当系统存在 1 0 %的初始相对频偏时 ,对信噪比为 1 5dB和 1 8dB的AWGN信道的情形 ,利用本文频偏估计算法构成的跟踪算法仍有很好的跟踪能力更多还原

【Abstract】 Based on the data after decision in OFDM receiver, those data before FFT can be reconstructed. Using them, a new frequency offset estimation method is developed. This method has advantages as simple in algorithm, high precision in tracking, and requiring no additional pilots. Simulation results, based on a 16QAM and 64 subcarriers OFDM system, show that this estimation method is efficient. In AWGN channels with SNR of 15dB and 18 dB, even when the initial relative frequency offset is over 10%, the carrier frequency tracking method based on this estimation algorithm has excellent tracking performance.更多还原