针对符号重叠PCC—OFDM系统,提出了一种盲时偏估计算法。利用并行干扰删除方法消除系统固有的严重的符号间干扰,利用解调信号方差进行判决,获得精确的时偏估计。该算法不需要训练序列、导频信号或周期前缀。在高斯白噪声和Ricean信道下对算法进行了链路仿真,仿真结果证明,该算法能够有效地实现符号重叠PCC—OFDM盲时偏估计。
An algorithm of blind estimation of time offset is proposed for PCC- OFDM with overlapping symbol periods. The inherent severe ISI is eliminated by way of parallel interference cancellation. The variance of decoded signals is used to obtain the precise estimation. No training symbols, pilot or cyclic prefix extensions are required. Simulated under AWGN and Ricean channel,simulation results show the feasibility of the proposed algorithm.