基于OFDM的WLAN相位校正算法研究

A phase correction algorithm for OFDM-based WLANs

相位校正对基于OFDM的高速数据传输系统至关重要。文章针对802.11a协议提出了一种使用导频进行相位校正的算法。该算法对接收导频样本进行最小二乘估计以获得相偏参数,算法综合考虑了抽样时钟偏移(SCO)和载波频偏(CFO)所引起的相位偏移。文章通过仿真比较了该算法与另一种相位校正算法在不同参数下的性能,结果证明在相偏主要由SCO和CFO引起的情况下该算法性能较好。

Phase correction is essential to OFDM-based high-data-rate transmission system. A phase correction algorithm using pilots complying with IEEE 802.11 a standard is proposed. According to this algorithm, linear least square estimation is used to deduce phase offset parameters from pilot samples. It takes all the phase noise caused by sampling clock offset （SCO） and carrier frequency offset （CFO） into account. Simulations have been carried out to compare the performance of this algorithm with another phase correction algorithm under different parameters. Results show that this algorithm performs well when the phase offset is mainly caused by SCO and CFO.