中文说明：
对ofdm插入梳妆（comb)导频，比较了有ls信道估计和无信道估计，并仿真得到了不同信噪比下，误码率曲线；信道为多径瑞利衰落加上白噪声；经过调试，已经能正确运行。
English Description：
For OFDM with comb pilot, the LS channel estimation and no channel estimation are compared, and the BER curves under different SNR are obtained by simulation; The channel is multi-path Rayleigh fading with white noise; After debugging, it can run correctly