用burg算法实现功率谱的估计，可以改变信噪比SNR，阶次P，可以分析分辨率

通过MATLAB软件；通过仿真得出性能曲线；从而比较bpsk的性能-The bit-error rate (BER) of binary phase-shift keying in Rayleigh fading, using the Alamouti transmission scheme and receiver selection diversity in the presence of channel-estimation error, is studied. Closed-

Calculating the SNR with NLMS