LMMSE估计就是MMSE算法的特例，通过求得一个合适的信道冲击响应（CIR），使得通过CIR计算出的接收数据与实际数据的误差的均方和最小。-LMMSE estimate is a special case of the MMSE algorithm, to obtain a suitable channel impulse response (CIR), so that the received data and the error of the actual data calculated