该函数可以实现在mimo信号传输时的波束矩阵，尽可以实现在线性接收机的情况下可以达到最大似然的性能，从而大大简化接收机的设计。-This function can be achieved when the signal transmission in mimo beam matrix can make the case of linear receiver can achieve the maximum likelihood performance, which greatly simplify the receiver design.