说明：  该程序计算了2*2的MIMO信道在瑞利衰落下、BPSK调制下迫零均衡的误比特率，并有理论值和仿真值的对比
(The program calculates the bit error rate of 2* 2 MIMO channel in Rayleigh fading, BPSK modulation, the zero forcing equalizer, and a comparison of the theoretical values ​ ​ and simulation values)