中文说明： 这个程序主要是仿真Alamouti 2发1收空时编码性能，数据的调制方式为QPSK，定义了Rayleigh衰落信道， 定义了Alamouti方案的判决变量等等。
English Description：
This program is mainly used to simulate Alamouti 2-transmitter-1-receiver space-time coding performance. The data modulation mode is QPSK, and the Rayleigh fading channel is defined,