在matlab环境下实现通信系统中的BPSK，QPSK，16QAM，调制。成型滤波和匹配滤波都采用根升余弦函数。-In the matlab environment to achieve communication system BPSK, QPSK, 16QAM, modulation. Shaping filter and matched filter are used root raised cosine function.

QPSK的调制与解调仿真，包含内插、成形滤波、匹配滤波等过程-modulation and demodulation of QPSK

1.先运行2_28_1再运行3_3_1判断PSK调制方式，得到精确频偏以及符号速率（这里只针对QPSK） 2.根据精确载频以及符号速率运行3_3_2进行匹配滤波 3. 3_3_2进行QPSK解调 4. 未给定信号-1. First Run 2_28_1 run 3_3_1 judge PSK modulation scheme to obtain accurate frequency offset and symbol rate (here only for QPSK) 2. dep