此例程为配套书籍的第六章例题7-19的相对应代码，功能为QPSK调制与解调，编程环境为matlab。-This routine supporting books Chapter Example 7-19 corresponding to the code for the function QPSK modulation and demodulation, programming environment Matlab.

QPSK码型变换，调制解调及附加加性高斯白噪声的误码分析-Error Analysis QPSK code pattern conversion, modulation and demodulation and additional additive white Gaussian noise