在无线通信系统中, 调制解调技术的好坏很大程度上决定了通信的质量, QPSK 的调制技术在数字通信中占着非常重

要的地位, 这种调制方式具有优越的性能, 在无线通信系统中被广泛应用。-In a wireless communication system, modulation and demodulation techniques is good or bad largely determines the quality of communication, QPSK modulation techniques occupied a very important position in digital communications, this modulation has superior performance in wireless communication systems are widely used.