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π／4DQSPK是一种适合于移动通信和个人通信系统的调制技术，由于其优越的性能，已被美国和日本数字蜂窝移动通信系统所采用，本文介绍了π／4DQPSK及其改进形π／4CTPSK的调制解调方法，并从功率谱特性和误码性能两个方面对它们进行了比较。
π / 4DQSPK is a modulation technique suitable for mobile communication and personal communication systems. Due to its superior performance, π / 4DQSPK has been adopted by digital cellular mobile communication systems in the United States and Japan. This paper introduces π / 4DQPSK and its improved π / 4CTPSK The modulation and demodulation method, and from the power spectral characteristics and error performance of the two aspects of them were compared.