MPPSK接收机位同步实现

Phase Synchronization in MPPSK Receiver

摘要: 鉴于多元位置相移键控(MPPSK)是一种基于位置的调制方式，在硬件解调器中相位同步尤为重要。本文提出一种MPPSK信号解调器的位同步方式，将利用MPPSK调制自身的信号特性实现同步，核心在于找到每个符号周期的起始位置，将MPPSK的调制位置定位到正确的判决区间中，并利用解调信号的反馈对接收信号进行实时相位微调，尤其在非整数倍采样时，能消除因采样点个数取整而引入的相位偏差。

Abstract: As M-ary Position Phase Shift Keying (MPPSK) is a phase-based modulation and phase synchroni-zation is particularly important in actual demodulation system. This paper presents a method of phase synchronization using signal characteristics of MPPSK modulation. The key step is to find the beginning of each symbol period, which will help to locate the correct decision interval and conduct the real-time phase trimming with feedback of demodulated signal. This method can eliminate phase deviation especially in the case of non-integer multiple sampling.