相位噪声对PSK系统性能的影响

在介绍相位噪声定义的基础上，分析了相移键控（PSK）接收系统的本振信号源相 位噪声对误码率的影响。以QPSK调制方式为例，仿真了相位噪声对系统误码率影响， 结果证明了接收系统中本振信号源相位噪声的重要性。以实际工程中使用的本振 信号源为例，推导了相位噪声和信号抖动所导致的BPSK和QPSK接收系统信噪比的限制。理论 分析与工程实践相结合，可以更好地得出相位噪声对PSK接收系统的影响，对接收系统的工 程设计具有一定的指导意义。

Effects of Phase Noise on the Performance of a PSK System

According to the concept of phase noise, this paper analyses the effect of LO(Local Oscillator) signal source phase noise on bit error rate (BER) performance of a phase shift keying (PSK) communication system. A quadrature phase shift keying(QPSK) system example is used to predict the effect of phase noise on BER.Simulation result s prove that the phase noise of LO is important in a re ceiver system.Taking the LO signal source used in engineering as example,the Sig nal-to-Noise Ratio(SNR) limitation of BPSK or QPSK receiver system due to phase noise and jitter is derived.The research has significance in engineering-oriente d application of recei ver system.