本振相位噪声对数字接收机的影响

Effects of Phase Noise of Local Oscillator on the Performance of Receivers

在现代接收机中,各种高性能如大动态、高选择性等都受相位噪声限制。尤其在目前电磁环境越来越恶劣的情况下,接收机经过混频从强干扰信号中提取弱小有用信号是非常重要的。文章搭建了本振的中频模型,分别建立了BPSK和伪码调制的信号模型,并使用Matlab编程仿真,研究了本振相位噪声对数字接收机性能的影响。

In modern receivers,high performances such as great dynamics,high selectivity are restricted by the phase noise.Especially in current situations where the EMC environments become worse and worse.It is very important for receivers to pick up relatively weak but useful signals from the strong interfering signals by mixing.The intermediate frequency mathematical model of oscillator in set up in this article,with the signal models of BPSK code and CA code.They are programmed and simulated with Matlab,followed by analysis of effects of LO noise on receiver performance.