Influence Analysis of Carrier Phase Noise on Modulation and Demodulation Performance in Satellite Communication Downlink

Abstract

In this paper, the influence of carrier phase noise on the performance of modulation and demodulation in satellite communication downlink is simulated and analyzed. The influence trend of carrier phase noise on demodulation of different sampling rates and symbol rates under specified modulation mode is elaborated. We have come to the conclusion that: the influence of carrier phase noise on performance of specified modulation mode is related to sampling rate and symbol rate, and is also closely related to parameter setting of receiving system. Therefore, if we want to restrict the influence of carrier phase noise of transmitter on final demodulation performance, we need to consider different code rates have different influence of the phase noise on the performance under specified modulation mode. Meanwhile, we need to consider the whole transmission link, not only the transmitter itself, but also the relevant design parameters (loop form, bandwidth setting and damping coefficient setting) of the receiving system should be carefully designed and constrained to minimize the influence of carrier phase noise on modulation and demodulation performance.