Effect of Synchronization Deviation on The Performance of PSWFs Non-sinusoidal Communication System

摘要

As a non-sinusoidal modulation, the time domain orthogonal modulation based on the Prolate Spheroidal Wave Functions (PSWFs) has the advantages of high spectral efficiency and high power utilization rate. However, in actual wireless communication systems, there are always non-ideal interferences such as synchronization deviation, multipath propagation, Doppler frequency shift. These factors have a serious impact on the performance of non-sinusoidal communication systems based on PSWFs. In this paper, from two aspects of frequency synchronization offset and symbol synchronization offset, the effect of synchronization error on the performance of non-sinusoidal communication system based on PSWFs is studied. Through theoretical analysis and simulation analysis, the results show that although the PSWFs signal has the best time-frequency energy aggregation characteristics, its Inter Carrier Interference (ICI) and Inter Symbol Interference (ISI) capabilities are relative. When there is synchronization frequency offset and time offset in the system, there are serious symbol interference and carrier interference in the PSWFs modulated signal. To ensure the system performance, the synchronization error needs to be eliminated or effectively reduced.