Impacts of Phase Noise on the Performance of Adaptive Side-lobe Cancellation System

摘要

Adaptive side-lobe cancellation (SLC) is an effective means of anti-jamming in communication systems. To realize SLC in digital domain, down-conversion is required to convert the signals into baseband. However, down-conversion circuits introduce phase noise into the output signals, which degrades the SLC performance. This paper establishes new mathematical models of SLC taking into account phase noise to quantify the impacts of phase noise of different levels. The theoretical models are verified by simulations. The simulation results show that phase noise is a critical factor that limits the interference cancellation ratio (ICR) of SLC. In addition, the effect of phase noise is not related with the specific form of the received signals, but only the level of phase noise. The theoretical models in our paper can be used to find the required phase noise levels to meet the required SLC performance.