Unintended Interference Suppression Based on Decision Feedback Adaptive Cancellation for DSSS Satellite Communication

Abstract

Considering the non-spread spectrum interference in overlapping frequency domain for direct-sequence spread spectrum (DSSS) satellite communication, the unintended strong interference suppression method based on adaptive cancellation with decision feedback is proposed. Firstly, the model of adaptive cancellation with decision feedback is built by making the best of interference modulation mode and bandwidth. Secondly, the adaptive cancellation based on polynomial nonlinear reconstruction model is analyzed in theory, and the mathematical expression of interference suppression ratio is derived. Finally, the proposed method is simulated under different parameters. The theory analysis and simulation results both show that this method can achieve more than 4.5 dB transmission link processing gain to efficiently suppress the overlapping unintended interference.