A Variable Step Frequency-Domain LMS Narrowband Interference Suppression Algorithm Based on Adaptive Noise Statistics

In the inter-satellite communication system, the power of spread spectrum signal received by the receiving end has a large dynamic range due to the large distance between the senders and receivers. In order to ensure the stability of AD sampling data, it usually adds AGC in the RF channel to make the output of the IF signal power stable, and does not change along with the change of the input signal power. It also leads to a problem that the proportion of the effective signal (the number of bits) after AD sampling reduced with the increase of the interference signal power, thus affecting the anti-jamming performance of the fixed-step frequency domain LMS algorithm. Aiming at the above problems, this paper proposes a variable step frequency domain LMS narrowband interference suppression algorithm which based on adaptive noise statistics. In this paper, the simulation results show that the proposed approach can effectively solve the above problems.