A Simple Scheme for 2FSK Signal Extraction Based on Independent Component Analysis with Cosine Pulse Reference Signal

Abstract

In this paper, we propose a simple scheme for 2FSK signal extraction based on independent component analysis with reference (ICA-R) in noisy and disturbed channel condition, and only one of the two carrier frequencies of the source 2FSK signal is required as the a priori information to generate a cosine pulse signal as the reference signal at receiver. Simulations under various channel conditions, such as different jamming signal type, Signal-to-Jamming Ratio (SJR) and Signal-to-Noise Ratio (SNR), are carried out to investigate the effectiveness and extraction performance of the proposed method. The simulation results show that the proposed method takes a good extraction effect when the carrier frequency of the reference signal equals to either one of the two carrier frequencies of the source 2FSK signal, and the anti-noise performance under strong interference condition is almost the same with the theoretical result in A WGN channel. Moreover, the anti-jamming performance keeps well even when the SJR is as low as -50 dB. Besides, we find that the wrong convergence phenomenon results from the inherent threshold parameter problem in ICA-R is solved in our proposed scheme.