Nonstationary interference suppression in spread spectrum communication systems
Moeness G. Amin · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2002
This paper discusses nonstationary interference excision techniques in spread spectrum communications systems. Excision techniques to remove, or at least suppress, sinusoidal, auto-regressive, and digital communication signals have matured relative to those dealing with nonstationary interferers. Time-frequency domain methods for analysis and estimation of the frequency modulated (FM) interference are summarized. Domains other than time and frequency, such as the Gabor-domain, the Wavelet-domain, and quadratic time-frequency signal representations, are appropriate for non-traditional smart jamming in which the interference parameters are highly dependent on time. Excision methods can be linear, bilinear, or nonlinear with performance dependent on the interference power relative to the desired signal and noise. The receiver SINR expressions and curves are presented in this paper for some of the key interference excision techniques.