This paper discusses system aspects of adaptive filtering applied to narrowband interference rejection for direct sequence spread spectrum systems. Removal of strong CW interference can greatly improve the operation of downstream subsystems configured for detection of wideband signals. At the same time, the desired signal may undergo distortion due to the filter. The mechanism for that distortion is introduced, and the effects on system operation are shown.
Michael G. Price,
Michael H. Brill,
"Adaptive Optical Filtering: System Issues", Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); doi: 10.1117/12.946932; https://doi.org/10.1117/12.946932