Implementation of a DS-Spread Spectrum Intercept Receiver with an Adaptive Narrow-Band Interference Exciser using Transform Domain Processing and Time Weighting

Abstract

This paper describes detection of DS-BPSK signals in the presence of narrowband interference (CW) where transform domain processing is employed for detection and excision of the narrowband interference. The receiver rejects the interference by performing a real-time Fourier transformation followed by tracking and excision. This, in turn, is followed by inverse transformation and energy detection. To further improve the narrowband interference excision, the received signal is time weighted. Using weighting together with excision, one obtains about 12 dB additional reduction of the interference power at the output of the receiver over and above what one would achieve by using the system without weighting.