A CCD Implemented Adaptive Filter for Estimation and Suppression of Narrowband Interference in a PN Spread Spectrum Receiver

Analytical results have shown that adaptive filtering can be a powerful tool for the rejection of narrowband interference in a spread spectrum receiver. However, the complexity of adaptive filter hardware has stymied the experimental verification of these results. This paper describes a 16-tap LMS adaptive filter which uses a burst processing technique to obtain both hardware savings and simplification in implementation. The suppression of a single tone jammer in a direct sequence spread spectrum receiver is investigated, and a probability of error curve demonstrating quantitatively the effectiveness of the adaptive filter is presented.