Title :
Adaptive jammer suppression using decision feedback in a spread-spectrum receiver
Author :
Shah, Biren ; Saulnier, Gary J.
Author_Institution :
Dept. of Electr., Comput., & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA
Abstract :
The authors compare the performance of three least-mean-square (LMS) adaptive structures which supplement direct-sequence (DS) spread-spectrum techniques in the suppression of jammers. In addition to a single-input LMS adaptive structure without decision feedback, two LMS structures which use decision feedback are evaluated. Probability-of-error results are presented, and convergence properties are investigated. It is concluded that LMS adaptive filtering improves the probability-of-error performance of a DS spread-spectrum system operating in the presence of stationary single-tone jammers. It is also shown that when compared with the no feedback case, LMS adaptive systems with decision feedback do not degrade probability of error performance; however, decision feedback does not always appreciably improve system error rates.<>
Keywords :
filtering and prediction theory; interference suppression; jamming; least squares approximations; radio receivers; spread spectrum communication; LMS adaptive filtering; LMS adaptive structures; adaptive jammer suppression; convergence properties; decision feedback; direct sequence spread spectrum; error performance; error probability; least-mean-square; spread-spectrum receiver; stationary single-tone jammers; system error rates; AWGN; Adaptive filters; Additive white noise; Bandwidth; Convergence; Feedback; Jamming; Least squares approximation; Narrowband; Spread spectrum communication;
Conference_Titel :
Military Communications Conference, 1988. MILCOM 88, Conference record. 21st Century Military Communications - What's Possible? 1988 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/MILCOM.1988.13509
