DocumentCode :
769533
Title :
Rejection of Pulsed CW Interference in PN Spread-Spectrum Systems Using Complex Adaptive Filters
Author :
Li, Loh-ming ; Milstein, Laurence B.
Author_Institution :
Chengdu Institute of Radio Engineering, Chengdu, China
Volume :
31
Issue :
1
fYear :
1983
fDate :
1/1/1983 12:00:00 AM
Firstpage :
10
Lastpage :
20
Abstract :
In this paper, the performance of direct sequence QPSK spread-spectrum systems using complex adaptive filters in the presence of pulsed CW interference is analyzed. Both adaptive prediction error filters and adaptive transversal filters with two-sided taps are considered. It is shown that the time constant of the tap weight adaptation in the interference off-interval is usually much greater than the time constant in the on-interval, and that this is beneficial for the system since it results in retaining the rejection property of the filter. Under steady-state conditions, the tap weights are calculated. Analytical expressions for the signal-to-noise ratio improvement under the least favorable interference condition are given. It is shown that the performance of the two-sided transversal filter is better than that of the prediction error filter.
Keywords :
Adaptive filters; Phase-shift keying; Prediction methods; Pseudonoise-coded communication; Transversal filters; Adaptive filters; Interference; Noise level; Performance analysis; Phase noise; Quadrature phase shift keying; Radio frequency; Spread spectrum communication; Steady-state; Transversal filters;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1983.1095722
Filename :
1095722
Link To Document :
بازگشت