DocumentCode :
1254907
Title :
Performance analysis of instantaneous frequency-based interference excision techniques in spread spectrum communications
Author :
Wang, Chenshu ; Amin, Moeness G.
Author_Institution :
GlobeSpan Technol. Inc., Red Bank, NJ, USA
Volume :
46
Issue :
1
fYear :
1998
fDate :
1/1/1998 12:00:00 AM
Firstpage :
70
Lastpage :
82
Abstract :
Jammers characterized by their instantaneous frequencies can be effectively mitigated in direct sequence spread spectrum communications by using open-loop adaptive excision filters. The primary requirement for these filters is that they must possess a notch in tune with the jammer instantaneous frequency (IF) to annihilate the interference power at every time sample. The interference time-varying frequency can be obtained using existing IF estimators, including quadratic time-frequency distribution methods. Without focusing on any specific estimator, we develop expressions for the receiver performance using a general class of multiple-zero FIR excision filters and show the dependence of the bit error rate (BER) on the filter order and its group delay. The effect of inaccuracies in the jammer instantaneous frequency information on the receiver performance is considered and evaluated as a function of the filter notch bandwidth. The latter is defined by the filter zero multiplicity, which is shown to be an important factor in the analysis of the correlator signal-to-noise ratio (SNR)
Keywords :
FIR filters; adaptive filters; error statistics; interference suppression; jamming; notch filters; pseudonoise codes; radio receivers; spread spectrum communication; IF estimators; bit error rate; correlator signal-to-noise ratio; direct sequence spread spectrum communications; filter notch bandwidth; filter order; filter zero multiplicity; group delay; instantaneous frequencies; instantaneous frequency-based interference excision techniques; interference power; interference time-varying frequency; jammers; multiple-zero FIR excision filters; open-loop adaptive excision filters; performance analysis; quadratic time-frequency distribution methods; receiver performance; spread spectrum communications; Adaptive filters; Bit error rate; Delay estimation; Finite impulse response filter; Frequency estimation; Interference; Jamming; Performance analysis; Spread spectrum communication; Time frequency analysis;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/78.651179
Filename :
651179
Link To Document :
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