DocumentCode :
1106250
Title :
Adaptive parameter estimation using parallel Kalman filtering for spread spectrum code and Doppler tracking
Author :
Iltis, Ronald A.
Volume :
42
Issue :
6
fYear :
1994
fDate :
6/1/1994 12:00:00 AM
Firstpage :
2227
Lastpage :
2230
Abstract :
We present a new digital direct-sequence (DS) receiver with joint estimation of code delay, multipath gains and Doppler shift. A parameter estimator consisting of a parallel bank of extended Kalman filters (EKF´s) extracts estimates of the timing, τ and the multipath coefficients, fl distorting the received signal. A “detected” estimate of the Doppler shift, vr distorting the received signal is also provided by the estimator. We compute the bit error rate that results when a RAKE matched filter uses the estimated parameters to detect the DPSK encoded binary data in the received signal. The bit-error rate (BER) is evaluated, and successful performance of the proposed receiver in the presence of Doppler shift distortion is observed in many cases. We demonstrate that the receiver can operate when the multipath coefficients vary in time (Doppler spread)
Keywords :
Doppler effect; Kalman filters; adaptive filters; coding errors; matched filters; parameter estimation; phase shift keying; radio receivers; spread spectrum communication; BER; DPSK encoded binary data; Doppler shift distortion; Doppler spread; Doppler tracking; RAKE matched filter; adaptive parameter estimation; bit error rate; code delay; digital direct-sequence receiver; extended Kalman filters; joint estimation; multipath coefficients; multipath gains; parallel Kalman filtering; received signal; spread spectrum code; timing; Adaptive filters; Bit error rate; Delay estimation; Distortion; Doppler shift; Filtering; Kalman filters; Parameter estimation; RAKE receivers; Timing;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/26.293672
Filename :
293672
Link To Document :
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