Title :
Multiuser detectors with single-user parameter estimation on quasi-synchronous CDMA channels
Author :
Mailaender, Laurence ; Iltis, Ronald A.
Author_Institution :
Bell Labs., Lucent Technol., Holmdel, NJ, USA
fDate :
2/1/2000 12:00:00 AM
Abstract :
We present simulated error rate and code delay/amplitude tracking performance for two recently developed detectors: the adaptive whitened matched filter, and the quasi-synchronous decorrelator. Rapid convergence (within 50 symbols) of the estimated amplitude and delay of the desired user is demonstrated based on an approximate joint maximum likelihood approach. The adaptive whitened matched filter exhibits better bit error rate performance than the decorrelator, but requires a complex eigenanalysis stage
Keywords :
amplitude estimation; code division multiple access; convergence of numerical methods; delay estimation; eigenvalues and eigenfunctions; error statistics; filtering theory; matched filters; maximum likelihood estimation; multiuser channels; signal detection; spread spectrum communication; AWGN channel; BER; BPSK; adaptive whitened matched filter; additive white Gaussian noise channel; amplitude estimation; approximate joint maximum likelihood; bit error rate performance; code delay/amplitude tracking performance; convergence; decorrelator; delay estimation; eigenanalysis; linear detectors; multiuser detectors; noise covariance matrix; quasi-synchronous CDMA channels; quasi-synchronous decorrelator; simulated error rate; single-user parameter estimation; spreading codes; uncoded binary phase-shift keying; Amplitude estimation; Convergence; Decorrelation; Delay estimation; Detectors; Error analysis; Matched filters; Maximum likelihood detection; Maximum likelihood estimation; Parameter estimation;
Journal_Title :
Communications, IEEE Transactions on
