Title :
Trellis-based multiuser detection for DS-CDMA systems in mismatched asynchronous flat-fading channels
Author :
Chu, Li-Chung ; Mitra, Urbashi
Author_Institution :
Dreese Lab., Columbus, OH, USA
Abstract :
The problem of multi-user detection in direct-sequence code-division multiple-access systems with channel state mismatch is addressed. An approximate maximum-likelihood criterion is derived based on knowledge of the statistical properties of the residual channel estimation errors. The time of arrival is assumed to be a constant during the time frame of interest. Errors in both timing information and fading coefficient information are assumed. A Viterbi-like recursive demodulation scheme is derived and analyzed. The performance of the new algorithm is studied via simulation and the development of performance bounds
Keywords :
AWGN channels; Viterbi detection; code division multiple access; demodulation; error statistics; fading channels; filtering theory; matched filters; maximum likelihood detection; multiuser channels; parameter estimation; signal sampling; spread spectrum communication; timing; AWGN channels; DS-CDMA systems; Viterbi-like recursive demodulation; algorithm; algorithm performance; approximate maximum-likelihood criterion; channel state mismatch; direct-sequence code-division multiple-access; fading coefficient information; matched filter output; mismatched asynchronous flat-fading channels; nonuniform sampling; pairwise error probability; performance bounds; residual channel estimation errors; simulation; statistical properties; time of arrival; timing information; trellis-based multiuser detection; AWGN; Detectors; Fading; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Multiuser detection; Parameter estimation; Signal processing; Timing;
Conference_Titel :
Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5668-3
DOI :
10.1109/WCNC.1999.796867
