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

fYear

1999

fDate

1999

Firstpage

1134

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE

Conference_Location

New Orleans, LA

ISSN

1525-3511

Print_ISBN

0-7803-5668-3

Type

conf

DOI

10.1109/WCNC.1999.796867

Filename

796867