Decision-feedback MAP receiver for time-selective fading CDMA channels

Author

Wong, Tan F. ; Zhang, Qian ; Lehnert, James S.

Author_Institution

Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA

Volume

48

Issue

5

fYear

2000

fDate

5/1/2000 12:00:00 AM

Firstpage

829

Lastpage

840

Abstract

A decision-feedback maximum a posteriori (MAP) receiver is proposed for code-division multiple-access channels with time-selective fading. The receiver consists of a sequence-matched filter and a MAP demodulator. Output samples (more than one per symbol) from the matched filter are fed into the MAP demodulator. The MAP demodulator exploits the channel memory by delaying the decision and using a sequence of observations. This receiver also rejects multiple-access interference and estimates channel fading coefficients implicitly to give good demodulation decisions. Moreover, computer simulations are performed to evaluate the bit-error rate performance of the receiver under various channel conditions

Keywords

Monte Carlo methods; code division multiple access; demodulators; error statistics; fading channels; feedback; interference suppression; matched filters; multiuser channels; personal communication networks; radio receivers; radiofrequency interference; spread spectrum communication; BER; DS-CDMA; MAP demodulator; Monte Carlo simulation; PCS; antenna arrays; bit-error rate performance; channel conditions; channel fading coefficients estimation; channel memory; code-division multiple-access; computer simulations; decision-feedback MAP receiver; demodulation decisions; matched filter; maximum a posteriori receiver; multiple-access interference rejection; output samples; personal communication systems; receiver; sequence-matched filter; spatial diversity; time-selective fading CDMA channels; Computer simulation; Delay; Demodulation; Fading; Matched filters; Maximum likelihood estimation; Multiaccess communication; Multiple access interference; Narrowband; Performance evaluation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.843196

Filename

843196