NDLI: Iterative vector channel estimation/MAP/PIC for CDMA systems in time-selective correlated multipath fading channels

Content Provider	IEEE Xplore Digital Library
Author	Shu-Ming Tseng
Copyright Year	1972
Abstract	Recently, Gao et al. proposed the expectation-maximization (EM) vector channel estimation for single-user direct-sequence code-division multiple-access (DS-CDMA) systems to estimate the correlated fading channel coefficients of the paths of a user. They also used one D-lag decision-feedback maximum a posteriori (MAP) detector to detect the information bits. A straightforward extension (noniterative) to multiuser synchronous CDMA cases, i.e., adding the parallel interference cancellation (PIC) multiuser detector into their scheme, results in poor performance. Therefore, we propose an iterative scheme which combines vector channel estimation, decision-feedback MAP detection, and PIC. The partial PIC is applied in the sequence hypothesis stage of MAP in each iteration before the final MAP decision. The proposed scheme has twice the decision delay of the previous scheme for single-user cases. The performance of the proposed system in the time-selective, correlated multipath fading channel environment is investigated. Simulation results show that the proposed scheme significantly outperforms the noniterative scheme. Simulation results also show that the proposed scheme performs better than its scalar channel-estimation version.
Starting Page	614
Ending Page	618
Page Count	5
File Size	198763
File Format	PDF
ISSN	00906778
Volume Number	54
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel estimation Multiaccess communication Fading Detectors Delay Multiple access interference Interference cancellation Iterative algorithms Multiuser detection Demodulation vector channel estimation Code-division multiple access (CDMA) iterative algorithms multiuser detection
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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