Multistage decision-directed channel estimation scheme for DS-CDMA system with M-ary orthogonal signaling

A multistage decision-directed channel estimation scheme is proposed for a coherent direct-sequence code-division multiple-access (DS-CDMA) system with M-ary orthogonal signaling. The receiver with a multistage decision-directed channel estimator makes alternate use of symbol detection and channel e...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2000-01, Vol.49 (1), p.43-49
Main Authors: Park, Byeong Hoon, Kim, Ki Jun, Kwon, Soon-Yil, Whang, Keum Chan
Format: Article
Language:English
Subjects:
Applied sciences
Bit error rate
Channel estimation
Channels
Codes
Coherence
Decisions
Degradation
Demodulation
Detectors
Diversity reception
Estimates
Estimators
Exact sciences and technology
Iterative methods
Maximum likelihood estimation
Multiaccess communication
Multistage
Optimization
Personal communication networks
Symbols
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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Summary:A multistage decision-directed channel estimation scheme is proposed for a coherent direct-sequence code-division multiple-access (DS-CDMA) system with M-ary orthogonal signaling. The receiver with a multistage decision-directed channel estimator makes alternate use of symbol detection and channel estimation in an iterative manner, resulting in a multistage structure where each stage consists of an estimator and a detector. The estimator obtains the estimates of the channel by using the decisions from the detector in the previous stage, and the detector uses these estimates for coherent detection of the transmitted symbols. Modifications to the process of generating the channel estimates and the decision variables are made to mitigate the error propagation in successive stages. It is shown that the performance of the proposed estimation scheme is better than the conventional scheme, especially for channels with high diversity order. The gain is mostly achieved by two stages for channels with low diversity order and by five stages for channels with high diversity order. The proposed scheme can be used to increase the capacity of DS-CDMA systems currently operating in such environments.
ISSN:0018-9545
1939-9359
DOI:10.1109/25.820697