Zero-Forcing DFE Transceiver Design Over Slowly Time-Varying MIMO Channels Using ST-GTD

This paper considers the optimization of transceivers with decision feedback equalizers (DFE) for slowly time-varying memoryless multi-input multi-output (MIMO) channels. The data vectors are grouped into space-time blocks (ST-blocks) for the spatial and temporal precoding to take advantage of the d...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2010-11, Vol.58 (11), p.5779-5790
Main Authors: Chih-Hao Liu, Vaidyanathan, Palghat P
Format: Article
Language:English
Subjects:
Applied sciences
Arithmetic
Asymptotic properties
Bit error rate
Channel state information
Channels
Coding, codes
Decision feedback equalizers
Decomposition
Detection, estimation, filtering, equalization, prediction
Detectors
Equalizers
Exact sciences and technology
Feedback
Generalized triangular decomposition
GMD
Information, signal and communications theory
Mathematical analysis
MIMO
Miscellaneous
Signal and communications theory
Signal processing
Signal to noise ratio
Signal, noise
space-time GTD
Studies
Telecommunications and information theory
Time-varying channels
Transceivers
Transmitters
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Summary:This paper considers the optimization of transceivers with decision feedback equalizers (DFE) for slowly time-varying memoryless multi-input multi-output (MIMO) channels. The data vectors are grouped into space-time blocks (ST-blocks) for the spatial and temporal precoding to take advantage of the diversity offered by time-varying channels. The space-time generalized triangular decomposition (ST-GTD) is proposed for application in time-varying channels. Under the assumption that the instantaneous channel state information at the transmitter (CSIT) and receiver (CSIR), and the channel prediction are available, we also propose the space-time geometric mean decomposition (ST-GMD) system based on ST-GTD. Under perfect channel prediction, the system minimizes both the arithmetic MSE at the feedback detector, and the average un-coded bit error rate (BER) in moderate high signal to noise ratio (SNR) region. For practical applications, a novel ST-GTD based system which does not require channel prediction but shares the same asymptotic BER performance with the ST-GMD system is also proposed. At the moderate high SNR region, our analysis and numerical results show that all the proposed systems have better BER performance than the conventional GMD-based systems over time-varying channels; the average BERs of the proposed systems are non-increasing functions of the ST-block size.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2010.2066973