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Robust Uniform Channel Decomposition and Power Allocation for MIMO Systems with Imperfect CSI

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Abstract

In point to point MIMO systems, uniform channel decomposition (UCD) has been proven to be optimal in bit error rate (BER) performance and strictly capacity lossless when perfect channel state information (CSI) are assumed to be available at both the transmitter and the receiver side. However, in practice, CSI can be obtained at the transmitter if there is reciprocity between the forward and reverse channels in time division duplex (TDD) systems or can be conveyed from the receiver to the transmitter via a feedback channel. In any case, channel estimation error is inevitable. In this paper, a novel robust UCD scheme and corresponding optimal robust power allocation are proposed, which are capable of improving the BER performance in the context of imperfect CSI compared with the conventional UCD scheme and the robust precoding scheme proposed by Amir D. Dabbagh and David J. Love. Simulation results show that the MIMO channel capacity of the proposed robust UCD scheme is higher than that of the conventional UCD scheme. By deriving and analyzing the MIMO channel capacity lower bound of the robust UCD scheme, we prove that our proposed robust UCD scheme is capacity lossless in a channel estimation error existing MIMO system.

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Authors and Affiliations

  1. Broadband Wireless Communications Laboratory, Information Science Institute, State Key Laboratory of Integrated Service Networks, Xidian University, Xian, China

    Rui Chen, Jiandong Li, Wei Liu, Dan Chen & Leifang Hui

  2. School of Electronics and Computer Science, University of Southampton, Southampton, SO17 1BJ, UK

    Wei Liu

  3. Wireless Networks Laboratory, University of Florida, Gainesville, FL, USA

    Leifang Hui

Authors
  1. Rui Chen
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  2. Jiandong Li
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  3. Wei Liu
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  4. Dan Chen
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  5. Leifang Hui
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Correspondence to Rui Chen.

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Chen, R., Li, J., Liu, W. et al. Robust Uniform Channel Decomposition and Power Allocation for MIMO Systems with Imperfect CSI. Wireless Pers Commun 64, 761–781 (2012). https://doi.org/10.1007/s11277-010-0218-y

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  • DOI: https://doi.org/10.1007/s11277-010-0218-y

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