Robust Optimization of Linear Precoders/Decoders for Multiuser MIMO Downlink with Imperfect CSI at Base Station

A robust scheme is proposed to optimize the linear precoders/decoders for MIMO downlinks where the available channel state information (CSI) at base station (BS) is imperfect. The objective is to minimize the sum mean square error (SMSE) over all data sub-streams under a per-user transmit power cons...

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Published in:2007 IEEE Wireless Communications and Networking Conference pp. 1129 - 1133
Main Authors: Hao Li, Changqing Xu
Format: Conference Proceeding
Language:English
Published: IEEE 01.03.2007
Subjects:
Base stations
Channel state information
Downlink
Iterative algorithms
Iterative decoding
Mean square error methods
MIMO
Performance loss
Robustness
Throughput
ISBN:1424406587, 9781424406586
ISSN:1525-3511
Online Access:Get full text
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Abstract A robust scheme is proposed to optimize the linear precoders/decoders for MIMO downlinks where the available channel state information (CSI) at base station (BS) is imperfect. The objective is to minimize the sum mean square error (SMSE) over all data sub-streams under a per-user transmit power constraint. By using an iterative procedure, the proposed scheme extends the existing optimization algorithm for the single-user MIMO system with perfect CSI to solve approximately the minimizing SMSE problem in the multiuser MIMO downlink with imperfect CSI at BS. Simulation results demonstrate that the proposed scheme can effectively mitigate the performance loss induced by the imperfect CSI and can provide largest possible diversity as well as increased throughput.
AbstractList A robust scheme is proposed to optimize the linear precoders/decoders for MIMO downlinks where the available channel state information (CSI) at base station (BS) is imperfect. The objective is to minimize the sum mean square error (SMSE) over all data sub-streams under a per-user transmit power constraint. By using an iterative procedure, the proposed scheme extends the existing optimization algorithm for the single-user MIMO system with perfect CSI to solve approximately the minimizing SMSE problem in the multiuser MIMO downlink with imperfect CSI at BS. Simulation results demonstrate that the proposed scheme can effectively mitigate the performance loss induced by the imperfect CSI and can provide largest possible diversity as well as increased throughput.
Author Hao Li
Changqing Xu
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  organization: Dept. of Electron. Eng., Shanghai Jiaotong Univ
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Snippet A robust scheme is proposed to optimize the linear precoders/decoders for MIMO downlinks where the available channel state information (CSI) at base station...
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StartPage 1129
SubjectTerms Base stations
Channel state information
Downlink
Iterative algorithms
Iterative decoding
Mean square error methods
MIMO
Performance loss
Robustness
Throughput
Title Robust Optimization of Linear Precoders/Decoders for Multiuser MIMO Downlink with Imperfect CSI at Base Station
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