Robust ARQ Precoder Optimization for AF MIMO Relay Systems with Channel Estimation Errors

In this paper, we consider the robust retransmission precoder design for amplify-and-forward (AF) multi-input multi-output (MIMO) relay systems with channel estimation errors. With the objective of minimizing the average mean-squared-error of symbol estimations, we propose a novel progressive retran...

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Veröffentlicht in:IEEE transactions on wireless communications Jg. 12; H. 10; S. 5236 - 5247
Hauptverfasser: Zhang, Zhengyu, Xu, Jie, Qiu, Ling
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY IEEE 01.10.2013
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Access methods and protocols, osi model
Algorithms
Amplify-and-forward (AF) multi-input multi-output (MIMO) relay
Applied sciences
ARQ
Automatic repeat request
Channel estimation
channel estimation error
Detection, estimation, filtering, equalization, prediction
Exact sciences and technology
Information, signal and communications theory
Magnetic resonance
mean-squared-error
MIMO
Operations research
Optimization
Receivers
Relays
robust precoder design
Robustness
Signal and communications theory
Signal, noise
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Transmission and modulation (techniques and equipments)
Performance evaluation
ARQ
Parameter estimation
Relay
mean-squared-error
Error estimation
Amplify-and-forward (AF) multi-input multi-output (MIMO) relay
Iterative method
Power supply
Optimization
Mean square error
Degradation
Channel estimation
Routing protocols
Damaging
Matrix diagonalization
MIMO system
Estimation error
Optimal algorithm
Coding circuit
Transmission protocol
robust precoder design
channel estimation error
Necessary condition
Relay channel
Optimal solution
Optimality criterion
Automatic repeat request
ISSN:1536-1276, 1558-2248
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Zusammenfassung:In this paper, we consider the robust retransmission precoder design for amplify-and-forward (AF) multi-input multi-output (MIMO) relay systems with channel estimation errors. With the objective of minimizing the average mean-squared-error of symbol estimations, we propose a novel progressive retransmission precoder by employing matrix diagonalization and channel pairing. As a consequence, we formulate the precoder design as a joint source/relay power allocation (PA) and channel pairing optimization problem. First, we propose the globally optimal solution, in which exhaustive search is employed for the channel pairing, while with each given channel pairing, an optimal PA algorithm is proposed to solve the nonconvex PA problem by utilizing the necessary conditions for optimality. However, the optimal channel pairing and PA solution is of very high complexity. In order to reduce the complexity, we then propose a suboptimal PA algorithm by iteratively optimizing the PA at the source and the relay, as well as a simplified channel pairing searching method based on the asymptotic optimal solution. It is shown that our proposed robust retransmission precoder improves the system performance significantly, meanwhile, the performance degradation of the low complexity PA and channel pairing algorithm is slight as compared to the optimal PA algorithm and the optimal channel pairing method.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2013.090313.130090