Joint MMSE Transceiver Designs for MIMO AF Relaying Systems With Direct Link

In this paper, we provide minimum mean-squared error-based source-relay-destination transceiver designs for multiple-input multiple-output amplify-and-forward relaying systems, where direct link between the source and the destination is non-negligible. In an earlier work, a local optimal technique w...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2017-06, Vol.16 (6), p.3547-3560
Main Authors: Kong, Han-Bae, Shin, Hun Min, Oh, Taeseok, Lee, Inkyu
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Algorithms
Amplification
Complexity
Complexity theory
Computer simulation
Design engineering
direct link
Exact solutions
Feasibility
Iterative methods
Mathematical models
MIMO
MIMO (control systems)
MIMO systems
MMSE
Optimization
Relay
Relaying
Relays
Robustness
Searching
transceiver design
Transceivers
Wireless communication
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Summary:In this paper, we provide minimum mean-squared error-based source-relay-destination transceiver designs for multiple-input multiple-output amplify-and-forward relaying systems, where direct link between the source and the destination is non-negligible. In an earlier work, a local optimal technique was introduced which employs a projected gradient method and an interior point method. Since these methods may have quite high computational complexity, we investigate a new local optimal solution for the source-relay-destination transceiver which has low complexity. To this end, we first introduce the optimal closed-form solution for the relay transceiver for given source and destination filters. Then, for given relay and destination transceivers, the optimal source precoder design is derived, which requires only 1-D bisection search. Based on these solutions, we propose a joint optimization algorithm which iteratively finds a local optimal solution. Also, we introduce a simple non-iterative algorithm which computes filters in closed-forms with low complexity. Furthermore, since perfect channel knowledge may not be feasible in practical systems, a joint transceiver technique which is robust to channel uncertainties is provided. It is confirmed by simulation results that the proposed schemes outperform conventional techniques with significantly reduced complexity.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2017.2684122