Joint MMSE Transceiver Designs for MIMO AF Relaying Systems With Direct Link
- Authors
- Kong, Han-Bae; Shin, Hun Min; Oh, Taeseok; Lee, Inkyu
- Issue Date
- Jun-2017
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- MIMO systems; transceiver design; relay; MMSE; direct link
- Citation
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.16, no.6, pp.3547 - 3560
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
- Volume
- 16
- Number
- 6
- Start Page
- 3547
- End Page
- 3560
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/83281
- DOI
- 10.1109/TWC.2017.2684122
- ISSN
- 1536-1276
- Abstract
- 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.
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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