A New Beamforming Structure Based on Transmit-MRC for Closed-Loop MIMO Systems
- Authors
- Park, Seok-Hwan; Lee, Heunchul; Lee, Sang-Rim; Lee, Inkyu
- Issue Date
- 6월-2009
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Closed-loop multiple-input multiple-output (MIMO) systems; transmit beamforming
- Citation
- IEEE TRANSACTIONS ON COMMUNICATIONS, v.57, no.6, pp.1847 - 1856
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON COMMUNICATIONS
- Volume
- 57
- Number
- 6
- Start Page
- 1847
- End Page
- 1856
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/119940
- DOI
- 10.1109/TCOMM.2009.06.070520
- ISSN
- 0090-6778
- Abstract
- This paper proposes an efficient beamforming scheme which attains optimality as singular value decomposition (SVD) based systems with low complexity utilizing transmit maximum-ratio combining (TMRC) techniques. The TMR scheme is the optimum structure for single beamforming systems in terms of received signal-to-noise ratio (SNR) in multiple-input single-output (MISO) channels. In this paper, we generalize the TMRC scheme to multiple beamforming multiple-input multiple-output (MIMO) systems which support more than one data stream in coded systems. We express each beamforming vector as a linear combination of TMRC vectors whose coefficients are optimized in a successive manner. Optimization of the beamforming vector is followed by the decorrelation process. All TMRC vectors used as a basis of the remaining beamforming vectors are made orthogonal to previously computed beamforming vectors. Exploiting the concept of the gradient ascent algorithm, we propose a simple non-iterative method of computing the precoder which obtains the near optimal performance. Also we derive a closed form expression of the output SNR distribution for the proposed scheme. Simulation results demonstrate that the proposed scheme achieves the almost identical link performance as the SVD-based system for arbitrary configurations with reduced complexity.
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