Low-complexity multiuser MIMO downlink system based on a small-sized CQI quantizer
- Authors
- Song, Jiho; Lee, Jong-Ho; Kim, Seong-Cheol; Kim, Younglok
- Issue Date
- 2012
- Publisher
- SPRINGER INTERNATIONAL PUBLISHING AG
- Citation
- EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING, pp.1 - 15
- Journal Title
- EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING
- Start Page
- 1
- End Page
- 15
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/17540
- DOI
- 10.1186/1687-1499-2012-36
- ISSN
- 1687-1499
- Abstract
- It is known that the conventional semi-orthogonal user selection based on a greedy algorithm cannot provide a globally optimal solution due to its semi-orthogonal property. To find a more optimal user set and prevent the waste of the feedback resource at the base station, we present a multiuser multiple-input multiple-output system using a random beamforming (RBF) scheme, in which one unitary matrix is used. To reduce feedback overhead for channel quality information (CQI), we propose an efficient CQI quantizer based on a closed-form expression of expected SINR for selected users. Numerical results show that the RBF with the proposed CQI quantizer provides better throughput than conventional systems under minor levels of feedback.
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