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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.<\/jats:p>","DOI":"10.1186\/1687-1499-2012-36","type":"journal-article","created":{"date-parts":[[2012,2,8]],"date-time":"2012-02-08T06:14:29Z","timestamp":1328681669000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Low-complexity multiuser MIMO downlink system based on a small-sized CQI quantizer"],"prefix":"10.1186","volume":"2012","author":[{"given":"Jiho","family":"Song","sequence":"first","affiliation":[]},{"given":"Jong-Ho","family":"Lee","sequence":"additional","affiliation":[]},{"given":"Seong-Cheol","family":"Kim","sequence":"additional","affiliation":[]},{"given":"Younglok","family":"Kim","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2012,2,8]]},"reference":[{"issue":"6","key":"381_CR1","doi-asserted-by":"publisher","first-page":"1277","DOI":"10.1109\/TIT.2002.1003822","volume":"48","author":"P Viswanath","year":"2002","unstructured":"Viswanath P, Tse DNC, Laroia R: Opportunistic beamforming using dumb antennas. 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