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| A Novel Channel Quantization and Feedback Algorithm in Multiuser Diversity Systems |
| Liang Xue-jun; Zhu Guang-xi;Cao Xi; Wang De-sheng |
| Department of Electronics & Information Engineering, Huazhong Univ.of Sci. & Tech., Wuhan 430074, China |
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Abstract In this paper, the relative content is researched for resolving the problem that a lot of wireless resource is expended by feedback information in MIMO-OFDM system. A novel algorithm including cluster, quantization and feedback is proposed. By utilizing the frequency correlation of the wireless channel, adjacent subcarriers are divided into several cluster and a cluster is seen as a feedback cell. Quantization is proposed by quantized values indicating the modulation level, because a discrete finite set of candidate constellation sizes is applied to practical systems. Finally, partial cluster quality information is transmitted to basestation through ordering and setting threshold. Theory deduction and simulation result show that the proposed algorithm needs only a little feedback information and has a trivial loss in terms of spectrum efficiency.
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Received: 05 November 2007
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2009, Vol. 31 
