Low Complexity Scheduling Algorithms for Downlink Multiuser MIMO System

Jinfan ZHANG
Yunzhou LI
Shidong ZHOU

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.2    pp.358-363
Publication Date: 2007/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.2.358
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
downlink,  multiuser MIMO,  TDMA,  user scheduling,  

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Downlink multiuser MIMO system has attracted considerable attention recently for its potential to increase the system capacity. However, due to the limitation on the number of transmit antennas, when there are more users than can be supported simultaneously in a cell, other multiple access schemes, such as TDMA, must be applied in combination with multiuser MIMO. In this paper, we aim to design practical user scheduling algorithms to maximize the system capacity. Because the brute-force search for optimal user allocation is computationally prohibitive, we propose three low complexity suboptimal scheduling algorithms that offer both low complexity and high performance.