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User and Antenna Joint Selection in Multi-User Large-Scale MIMO Downlink Networks
Moo-Woong JEONG Tae-Won BAN Bang Chul JUNG
IEICE TRANSACTIONS on Communications
Publication Date: 2017/04/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
large-scale MIMO, massive MIMO, MU-MIMO, user and antenna joint selection, complexity,
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In this paper, we investigate a user and antenna joint selection problem in multi-user large-scale MIMO downlink networks, where a BS with N transmit antennas serves K users, and N is much larger than K. The BS activates only S(S≤N) antennas for data transmission to reduce hardware cost and computation complexity, and selects the set of users to which data is to be transmitted by maximizing the sum-rate. The optimal user and antenna joint selection scheme based on exhaustive search causes considerable computation complexity. Thus, we propose a new joint selection algorithm with low complexity and analyze the performance of the proposed scheme in terms of sum-rate and complexity. When S=7, N=10, K=5, and SNR=10dB, the sum-rate of the proposed scheme is 5.1% lower than that of the optimal scheme, while the computation complexity of the proposed scheme is reduced by 99.0% compared to that of the optimal scheme.