A Novel Low Complexity Scheme for Multiuser Massive MIMO Systems

Aye Mon HTUN

IEICE TRANSACTIONS on Communications   Vol.E105-B    No.1    pp.85-96
Publication Date: 2022/01/01
Publicized: 2021/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2021EBP3039
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
MU-massive MIMO,  user selection,  transmit antenna selection,  computation complexity,  SINR,  SVD,  block diagonalization,  

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In this paper, we propose a novel user selection scheme based on jointly combining channel gain (CG) and signal to interference plus noise ratio (SINR) to improve the sum-rate as well as to reduce the computation complexity of multi-user massive multi-input multi-output (MU-massive MIMO) downlink transmission through a block diagonalization (BD) precoding technique. By jointly considering CG and SINR based user sets, sum-rate performance improvement can be achieved by selecting higher gain users with better SINR conditions as well as by eliminating the users who cause low sum-rate in the system. Through this approach, the number of possible outcomes for the user selection scheme can be reduced by counting the common users for every pair of user combinations in the selection process since the common users of CG-based and SINR-based sets possess both higher channel gains and better SINR conditions. The common users set offers not only sum-rate performance improvements but also computation complexity reduction in the proposed scheme. It is shown by means of computer simulation experiments that the proposed scheme can increase the sum-rate with lower computation complexity for various numbers of users as compared to conventional schemes requiring the same or less computational complexity.