Performance Analysis of Block MSN Algorithm with Pseudo-Noise Control in Multi-User MIMO System

Nobuyoshi KIKUMA
Kousuke YONEZU

IEICE TRANSACTIONS on Communications   Vol.E102-B    No.2    pp.224-232
Publication Date: 2019/02/01
Publicized: 2018/08/21
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018ISP0004
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2017)
Category: MIMO
Multi-User MIMO,  block beamforming,  BD algorithm,  BMSN algorithm,  pseudo-noise control,  

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MU-MIMO (Multi-User Multiple Input and Multiple Output) has been considered as a fundamental technology for simultaneous communications between a base station and multiple users. This is because it can generate a large virtual MIMO channel between a base station and multiple user terminals with effective utilization of wireless resources. As a method of implementing MU-MIMO downlink, Block Diagonalization (BD) was proposed in which the transmission weights are determined to cancel interference between multiple user terminals. On the other hand, Block Maximum Signal-to-Noise ratio (BMSN) was proposed which determines the transmission weights to enhance the gain for each user terminal in addition to the interference cancellation. As a feature, BMSN has a pseudo-noise for controlling the null depth to the interference. In this paper, to enhance further the BMSN performance, we propose the BMSN algorithm that has the pseudo-noise determined according to receiver SNR. As a result of computer simulation, it is confirmed that the proposed BMSN algorithm shows the significantly improved performance in evaluation of bit error rate (BER) and achievable bit rate (ABR).