Blind Adaptive Array by Constant Modulus with Variable Step Size for Multi-beam Massive MIMO

Conference: WSA 2019 - 23rd International ITG Workshop on Smart Antennas
04/24/2019 - 04/26/2019 at Vienna, Austria

Proceedings: ITG-Fb. 286: WSA 2019

Pages: 6Language: englishTyp: PDF

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Nishimori, Kentaro (Faculty of Engineering, Niigata University, Niigata, Japan)
Maruta, Kazuki (Graduate School of Engineering, Chiba University, Chiba, Japan)
Hiraguri, Takefumi (Department of Electrical and Electronics Engineering, Nippon Institute of Technology, Saitama, Japan)

A multibeam massive multiple-input multiple-output (MIMO) configuration has previously been proposed that utilizes beam selection to select high-power beams in an analog part and a blind algorithm such as the constant-modulus algorithm (CMA), which does not need channel state information (CSI), in a digital part. However, when least-squares CMA (LS-CMA) is applied to a quadrature amplitude modulation (QAM) signal whose amplitude changes, the interference cancellation effect decreases as the modulation order number increases. In this paper, variable-step-size-based CMA (VS-CMA), which modifies the step size of steepest-descent CMA (SD-CMA) as the blind adaptive algorithm instead of LS-CMA, is proposed. The basic performance of VS-CMA, its success in accomplishing interference cancellation, and its effectiveness with multibeam massive MIMO transmission are verified via computer simulation.