Reconfigurable Intelligent Surface aided Massive MIMO Systems with Low-Resolution DACs

Jianxin Dai, Yuanyuan Wang, Cunhua Pan*, Kangda Zhi, Hong Ren, Kezhi Wang

*Corresponding author for this work

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Abstract

We investigate a reconfigurable intelligent surface (RIS)-aided multi-user massive multiple-input multi-output (MIMO) system where low-resolution digital-analog converters (DACs) are configured at the base station (BS) in order to reduce the cost and power consumption. An approximate analytical expression for the downlink achievable rate is derived based on maximum ratio transmission (MRT) and additive quantization noise model (AQNM), and the rate maximization problem is solved by particle swarm optimization (PSO) method under both continuous phase shifts (CPSs) and discrete phase shifts (DPSs) at the RIS. Simulation results show that the downlink sum achievable rate tends to a constant with the increase of the number of quantization bits of DACs, and four quantization bits are enough to capture a large portion of the performance of the ideal perfect DACs case.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalIEEE Communications Letters
Early online date14 Jul 2021
DOIs
Publication statusE-pub ahead of print - 14 Jul 2021

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