Joint Active and Passive Beamforming for IRS-Aided Multiuser Systems with Low-Resolution DACs
2023 IEEE 24th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)(2023)
摘要
We investigate the problem of joint active and passive beamforming for intelligent reflecting surface (IRS)-aided multi-user multiple-input multiple-output (MIMO) communication systems where the base station (BS) adopts low-resolution DACs to reduce the power consumption and hardware complexity. The additive quantization noise model (AQNM) is employed to model the nonlinear quantization operation. Given a pre-specified minimum achievable rate for each user, an optimization which aims to minimize the transmit power is formulated. We devise an iterative algorithm based on alternating optimization and semi-definite relaxation (SDR) techniques. Numerical results verify the effectiveness of the proposed method.
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关键词
Intelligent reflecting surface,low-resolution DAC,additive quantization noise model,active and passive beamforming
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