TY - JOUR
T1 - Reconfigurable Intelligent Surface aided Massive MIMO Systems with Low-Resolution DACs
AU - Dai, Jianxin
AU - Wang, Yuanyuan
AU - Pan, Cunhua
AU - Zhi, Kangda
AU - Ren, Hong
AU - Wang, Kezhi
PY - 2021/9
Y1 - 2021/9
N2 - 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.
AB - 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.
KW - Downlink
KW - Intelligent Reflecting Surface
KW - low-resolution DACs
KW - massive MIMO
KW - Massive MIMO
KW - Particle swarm optimization
KW - Quantization (signal)
KW - Reconfigurable intelligent surface (RIS)
KW - Rician channels
KW - Telecommunications
KW - Wireless communication
KW - Intelligent reflecting surface
KW - Low-resolution DACs
KW - intelligent reflecting surface
UR - http://www.scopus.com/inward/record.url?scp=85110898071&partnerID=8YFLogxK
U2 - 10.1109/LCOMM.2021.3097208
DO - 10.1109/LCOMM.2021.3097208
M3 - Article
AN - SCOPUS:85110898071
VL - 25
SP - 3124
EP - 3128
JO - IEEE Communications Letters
JF - IEEE Communications Letters
SN - 1089-7798
IS - 9
M1 - 9483943
ER -