TY - JOUR
T1 - On Superimposed Pilots Transmission for RIS-Assisted Cell-Free Massive MIMO
AU - Huang, Jian
AU - Jin, Xiaoping
AU - Xia, Qian
AU - Huang, Chongwen
AU - Yao, Yudong
N1 - Publisher Copyright:
© 2001-2012 IEEE.
PY - 2024
Y1 - 2024
N2 - This article studies the reconfigurable intelligent surface (RIS)-assisted cell-free massive multiple-input-multiple-output (MIMO) systems under superimposed pilots (SPs) transmission. We derive a closed-form expression for the linear minimum mean square error channel estimation and the spectral efficiency (SE) under a maximally-ratio-combined receiver filter. Vital factors including the number of reflecting elements and the channel coherence time are investigated. Improved particle swarm optimization (IPSO) algorithm is utilized to optimize the power scaling factor for maximizing the sum-SE. Results show that the sum-SE grows with more RIS units, and SP performs better than regular pilot (RP) transmission. Moreover, optimizing the power scaling factor by IPSO achieves around 17% improvement in sum-SE.
AB - This article studies the reconfigurable intelligent surface (RIS)-assisted cell-free massive multiple-input-multiple-output (MIMO) systems under superimposed pilots (SPs) transmission. We derive a closed-form expression for the linear minimum mean square error channel estimation and the spectral efficiency (SE) under a maximally-ratio-combined receiver filter. Vital factors including the number of reflecting elements and the channel coherence time are investigated. Improved particle swarm optimization (IPSO) algorithm is utilized to optimize the power scaling factor for maximizing the sum-SE. Results show that the sum-SE grows with more RIS units, and SP performs better than regular pilot (RP) transmission. Moreover, optimizing the power scaling factor by IPSO achieves around 17% improvement in sum-SE.
KW - Cell-free massive multiple-input multiple-output (CF-mMIMO)
KW - particle swarm optimization (PSO)
KW - reconfigurable intelligent surface (RIS)
KW - superimposed pilots (SPs)
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U2 - 10.1109/JSEN.2024.3427108
DO - 10.1109/JSEN.2024.3427108
M3 - Article
AN - SCOPUS:85199038867
SN - 1530-437X
VL - 24
SP - 28178
EP - 28182
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
IS - 17
ER -