Energy Efficiency Maximization in RIS-Aided Cell-Free Network With Limited Backhaul

Integrating the reconfigurable intelligent surface in a cell-free (RIS-CF) network is an effective solution to improve the capacity and coverage of future wireless systems with low cost and power consumption. The reflecting coefficients of RISs can be programmed to enhance signals received at users....

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Bibliographic Details
Published in:IEEE communications letters 2021-06, Vol.25 (6), p.1974-1978
Main Authors: Le, Quang Nhat, Nguyen, Van-Dinh, Dobre, Octavia A., Zhao, Ruiqin
Format: Article
Language:English
Subjects:
Algorithms
Approximation algorithms
Array signal processing
Beamforming
Cell-free network
Central Processing Unit
Energy efficiency
Intercell interference
limited backhaul
Optimization
Power consumption
Power demand
reconfigurable intelligent surface
System effectiveness
Wireless communication
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Summary:Integrating the reconfigurable intelligent surface in a cell-free (RIS-CF) network is an effective solution to improve the capacity and coverage of future wireless systems with low cost and power consumption. The reflecting coefficients of RISs can be programmed to enhance signals received at users. This letter addresses a joint design of transmit beamformers at access points and reflecting coefficients at RISs to maximize the energy efficiency (EE) of RIS-CF networks, taking into account the limited backhaul capacity constraints. Due to a very computationally challenging nonconvex problem, we develop a simple yet efficient alternating algorithm for its solution. Numerical results verify that the EE of RIS-CF networks is greatly improved, showing the benefit of using RISs.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2021.3062275