Decentralized Beamforming Design for Intelligent Reflecting Surface-Enhanced Cell-Free Networks

QC 20210412
Cell-free networks are considered to be a promising distributed network architecture to satisfy the increasing number of users and high rate expectations in beyond-5G systems. However, to further enhance network capacity, an increasing number of high-cost base stations (BSs) is required. To address this problem and inspired by the cost-effective intelligent reflecting surface (IRS) technique, we propose a fully decentralized design framework for cooperative beamforming in IRS-aided cell-free networks. We first transform the centralized weighted sum-rate maximization problem into a tractable consensus optimization problem, and then an incremental alternating direction method of multipliers (ADMM) algorithm is proposed to locally update the beamformer. The complexity and convergence of the proposed method are analyzed, and these results show that the performance of the new scheme can asymptotically approach that of the centralized one as the number of iterations increases. Results also show that IRSs can significantly increase the system sum-rate of cell-free networks and the proposed method outperforms existing decentralized methods.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
Array signal processing
Optimization
Transforms
Channel estimation
Wireless communication
Power demand
Interference
Beamforming
cell-free networks
intelligent reflecting surface
decentralized optimization

Ye, YuKTH,Teknisk informationsvetenskap(Swepub:kth)u1y1pv31 (author)
Xiao, Ming,1975-KTH,Teknisk informationsvetenskap(Swepub:kth)u1iq6n9a (author)
Poor, H. VincentPrinceton Univ, Dept Elect Engn, Princeton, NJ 08544 USA. (author)
Skoglund, Mikael,1969-KTH,Teknisk informationsvetenskap(Swepub:kth)u1dbnyps (author)
KTHTeknisk informationsvetenskap (creator_code:org_t)

In:IEEE Wireless Communications Letters: Institute of Electrical and Electronics Engineers (IEEE)10:3, s. 673-6772162-23372162-2345

By the author/editor: Huang, Shaocheng; Ye, Yu; Xiao, Ming, 1975 ...; Poor, H. Vincent; Skoglund, Mikael ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Telecommunicatio ...

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