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최진석

Choi, Jinseok
Intelligent Wireless Communications Lab.
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Rate-Splitting Multiple Access for Downlink MIMO: A Generalized Power Iteration Approach

Author(s)
Park, JeonghunChoi, JinseokLee, NamyoonShin, WonjaePoor, H. Vincent
Issued Date
2023-03
DOI
10.1109/TWC.2022.3205480
URI
https://scholarworks.unist.ac.kr/handle/201301/65535
Citation
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.22, no.3, pp.1588 - 1603
Abstract
Rate-splitting multiple access (RSMA) is a general multiple access scheme for downlink multi-antenna systems embracing both classical spatial division multiple access and more recent non-orthogonal multiple access. Finding a linear precoding strategy that maximizes the sum spectral efficiency of RSMA is a challenging yet significant problem. In this paper, we put forth a novel precoder design framework that jointly finds the linear precoders for the common and private messages for RSMA. Our approach is first to approximate the non-smooth minimum function part in the sum spectral efficiency of RSMA using a LogSumExp technique. Then, we reformulate the sum spectral efficiency maximization problem as a form of the log-sum of Rayleigh quotients to convert it into a tractable form. By interpreting the first-order optimality condition of the reformulated problem as an eigenvector-dependent nonlinear eigenvalue problem, we reveal that the leading eigenvector of the derived optimality condition is a local optimal solution. To find the leading eigenvector, we propose an algorithm inspired by a power iteration. Simulation results show that the proposed RSMA transmission strategy provides significant improvement in the sum spectral efficiency compared to the state-of-the-art RSMA transmission methods.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
ISSN
1536-1276
Keyword (Author)
DownlinkPrecodingTransmittersMIMO communicationOptimizationMultiaccess communicationChannel estimationRate-splitting multiple access (RSMA)multi-user MIMOimperfect channel state information (CSI)sum spectral efficiency maximizationgeneralized power iteration
Keyword
MULTIUSER MISO SYSTEMSSUM-RATE MAXIMIZATIONBROADCAST CHANNELSPECTRAL EFFICIENCYIMPERFECT CSITDESIGNTRANSMISSIONNETWORKSSTRATEGY

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