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

DC Field Value Language Park, Jeonghun ko Choi, Jinseok ko Lee, Namyoon ko Shin, Wonjae ko Poor, H. Vincent ko 2023-09-15T04:26:14Z - 2023-09-14 ko 2023-03 ko
dc.identifier.citation IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.22, no.3, pp.1588 - 1603 ko
dc.identifier.issn 1536-1276 ko
dc.identifier.uri -
dc.description.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. ko
dc.language 영어 ko
dc.title Rate-Splitting Multiple Access for Downlink MIMO: A Generalized Power Iteration Approach ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85139430479 ko
dc.identifier.wosid 001049998100009 ko
dc.type.rims ART ko
dc.identifier.doi 10.1109/TWC.2022.3205480 ko
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