首页|Twin-timescale design for IRS-assisted MIMO system with outdated CSI
Twin-timescale design for IRS-assisted MIMO system with outdated CSI
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This paper considers an intelligent reflecting surface(IRS)-assisted multiple-input multiple-output(MIMO)system.To maximize the average achievable rate(AAR)under outdated channel state information(CSI),we propose a twin-timescale passive beamforming(PBF)and power allocation protocol which can reduce the IRS configuration and training overhead.Specifi-cally,the short-timescale power allocation is designed with the outdated precoder and fixed PBF.A new particle swarm opti-mization(PSO)-based long-timescale PBF optimization is pro-posed,where mini-batch channel samples are utilized to update the fitness function.Finally,simulation results demonstrate the effectiveness of the proposed method.
intelligent reflecting surface(IRS)twin-timescale beamformingoutdated channel state information(CSI)
CAO Yashuai、LYU Tiejun、NI Wei
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School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China
Data61,Commonwealth Scientific and Industrial Research Organisation,Sydney 2122,Australia
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