Resource Allocation for RSMA-Aided Multibeam Satellite Communications  

作　　者：Cui Huanxi Xiao Zhenyu Zhu Lipeng 

机构地区：[1]School of Electronic and Information Engineering,Beihang University,Beijing 100091,China [2]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore

出　　处：《China Communications》2025年第2期241-255,共15页中国通信(英文版)

摘　　要：This paper investigates the resource allocation for rate-splitting multiple access(RSMA)enabled multibeam satellite communication systems.Specifically,we minimize the total unmet user rate,which denotes the difference between the users’rate requirement and the practical achievable rate,as well as the total transmit power of the satellite by optimizing the precoding,power allocation,and rate allocation,under the per-feed power and rate constraints.To solve the non-convex optimization problem,a twostage scheme is proposed.In particular,in the first stage,we present a precoding scheme by maximizing the signal-to-leakage-plus-noise ratio of each beam to eliminate the inter-beam interference.In the second stage,we introduce auxiliary variables to obtain an upper bound on the objective function under the given precoding matrix and transform the rate constraints of the original problem into second-order cones(SOC)and linear matrix inequations(LMI).Then,the successive convex approximation(SCA)technique is used to obtain suboptimal power and rate allocation solutions.Moreover,the initial feasible solution for power allocation is provided by using the standard interior point method.Finally,numerical results verify the superiority of our proposed solution compared to the benchmark methods in terms of objective function values.

关 键 词：multibeam satellite power allocation PRECODING rate allocation rate-splitting multiple access(RSMA) 

分 类 号：TN927.2[电子电信—通信与信息系统]