Resource Allocation for RSMA-Based Coordinated Direct and Relay Transmission

Resource Allocation for RSMA-Based Coordinated Direct and Relay Transmission
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基于RSMA的协调直接和中继传输的资源分配

DOI:
10.1109/lwc.2022.3232782
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发表时间:
2023-03
影响因子:
6.3
通讯作者:
Miaowen Wen
Miaowen Wen
中科院分区:
计算机科学2区
文献类型:
--
作者:
Haorao Pang;Fei Ji;Lexi Xu;Yuan Liu;Miaowen Wen

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在这封信中,我们研究了一种基于速率分裂多址(RSMA)的协调直接和中继传输(CDRT)系统,其中基站(BS)使用速率分裂策略为两个用户服务,而解码转发(DF)中继帮助BS建立与远端用户的通信链路。我们主要研究以最大化两个用户的最小可达速率为目标的最大-最小公平性问题。在有限的系统资源约束下,联合优化BS和中继站的预编码向量、每个用户的公共速率和时间分配系数。不幸的是,由于优化变量的耦合和目标的非凸性,优化问题是非凸的。为此,我们将原问题转化为凸差分(DC)规划,并采用基于迭代约束凹凸过程(CCCP)的算法来获得次优解。仿真结果表明,与传统的CDRT策略相比,我们提出的RSMA-CDRT策略具有显著的性能优势,并且能够灵活地适应不同的信道环境。
In this letter, we investigate a rate splitting multiple access (RSMA) based coordinated direct and relay transmission (CDRT) system, where a base station (BS) serves two users using the rate splitting strategy, and a decode-and-forward (DF) relay aids the BS in establishing a communication link with a far user. We focus on a max-min fairness problem aiming at maximizing the minimum achievable rate of two users. The precoding vectors of the BS and the relay, the common rate of each user and the time allocation coefficients are jointly optimized under the constraint of limited system resources. Unfortunately, the optimization problem is non-convex due to the coupled optimization variables and the non-convex objective. Therefore, we transform the original problem into a difference of convex (DC) program and obtain a sub-optimal solution by adopting an iterative constrained concave convex procedure (CCCP) based algorithm. Simulation results demonstrate substantial performance gains of our proposed RSMA-CDRT over the conventional CDRT strategies and the flexibility in adapting to various channel environments.
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