Downlink OTFS-RSMA Cross-Domain Transmission Scheme and Sum-Rate Maximization

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-01-27 DOI:10.1109/LCOMM.2025.3534858

Qiwei Huai;Weina Yuan;Yue Wu;Pingzhi Fan

{"title":"Downlink OTFS-RSMA Cross-Domain Transmission Scheme and Sum-Rate Maximization","authors":"Qiwei Huai;Weina Yuan;Yue Wu;Pingzhi Fan","doi":"10.1109/LCOMM.2025.3534858","DOIUrl":null,"url":null,"abstract":"Rate splitting multiple access (RSMA) is an emerging multiple access scheme that plays a significant role in improving user sum-rate. This letter proposes a downlink orthogonal time frequency space-RSMA (OTFS-RSMA) cross-domain transmission scheme based on heterogeneous mobile user grouping and multicast technology, where high-speed users are served in the delay-Doppler (DD) domain and low-speed users are served in the time-frequency (TF) domain. Specifically, the OTFS-RSMA scheme categorizes users into high-speed users group and low-speed users group based on their mobility and then uses multicast to send cross-domain signals to the respective user groups, with RSMA used for transmission within the groups. By jointly optimizing the rate allocation and power control, this letter proposes a two-stage algorithm based on the coati optimization algorithm (COA) to maximize user sum-rate under the constraints of base station transmission power and QoS rate requirements. Our simulation results show that the proposed OTFS-RSMA scheme significantly outperforms the OTFS-NOMA scheme in terms of improving sum-rate.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 3","pages":"600-604"},"PeriodicalIF":3.7000,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10855588/","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"TELECOMMUNICATIONS","Score":null,"Total":0}

引用次数: 0

Abstract

Rate splitting multiple access (RSMA) is an emerging multiple access scheme that plays a significant role in improving user sum-rate. This letter proposes a downlink orthogonal time frequency space-RSMA (OTFS-RSMA) cross-domain transmission scheme based on heterogeneous mobile user grouping and multicast technology, where high-speed users are served in the delay-Doppler (DD) domain and low-speed users are served in the time-frequency (TF) domain. Specifically, the OTFS-RSMA scheme categorizes users into high-speed users group and low-speed users group based on their mobility and then uses multicast to send cross-domain signals to the respective user groups, with RSMA used for transmission within the groups. By jointly optimizing the rate allocation and power control, this letter proposes a two-stage algorithm based on the coati optimization algorithm (COA) to maximize user sum-rate under the constraints of base station transmission power and QoS rate requirements. Our simulation results show that the proposed OTFS-RSMA scheme significantly outperforms the OTFS-NOMA scheme in terms of improving sum-rate.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.