文献类型：期刊文献

英文题名：Downlink OTFS-RSMA Cross-Domain Transmission Scheme and Sum-Rate Maximization

作者：Huai, Qiwei[1];Yuan, Weina[1];Wu, Yue[1];Fan, Pingzhi[2]

机构：[1]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China;[2]Southwest Jiaotong Univ, Key Lab Informat Coding & Transmiss, Chengdu 611756, Peoples R China

年份：2025

卷号：29

期号：3

起止页码：600

外文期刊名：IEEE COMMUNICATIONS LETTERS

收录：;EI(收录号：20250617808322);WOS:【SCI-EXPANDED(收录号:WOS:001443010300028)】；

基金：This work was supported by the NSFC Project (No.62020106001).

语种：英文

外文关键词：RSMA; OTFS; coati optimization algorithm; sum-rate maximization; RSMA; OTFS; coati optimization algorithm; sum-rate maximization

摘要：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.