论文标题
双功能雷达通信卫星系统的速率分拆多重访问
Rate-Splitting Multiple Access for Dual-Functional Radar-Communication Satellite Systems
论文作者
论文摘要
在本文中，我们考虑了多功能双功能雷达通信（DFRC）卫星系统，该卫星具有双重能力，可以与下行链路卫星用户（SUS）同时通信，并向移动的目标进行探针检测信号。为了设计合适的DFRC波形，我们研究了速率降低的多个访问（RSMA）辅助的DFRC BeamFoming，并使用CRAMER-RAO结合（CRB）作为雷达性能度量指标，该指标代表了无偏置估计器的方差的下限。优化波束形成以最大程度地减少CRB的服务质量（QoS）的限制，并每次发射功率预算。使用我们设计的DFRC波形同时完成卫星通信和检测到双基因模式的地面/海对象。仿真结果表明，在多片卫星系统中，提出的RSMA辅助DFRC波束成绩优于传统空间分割多访问（SDMA）策略。
In this paper, we consider a multi-antenna dual-functional radar-communication (DFRC) satellite system, where the satellite has a dual capability to simultaneously communicate with downlink satellite users (SUs) and probe detection signals to a moving target. To design an appropriate DFRC waveform, we investigate the rate-splitting multiple access (RSMA)-assisted DFRC beamfoming, and employ the Cramer-Rao bound (CRB) as a radar performance metric, which represents a lower bound on the variance of unbiased estimators. The beamforming is optimized to minimize the CRB subject to quality of service (QoS) constraints of SUs and a per-feed transmit power budget. Satellite communication and detecting ground/ sea objects in a bistatic mode are accomplished simultaneously using the DFRC waveform we designed. Simulation results demonstrate that the proposed RSMA-assisted DFRC beamforming outperforms the conventional space-division multiple access (SDMA) strategy in terms of the communication-sensing trade-off and target estimation performance in a multibeam satellite system.
