标题： 具有超级公共消息的综合卫星地面网络的协调速率分裂多址技术 显示英文标题

标题： Coordinated Rate-Splitting Multiple Access for Integrated Satellite-Terrestrial Networks with Super-Common Message

摘要： 率分裂多址接入（RSMA）是一种新兴的多天线网络多址技术，它将消息分为公共部分和私有部分以灵活地减轻干扰。 受其鲁棒性和可扩展性的启发，在综合卫星 - 地面网络（ISTN）中采用RSMA是有前景的，其中卫星通过多波束组播传输广泛服务于卫星用户（SUs），而地面基站（BS）则通过单播传输服务于蜂窝用户（CUs），二者在同一频段内运行。 为了避免通过回程链路在卫星/蜂窝网络之间交换数据，我们假设了一个基于不完美信道状态信息的协调ISTN。 我们提出了一种针对协调ISTN定制的协调RSMA框架，通过在内部网络RS的公共/私有消息之上应用带有超公共消息的网络间RS来实现。 通过统一的网络间和网络内RS设计，我们联合优化私有/公共/超公共消息的预编码和功率分配，通过连续凸逼近实现所有SUs和CUs之间的最大最小公平性。 通过这种方式，可以根据卫星对CUs的干扰水平调整超公共消息的功率，从而潜在地减轻网络间的干扰。 仿真结果证明了我们的方法在应对各种干扰和传播条件下的优越性和鲁棒性。 显示英文摘要

摘要： Rate-splitting multiple access (RSMA) is an emerging multiple access technique for multi-antenna networks that splits messages into common and private parts for flexible interference mitigation. Motivated by its robustness and scalability, it is promising to employ RSMA in integrated satellite-terrestrial networks (ISTN), where a satellite serves satellite users (SUs) broadly with a multibeam multicast transmission while terrestrial base station (BS) serves cellular users (CUs) with a unicast transmission, operating in the same frequency band. To avoid the data exchange between satellite/cellular networks via backhaul, we assume a coordinated ISTN relying on imperfect channel state information. We put forth a coordinated RSMA framework tailored to the coordinated ISTN by applying inter-network rate-splitting (RS) with a super-common message on top of intra-network RS with common/private messages. With the unified RS design for inter- and intra-networks, we jointly optimize the precoding and power allocation of the private/common/super-common messages to achieve max-min fairness among all SUs and CUs through successive convex approximation. By doing so, the power of the super-common message can be adjusted according to interference levels of the satellite towards CUs, thereby potentially mitigating inter-network interference. Simulation results demonstrate the superiority and robustness of our approach to cope with various interference and propagation conditions.