论文标题

速率分拆多重访问多端纳特纳关节雷达和与部分CSIT的通信:预编码器优化和链接级仿真

Rate-Splitting Multiple Access for Multi-Antenna Joint Radar and Communications with Partial CSIT: Precoder Optimization and Link-Level Simulations

论文作者

Loli, Rafael Cerna, Dizdar, Onur, Clerckx, Bruno

论文摘要

已经研究了双功能雷达通信(DFRC)系统,以管理雷达和通信系统之间的系统间干扰。但是,文献研究通常认为DFRC在发射器(CSIT)上具有完美的渠道状态信息,这是由于实际部署中不可避免的CSIT错误而导致的一个不切实际的假设。在这项工作中,我们旨在在部分CSIT的实际假设下设计DFRC系统。为了实现这一目标,提出的DFRC将多输入多输出(MIMO)雷达的功能与速率降低的多个访问(RSMA)结合。 RSMA是一种基于线性预编码的速率分解(RS)的功能强大的下行链路通信方案,该方案部分解码了多用户干扰(MUI),并部分将其视为噪声,并且对部分CSIT具有固有的稳健性。使用RSMA,在存在部分CSIT的情况下优化了DFRC预编码器,以同时在服务质量(QOS)约束下同时最大化平均加权总和(AWSR),并最大程度地减少DFRC BeamPattern均值误差(MSE)与理想的Mimo Radar Beampattern。仿真结果表明,基于RSMA的DFRC在很大程度上胜过基于其他常用策略(例如空间分区多访问(SDMA)和非正交多重访问(NOMA))的DFRC。具体而言,基于RSMA的DFRC中独特的公共流可以进行灵活的速率分配,以确保用户速率公平性使用部分CSIT,同时也是生成有效雷达传感的定向beampattern的主要贡献者。然后,通过链接级仿真(LLS)进一步评估DFRC的实际性能,以考虑有限长度制度中编码和调制的影响以及由于行动率和延迟而导致的通道老化,其中RSMA的优势再次得到了证实。

Dual-Functional Radar-Communication (DFRC) systems have been investigated to manage the inter-system interference between radar and communication systems. However, the studies in literature often assume that the DFRC possesses perfect Channel State Information at the Transmitter (CSIT), which is an unrealistic assumption due to the inevitable CSIT errors in practical deployments. In this work, we aim to design a DFRC system under the practical assumption of partial CSIT. To achieve this, the proposed DFRC marries the capabilities of a Multiple-Input Multiple-Output (MIMO) radar with Rate-Splitting Multiple Access (RSMA). RSMA is a powerful downlink communication scheme based on linearly precoded Rate-Splitting (RS) that partially decodes multi-user interference (MUI) and partially treats it as noise and is inherently robust to partial CSIT. Using RSMA, the DFRC precoders are optimized in the presence of partial CSIT to simultaneously maximize the Average Weighted Sum-Rate (AWSR) under Quality-of-Service (QoS) constraints and minimize the DFRC beampattern Mean Squared Error (MSE) against an ideal MIMO radar beampattern. Simulation results demonstrate that the RSMA-based DFRC largely outperforms DFRCs based on other commonly used strategies such as Space Division Multiple Access (SDMA) and Non-Orthogonal Multiple Access (NOMA). Specifically, the common stream unique in the RSMA-based DFRC allows for flexible rate partitioning to guarantee user rate fairness with partial CSIT while also being the main contributor to generating a directional beampattern for effective radar sensing. The practical performance of the DFRC is then further assessed through Link-Level simulations (LLS) to take into account the effects of coding and modulation in the finite length regime as well as the channel aging due to mobility and latency, where the superiority of RSMA is again corroborated.

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