arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.07914eess.SPcs.ITmath.IT
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多天线雷达与通信联合的速率分离多址接入

Rate-Splitting Multiple Access for Multi-Antenna Joint Radar and Communications

Chengcheng Xu, Bruno Clerckx, Shiwa Chen, Yijie Mao, Jianyun Zhang

摘要:

双功能雷达通信(DFRC)系统是5G后必不可少的和有前途的技术。在这项工作中,我们提出了一个强大的和统一的多天线DFRC传输框架,其中一个额外的雷达序列发送除了通信流,以提高雷达波束匹配能力,和速率分裂多址接入(RSMA),以更好地管理干扰。RSMA依赖于具有连续干扰消除(SIC)接收器的多天线速率分割(RS),以及将消息分割和编码为公共和专用流。我们设计的消息分裂和预编码器的雷达序列和通信流,以联合最大化加权和速率(WSR)和最小化雷达波束方向图近似均方误差(MSE)的每天线功率约束。提出了一种基于乘子交替方向法(ADMM)的迭代算法。数值结果首先表明,RSMA辅助DFRC实现WSR和波束图近似之间的更好的折衷比空分多址(SDMA)辅助DFRC有或没有雷达序列,和其他更简单的雷达通信策略,使用正交资源。我们还表明,RSMA辅助DFRC框架与雷达序列和不实现相同的权衡性能。这是因为在所提出的框架中更好地利用了公共流。RSMA的公共流实现了管理通信用户之间的干扰、管理通信与雷达之间的干扰以及波束图近似的三重功能。因此,通过在DFRC中启用RSMA,系统性能得到增强,同时系统架构得到简化,因为不需要使用额外的雷达序列和SIC。我们的结论是,RSMA是一个更强大的多址接入DFRC。

英文摘要:

Dual-Functional Radar-Communication (DFRC) system is an essential and promising technique for beyond 5G. In this work, we propose a powerful and unified multi-antenna DFRC transmission framework, where an additional radar sequence is transmitted apart from communication streams to enhance radar beampattern matching capability, and Rate-Splitting Multiple Access (RSMA) is adopted to better manage the interference. RSMA relies on multi-antenna Rate-Splitting (RS) with Successive Interference Cancellation (SIC) receivers, and the split and encoding of messages into common and private streams. We design the message split and the precoders of the radar sequence and communication streams to jointly maximize the Weighted Sum Rate (WSR) and minimize the radar beampattern approximation Mean Square Error (MSE) subject to the per antenna power constraint. An iterative algorithm based on Alternating Direction Method of Multipliers (ADMM) is developed to solve the problem. Numerical results first show that RSMA-assisted DFRC achieves a better tradeoff between WSR and beampattern approximation than Space-Division Multiple Access (SDMA)-assisted DFRC with or without radar sequence, and other simpler radar-communication strategies using orthogonal resources. We also show that the RSMA-assisted DFRC frameworks with and without radar sequence achieve the same tradeoff performance. This is because that the common stream is better exploited in the proposed framework. The common stream of RSMA fulfils the triple function of managing interference among communication users, managing interference between communication and radar, and beampattern approximation. Therefore, by enabling RSMA in DFRC, the system performance is enhanced while the system architecture is simplified since there is no need to use additional radar sequence and SIC. We conclude that RSMA is a more powerful multiple access for DFRC.

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