Rate-Splitting Multiple Access for Communications and Jamming in Multi-Antenna Multi-Carrier Cognitive Radio Systems
Rate-Splitting Multiple Access for Communications and Jamming in Multi-Antenna Multi-Carrier Cognitive Radio Systems
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DOI：
10.1109/tifs.2022.3149145
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发表时间：
2021-07
影响因子：
6.8
通讯作者：
Onur Dizdar;B. Clerckx
中科院分区：
文献类型：
--
作者：
Onur Dizdar;B. Clerckx
随着无线通信系统数量的增加和对带宽的需求，无线介质已经变成拥塞和竞争的环境。在这样的环境下运行带来了一些挑战，特别是对于军事通信系统，它需要保证可靠的通信，同时避免干扰其他友好或中立系统，并拒绝敌方系统的服务。在这项工作中，我们研究了一种新的应用率分离多址（RSMA）的联合通信和干扰与多载波（MC）波形在多天线认知无线电（CR）系统。RSMA是用于下行链路多天线无线网络的鲁棒多址方案。RSMA依赖于发射机处的多天线速率分离（RS）策略和接收机处的连续干扰消除（SIC）。通过在次级发射机处采用RSMA，我们的目标是同时与次级用户（SU）通信并干扰敌对用户（AU）以中断其通信，同时限制对主要用户（PU）的干扰，其中所有用户在其各自的网络中通过MC波形执行宽带通信。我们考虑了SU和PU的发射机处的不完美CSI（CSIT）的实际设置，以及AU的统计CSIT。我们制定了一个问题，以获得最佳的预编码器，最大限度地提高干扰和干扰功率约束下的互信息。我们提出了一个交替优化-交替方向乘法（AO-ADMM）为基础的算法来解决由此产生的非凸问题。基于Karush-Kuhn-Tucker（KKT）条件进行分析，确定了保证问题可行性的最优干扰和干扰功率阈值，并提出了一种实用的干扰功率阈值计算算法。仿真结果表明，RSMA比空分多址（SDMA）和非正交多址（NOMA）具有更高的和速率性能。
With the increasing number of wireless communication systems and the demand for bandwidth, the wireless medium has become a congested and contested environment. Operating under such an environment brings several challenges, especially for military communication systems, which need to guarantee reliable communication while avoiding interfering with other friendly or neutral systems and denying the enemy systems of service. In this work, we investigate a novel application of Rate-Splitting Multiple Access (RSMA) for joint communications and jamming with a Multi-Carrier (MC) waveform in a multi-antenna Cognitive Radio (CR) system. RSMA is a robust multiple access scheme for downlink multi-antenna wireless networks. RSMA relies on multi-antenna Rate-Splitting (RS) strategy at the transmitter and Successive Interference Cancellation (SIC) at the receivers. By employing RSMA at the secondary transmitter, our aim is to simultaneously communicate with Secondary Users (SUs) and jam Adversarial Users (AUs) to disrupt their communications while limiting the interference to Primary Users (PUs) in a setting where all users perform broadband communications by MC waveforms in their respective networks. We consider the practical setting of imperfect CSI at Transmitter (CSIT) for the SUs and PUs, and statistical CSIT for AUs. We formulate a problem to obtain optimal precoders which maximize the mutual information under interference and jamming power constraints. We propose an Alternating Optimization-Alternating Direction Method of Multipliers (AO-ADMM) based algorithm for solving the resulting non-convex problem. We perform an analysis based on Karush-Kuhn-Tucker (KKT) conditions to determine the optimal jamming and interference power thresholds that guarantee the feasibility of problem and propose a practical algorithm to calculate the interference power threshold. By simulation results, we demonstrate that RSMA achieves a higher sum-rate performance than Space Division Multiple Access (SDMA) and Non-Orthogonal Multiple Access (NOMA).