Secure Degrees of Freedom of RIS-Assisted MIMO Broadcast Channel With Confidential Messages

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-08-07 DOI:10.1109/LCOMM.2024.3439769

Hongtao Luo;Qiang Wang;Jiaqi Che;Jingyi Chen

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Abstract

This letter investigates the secure degrees of freedom (SDoF) of reconfigurable intelligent surface (RIS) aided 2-user multiple-input multiple-output (MIMO) broadcast channel with confidential messages. In this model, transmitter sends corresponding secure messages to each receiver and ensure the other receiver cannot decode them. Compared to existing studies on broadcast channel with confidential messages, our model employs an active RIS that reduces the rank of channel matrices, enlarging the nullspace for secure transmission to increase the SDoF. In particular, our model can realize secure communication even when the SDoF of original model is zero. According to the different configurations of antennas, the problem is divided into several regimes. We present outer bound and corresponding proof for each regime by utilizing theoretical methods and RIS beamforming. Then we propose universal achievable schemes for different regimes by using zero-forcing decoding. Finally, we determine the exact SDoF of RIS-assisted MIMO broadcast channel with confidential messages and its SDoF gain compared to original model.

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具有机密信息的 RIS 辅助 MIMO 广播信道的安全自由度

本文研究了可重构智能表面（RIS）辅助双用户多输入多输出（MIMO）广播信道的安全自由度（SDoF）与保密信息。在该模型中，发送器向每个接收器发送相应的安全信息，并确保其他接收器无法解码。与现有的带机密信息的广播信道研究相比，我们的模型采用了主动 RIS，降低了信道矩阵的秩，扩大了安全传输的无效空间，从而提高了 SDoF。特别是，即使原模型的 SDoF 为零，我们的模型也能实现安全通信。根据天线配置的不同，问题可分为几种情况。我们利用理论方法和 RIS 波束成形，给出了每种状态的外界和相应证明。然后，我们利用零强迫解码提出了不同体制下的通用可实现方案。最后，我们确定了带有机密信息的 RIS 辅助 MIMO 广播信道的精确 SDoF 及其与原始模型相比的 SDoF 增益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.