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arXiv 2104.06003eess.SPcs.ITmath.IT
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多用户系统下行链路与D2D协作策略的联合安全设计

Joint Secure Design of Downlink and D2D Cooperation Strategies for Multi-User Systems

Seok-Hwan Park, Xianglan Jin

摘要:

这项工作研究了用户间设备到设备(D2D)协作对于改善多用户下行链路系统中物理层秘密通信的作用。假设存在带外D2D信道,在每个带外D2D信道上,所选择的合法用户向其他合法用户发送所接收的下行链路信号的放大版本。设计这种系统的关键技术挑战是窃听者可以偷听下行链路以及D2D协作信号。我们解决的问题,联合优化的下行链路预编码,人工噪声协方差,放大系数,最大化的最小速率。提出了一种基于矩阵分式规划的迭代交替优化算法。数值结果证实了所提出的D2D合作计划相比,基准秘密通信方案的性能增益。

英文摘要:

This work studies the role of inter-user device-to-device (D2D) cooperation for improving physical-layer secret communication in multi-user downlink systems. It is assumed that there are out-of-band D2D channels, on each of which a selected legitimate user transmits an amplified version of the received downlink signal to other legitimate users. A key technical challenge for designing such systems is that eavesdroppers can overhear downlink as well as D2D cooperation signals. We tackle the problem of jointly optimizing the downlink precoding, artificial noise covariance, and amplification coefficients that maximize the minimum rate. An iterative alternating optimization algorithm is proposed based on the matrix fractional programming. Numerical results confirm the performance gains of the proposed D2D cooperation scheme compared to benchmark secret communication schemes.

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