Secrecy rate optimization for dual-functional radar-communication system with energy receiver,Transactions on Emerging Telecommunications Technologies

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Secrecy rate optimization for dual-functional radar-communication system with energy receiver
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2022-08-14 , DOI: 10.1002/ett.4617
Xiao Tong ₁ , Xin Li ₂ , Fuwang Dong ₁ , Wei Wang ₁ , Ang Li ₃

Affiliation

This article studies the secrecy rate optimization in the downlink transmission of a dual-functional radar-communication system, under the simultaneous wireless information and power transfer (SWIPT) setting. Specifically, the base station (BS) simultaneously transmits information and energy signals while detecting the target, where the energy receiver (ER) also behaves as a potential eavesdropper. In order to ensure secure information transmission, we design the beamformer to avoid information leakage by maximizing the secrecy rate under the total transmit power budget, the received signal-to-noise ratio (SNR) target at the BS, and the received energy requirement of the ER. To deal with the non-convexity of the cost function and constraints in the original problem, we first transform the problem into an equivalent semidefinite relaxation (SDR) version by linearizing the cost function with the introduced auxiliary variables. Thus, the off-the-shelf semidefinite programming (SDP) solver can be leveraged to obtain desired beamforming matrices, which is guaranteed to be rank-1. To alleviate the computational costs of SDP, we further propose a sub-optimal solution via the block coordinate descent method and the Taylor series expansion. Numerical results validate the effectiveness and superiority of the proposed algorithms.

中文翻译：

带能量接收器的双功能雷达通信系统保密率优化

本文研究了双功能雷达通信系统在同步无线信息和电力传输 (SWIPT) 设置下下行链路传输中的保密率优化。具体来说，基站（BS）在检测目标的同时发送信息和能量信号，其中能量接收器（ER）也充当潜在的窃听者。为了确保安全的信息传输，我们设计了波束形成器，通过在总发射功率预算、BS 的接收信噪比 (SNR) 目标和 BS 的接收能量需求下最大化保密率来避免信息泄漏。急诊室。为了处理原问题中成本函数和约束的非凸性，我们首先通过使用引入的辅助变量对成本函数进行线性化，将问题转换为等效的半定松弛 (SDR) 版本。因此，可以利用现成的半定规划 (SDP) 求解器来获得所需的波束成形矩阵，保证其为 1 阶。为了减轻 SDP 的计算成本，我们通过块坐标下降法和泰勒级数展开进一步提出了次优解。数值结果验证了所提算法的有效性和优越性。我们进一步通过块坐标下降法和泰勒级数展开提出了次优解。数值结果验证了所提算法的有效性和优越性。我们进一步通过块坐标下降法和泰勒级数展开提出了次优解。数值结果验证了所提算法的有效性和优越性。

更新日期：2022-08-14

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