Destination-Aided Cooperative Jamming for Dual-Hop Amplify-and-Forward MIMO Untrusted Relay Systems
Destination-Aided Cooperative Jamming for Dual-Hop Amplify-and-Forward MIMO Untrusted Relay Systems
复制标题
双跳放大转发 MIMO 不可信中继系统的目的地辅助协作干扰
DOI：
10.1109/tvt.2015.2490099
复制
发表时间：
2016-09-01
影响因子：
6.8
通讯作者：
Wei, Jibo
中科院分区：
文献类型：
--
作者：
Xiong, Jun;Cheng, Longwang;Wei, Jibo
在本文中，我们考虑一个双跳放大转发（AF）多输入多输出（MIMO）中继网络，其中的源，中继和目的地都配备了多个天线。如果中继愿意将信号转发到目的地，并且同时充当潜在的窃听者来解释来自源的消息，则中继是不可信的。由于源和目的地之间不存在直接链接，因此无法获得正保密率。针对这个问题，我们提出了一个联合的目的地辅助合作干扰和预编码在源和中继方案：联合源，中继和目的地预编码（JP）。我们的目标是通过联合设计源、中继和目的预编码矩阵来最大化保密率，并提出一种交替迭代优化算法来解决非凸问题。然后，在高信噪比（SNR）制度的渐近性能进行了全面的研究。特别是，我们提出了简单的封闭形式的表达式的两个关键性能参数的渐近保密率，即，高SNR斜率和高SNR功率偏移。最后，数值结果证明了所提出的安全方案的有效性和性能分析。
In this paper, we consider a dual-hop amplify-and-forward (AF) multiple-input-multiple-output (MIMO) relay network, where the source, relay, and destination are each equipped with multiple antennas. The relay is untrusted if it is willing to forward the signal to the destination and, at the same time, acts as a potential eavesdropper to interpret the message from the source. Since there exists no direct link between the source and the destination, a positive secrecy rate cannot be obtained. Addressing this issue, we propose a joint destination-aided cooperative jamming and precoding at both the source and the relay scheme: joint source, relay, and destination precoding (JP). We target at maximizing the secrecy rate by jointly designing the source, relay, and destination precoding matrices and propose an alternating iterative optimization algorithm to tackle the nonconvex problem. Then, a comprehensive study on the asymptotic performance is conducted in a high signal-to-noise ratio (SNR) regime. In particular, we present simple closed-form expressions for the two key performance parameters in the asymptotic secrecy rate, i.e., the high-SNR slope and the high-SNR power offset. Finally, numerical results are conducted to demonstrate the validity of the proposed secure scheme and its performance analysis.