满足通信安全条件下一种优化用户速率算法

An Optimal User Rate Algorithm Meeting Secure Communication Conditions

针对多用户下行链路的通信安全问题,提出基于D2D协作的满足通信安全的优化用户速率算法(USCD)。假定在多用户下行链路系统中存在多条带外的D2D信道,每条信道选择合法用户将从下行链路所接收的信号进行放大,并转发至其他合法用户。该系统中存在一个关键技术问题:监听者能够窃听到下行链路以及D2D协作链路中所传输的信号。为了解决此监听者窃听问题,USCD算法通过联合优化下行链路的预编码,人工噪声协方差和信号放大系数型,进而在保证通信安全的基础上,最大化用户的最小速率。仿真结果表明,提出的USCD算法的性能优于基准算法。

For secure communication in multi-user downlink systems,optimal user rate algorithm for secure communication based D2D Cooperation(USCD)is proposed.In the multi-user downlink systems,it is assumed that there are out-of-band device-to-device(D2D)channels,the legitimate users are selected by each channel to amplify the received signals from the downlink and to transmit them to the other legitimate users.A key technical problem exists in the system.The listeners can eavesdrop the signals from the downlink as well as D2D cooperation link.In order to tackle the eavesdropping problem by the listeners,USCD algorithm jointly optimizes the downlink precoding,artificial noise covariance,and amplification coefficient type of signals to maximize the minimum rate of users.The simulation results show that the performance of the proposed algorithm is better than that of benchmark algorithm.