多载波NOMA安全通信系统稳健性资源分配算法

Robust resource allocation algorithm for multicarrier NOMA security communication system

为提升无线网络频谱利用率和增强信息传输的安全性,针对下行多载波非正交多址接入安全通信系统,提出了一种基于安全和速率最大化的稳健性资源分配算法。首先,设计人工噪声(AN)预编码矢量与合法用户信道正交,消除人工噪声对合法传输的影响。然后,考虑每个用户最小速率约束、基站最大功率约束,基于窃听信道不确定性建立AN预编码、下行数据预编码和子载波分配联合优化问题模型。为求解该非凸问题,将其分解为预编码优化和子载波分配2个子问题进行联合优化,基于S-procedure和块坐标下降算法对预编码优化问题进行求解,基于动态匹配理论进行子载波分配。研究结果表明,所提算法具有很好的稳健性,能够有效提高系统安全和速率。

To improve the spectrum efficiency and enhance the information security of wireless network,a sum secrecy rate maximization-based robust resource allocation algorithm was proposed for a downlink multicarrier NOMA security communication system.Firstly,the artificial noise(AN)precoding vector was designed to be orthogonal to the legitimate channel,so that the legitimate transmission would not be affected by the AN.Then,considering the constraints of rate requirement of each user and the maximum transmit power of base station,a joint AN precoding,downlink data precod-ing and subcarrier allocation optimization problem was formulated under eavesdropping channel uncertainties.To solve that non-convex problem,it was decomposed into two joint optimization subproblems:precoding optimization and sub-carrier allocation.The former was solved based on S-procedure and block coordinate descent(BCD)algorithm,the lat-ter was solved by dynamic matching theory.Simulation results demonstrate that the proposed algorithm has good robust-ness and can effectively improve the sum secrecy rate.