基于时频资源分配的认知无线中继网络物理层安全研究

提出了一种在认知无线中继网络物理层安全意义下的最优时频资源分配方案。在该方案中,主用户通过次用户的协作进行通信；作为回馈,允许次用户接入该频段传输信息。在次用户网络中,选择两个最优次用户,一个用作协作转发,一个用作协作干扰,同时在保证次用户网络传输速率的条件下,通过寻求系统的最优带宽分配因子、时隙分配因子以及次用户的协作功率,来最大化主用户的安全容量。仿真结果表明,提出的方案切实可行,能够显著提高主用户的安全容量。

Time-bandwidth Allocation Scheme for Physical Layer Security in Cooperative Cognitive Radio Networks

Cognitive radio (CR) technology is one of the strong candidate technologies to solve the spectrum scarcity problems.We proposed a time-bandwidth allocation scheme for physical layer security in cognitive radio networks,in which the primary users (PUs) communicate with the help of the secondary users (SUs).As feedback,PUs share the bandwidth with SUs for the communication of the secondary network.Particularly,we selected two SUs,a relay SU and a jammer SU,to maximize the physical secrecy capacity of the PUs on the premise of meeting the lowest transmission rate requirement of the SUs.The optimal bandwidth allocation factor,time allocation factor and the cooperative power allocation of the SUs were given in this paper.Numerical results show that the proposed scheme can improve the secrecy capacity of the PUs significantly.