基于分层编码的物理层安全多播算法

多播系统的保密容量受限于系统中最差用户的信道质量,并且传统的添加人工噪声的物理层安全单播技术不能直接应用于多播传输中。为了解决以上问题,该文提出一种基于分层编码的物理层安全多播算法。该算法在保障用户不同的保密QoS需求的前提下,最大化系统保密容量。从仿真分析看,本文的次优化算法的系统性能十分接近最优化算法,并且计算复杂度明显降低;与此同时,算法功效超出了传统安全多播算法。

Layered Coding Based Physical Layer Secure Multicast Algorithm

The total security throughput of multicast group is limited by the users with the worst channel quality. Moreover, traditional the artificial noise of physical layer security techniques for unicast transmission, do not apply well to multicast transmission. To solve this problem, we consider a layered coding based physical layer secure multicast algorithm. The algorithm can max security throughput of the entire multicast group, while ensuring the security of all users' quality of service (QoS) requirements. The simulation results show that the performance gap between the optimal algorithm and the suboptimal algorithm is very small. Moreover, the computational complexity of suboptimal algorithm is obviously reduced. The proposed algorithm is much better than the conventional multicast security scheme (CMSS). In addition, it achieves more throughput than another algorithm.