基于中继间干扰消除的轮流转发系统安全传输方案

Successive relaying secure transmission scheme based on inter-relay interference cancellation

针对轮流转发系统中非信任中继窃听的问题,提出一种基于中继间干扰消除的安全传输方案。首先,利用可信中继与非信任中继交替转发产生的中继间干扰,恶化非信任中继的窃听条件。然后,利用信号在时域上的相关性进行干扰迭代消除,完全消除合法用户处中继间干扰,提升合法用户接收信号质量。在此基础上,提出了以最小化窃听和容量为目标的快速功率分配算法。分析和仿真结果表明,方案在保障通信效率的同时抑制了非信任中继的窃听,在仿真条件下,系统的保密速率提升了至少2 bit·s-1·Hz-1。

A secure scheme based on inter-relay interference cancellation was proposed to solve untrusted relay eavesdropping problem in successive relaying systems.First inter-relay interference between trusted relay and untrusted relay was exploited as artificial noise to degrade untrusted relay's eavesdropping condition,then interference iterative cancellation was adapted to improve signal quality at legitimate user by making use of correlation between signals in time domain.Based on this,a quick power allocation algorithm aiming to minimize untrusted relay's sum rate was proposed.Analysis and simulation results show that the proposed scheme suppress untrusted relay's eavesdropping without loss of communication efficiency,a promotion of at least2bit·s?1·Hz?1in secrecy rate can be observed.