基于实干扰对齐技术的两用户中继辅助信道的安全自由度分析

中继辅助信道是无线通信中的一种重要信道模型?针对源端与目的端有直接链路的两用户中继辅助干扰信道模型,2个合法发送端分别将保密信息通过中继发送给对应的期望接收端,而不希望被非期望接收端窃听到保密信息?结合实干扰对齐技术和协作干扰技术,从保密速率和安全自由度(secure degrees of freedom,S-DOF)2个指标来研究该模型的安全性能,使接收端能分离出期望信号,而非期望信号与协作干扰信号在接收端完美对齐?该方案中,中继采用放大转发的方式,同时发送一个协作干扰信号?然后设计实干扰对齐方案,分析得出系统的总安全自由度为1?

Secure degrees of freedom of two-user relay-assisted channel based on real interference alignment

Relay-assisted channel is an important model in wireless communication. For two user relay-assisted interference channel with direct link between source and destination,the two legitimate transmitter will send confidential message to the desired receiver through the relay.We study the achievable secure rate and secure degrees of freedom of the model by combining real interference alignment and cooperative jamming technology.Then desired signal can be divided at receiver,undesired signal and cooperative jamming signal can aligned at receiver perfectly. In this scheme,the relay uses amplify-and forward protocol,and sends a cooperative jamming signal at the same time.Then we design the real interference alignment scheme,it can calculate that the sum secure degrees of freedom of the model is 1.