一种提高多用户MIMO广播信道安全性能的方案

无线通信的广播特性使得信息容易被非法用户窃听,研究多天线抗窃听技术非常重要。多用户MIMO(MU-MIMO)系统采用块对角化(BD)预编码,可以实现下行链路小区用户之间的防窃听,但是不属于下行链路小区用户的恶意窃听者截获到用户的信道信息时,则很容易窃听到发送给用户的信息。文中通过改进物理层技术保证信息数据安全保密的传输,仿真验证该方案具有很好的抗窃听性能。

A Scheme for Improving Security Performance of Multi-user MIMO Broadcast Channel

Broadcasting nature of wireless communication makes the communication information easily eavesdropped by illegal user, thus it is of great significance to develop multi-antenna anti-hacking technology.By using BD (Block Diagonalization) precoding, MU-MIMO system can achieve anti-eavesdropping of among the downlink cell users. However,the malicious eavesdropper not belonging to the downlink cell users could eavesdrop the users’ channel information,and this would result in easy wiretap of communication information. By combining encryption technology with physical layer technology,the secure transmission of information data is ensured.And simulation shows that the proposed scheme can achieve fairly good anti-hacking performance.