摘要
针对闭环多输入多输出(MIMO)预编码,分析了符号随机加密特性以及系统的安全容量,针对信道和预编码矩阵估计存在误差的情况,分析给出了窃听者接收信干噪比的上界。仿真分析表明,在同样信噪比下,安全容量随着收发天线数增加而增大,即使窃听者信噪比略好仍然具有无法窃听的安全容量。存在估计误差时,窃听者接收信干噪比降低,且预编码矩阵估计误差对其影响更严重。
For closed-loop multiple-input multiple-output( MIMO) precoding,the random symbol encryp-tion and the secrecy capacity are analyzed. For receiver with channel and precoding matrix estimation er-ror,an upper bound of eavesdropper signal-interference-noise ratio( SINR) is derived. Simulation results show that the secrecy capacity increases with the increase of the numbers of transmitting and receiving an-tennas,the eavesdropper couldn’t intercepte the information even if it has higher signal-to-noise ratio ( SNR) . The estimation error will lead to the decrease of eavesdropper SINR,and the influence of the pre-coding matrix estimation error is even worse.
出处
《电讯技术》
北大核心
2015年第7期725-729,共5页
Telecommunication Engineering
