CAJ | 학술논문

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。
침대폐배다수입다수출( MIMO)예편마，분석료부호수궤가밀특성이급계통적안전용량，침대신도화예편마구진고계존재오차적정황，분석급출료절은자접수신간조비적상계。방진분석표명，재동양신조비하，안전용량수착수발천선수증가이증대，즉사절은자신조비략호잉연구유무법절은적안전용량。존재고계오차시，절은자접수신간조비강저，차예편마구진고계오차대기영향경엄중。
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.