CAJ | 학술논문

当MISO( Multi Input Single Output)系统存在的加性人工噪声服从一般分布时，系统保密容量讨论难度较大。为推导一般意义多天线系统下的保密容量，引入了信道等效特征的概念。利用信道特征阐明了人工噪声方法的物理概念，并推导出了具有普适性的人工噪声方法保密容量上下限，进一步结合熵功率，推导出AWGN信道下的保密容量解析式。理论分析和仿真得出，通过人工噪声可使平均保密容量增大，从而提高MISO系统的安全性。
당MISO( Multi Input Single Output)계통존재적가성인공조성복종일반분포시，계통보밀용량토론난도교대。위추도일반의의다천선계통하적보밀용량，인입료신도등효특정적개념。이용신도특정천명료인공조성방법적물리개념，병추도출료구유보괄성적인공조성방법보밀용량상하한，진일보결합적공솔，추도출AWGN신도하적보밀용량해석식。이론분석화방진득출，통과인공조성가사평균보밀용량증대，종이제고MISO계통적안전성。
When the artificial noise in multi-input single-output( MISO) follows general distribution, the se-curity capacity is hard to be calculated. To deduce the secrecy capacity of general multi-antenna system, this paper presents an equivalent channel characteristic model. This model is used to describe intrinsically how the artificial noise method makes the wireless communication more safe. And the upper/lower limit of secrecy capacity is deduced. Then, with the entropy power,the analytic expression of secrecy capacity in AWGN channel is deduced. The theoretic and simulation analysis show that in a power limited system, the artificial methods can increase the average secrecy capacity and improve the security of MISO system.