摘要
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。
When the artificial noise in multi-input single-output（MISO） follows general distribution, the security 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 intrinsicallyhow the artificial noise method makes the wireless communication more safe. And the upper/ lower limit ofsecrecy capacity is deduced. Then, with the entropy power,the analytic expression of secrecy capacity inAWGN channel is deduced. The theoretic and simulation analysis show that in a power limited system, theartificial methods can increase the average secrecy capacity and improve the security of MISO system.
出处
《电讯技术》
北大核心
2014年第2期189-194,共6页
Telecommunication Engineering
基金
河南省科技厅科技攻关项目(122102210142)~~
关键词
MISO系统
保密容量
物理层安全
人工噪声
MISO system
secrecy capacity
physical layer security
artificial noise
