摘要
提出一种基于物理信道的安全空时网络编码方案。该方案利用信道互易性,将合法发送者和接收者之间共同的有效信道衰落系数作为安全密钥源。合法收发节点利用它们之间的信道生成密钥,并根据生成的密钥确定发送信号的旋转角度。旋转角度来自与发送符号相同的星座,使得旋转之后的符号仍然属于原来的星座点集合。由于窃听节点与合法收发对之间的信道是互相独立的,因此窃听节点很难获得合法收发节点之间的密钥。基于上述的星座旋转,所提安全空时网络编码能够保证各中继节点在异步传输的前提下,目的节点仍然获得满分集,而窃听节点不能获取任何有用信息。仿真结果验证了安全空时网络编码方案的合理性。
A secure Space-Time Network Coding （STNC）scheme is proposed by exploiting physical channels.Based on the as-sumption of channel reciprocity,the basic idea is to share the effective channel fading coefficient between the transmitter and the receiver and use it as the source of secret key.The rotation is also from the PSK constellation,thus the rotated constellation is the same as the original one.Since the eavesdropper’s channel is typically independent of the legitimate channel,which is the channel between the legitimate transmit-receive pair,the eavesdropper can hardly get the secret key.By using the proposed rota-tion,the secure STNC scheme can guarantee full diversity at the receiver while low interception probability at the eavesdropper. Simulation results are presented to verify the performance of the proposed secure STNC scheme.
出处
《中国科技论文》
CAS
北大核心
2014年第7期749-753,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(61302067)
高等学校博士学科点专项科研基金资助项目(20130201120020)
中央高校基本科研业务费专项资金资助项目
关键词
无线通信
物理层安全
空时网络编码
wireless communication
physical layer security
Space-Time Network Coding
