基于分离信源信道码的相关信源在有噪广播信道下的可靠和安全传输  

Secure lossless transmission of correlated sources over noisy broadcast channel using separate source-channel coding

作　　者：郎非[1] 王保云[1,2] 邓志祥[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2013年第10期17-27,共11页Journal on Communications

基　　金：国家自然科学基金资助项目(61271232;60972045;61071089);东南大学移动通信国家重点实验室开放研究基金资助项目(2012D05)~~

摘　　要：从信息论的角度对相关信源在离散无记忆广播信道下可靠和安全传输的问题进行研究。2个信源经过有噪信道分别到达各自指定的目的节点并被无损恢复,同时还要保证信源信息对于非指定的目的节点要有一定的保密性。采用信源信道分离的随机码策略,得到相关信源在一般广播信道下能够可靠和安全传输的充分条件。当2个信源的公共信息为二者的互信息时,可获得最佳压缩传输效率,并且能够做到信源信息传输的部分绝对保密。当广播信道采用退化信源集或满足more capable广播信道性质时,得到了可靠和安全传输的充分必要条件,此时分离信源信道码为最优码。Abstraet： The problem of secure transmission of correlated sources over broadcast channel was studied from the per- spective of information-theoretic se6urity. Each source is only for its intended receiver, but to be kept secret from the un- intended receiver. Sufficient condition was provided for secure transmission of correlated sources over broadcast channels from separate source-channel coding perspective. If the mutual information was chosen as common information, optimal compression and partial perfect secrecy were both achieved for two correlated sources. Sufficient and necessary condi- tions were provided for two special cases： a broadcast channel with degraded source sets and a more capable broadcast channel, and thus it could be seen that the seoarate source-channel code is ontimal.

关 键 词：分离信源信道码 安全传输 广播信道 疑义度 香农理论 

分 类 号：TN911.22[电子电信—通信与信息系统]