基于渗流方法的新型反截获抗干扰通信技术研究

项目名称： 基于渗流方法的新型反截获抗干扰通信技术研究

项目编号： No.61271258

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 王爱华

作者单位： 北京理工大学

项目金额： 75万元

中文摘要： 无线环境的开放性和发送天线的各向发散性使通信信号很容易被截获,从而传输信息被非法获取；同时，无线传播环境复杂，干扰信号使信道容量下降、有用信号阻塞，信号的有效接收变得十分困难。因此，通信系统应具备反截获和抗干扰能力。本项目提出一种基于物理层的新型反截获抗干扰通信技术，其基本思想是将源数据经过无比率信道编码后通过渗流方式分路，由网络中的多个路由并行转发，目的节点将各路转发来的数据进行"组装"并解码恢复源数据。数据经过渗流传送，由于信息随机分布在多个节点中，信息的分散性使截获者难以获得能够正常译码的完整信号。而且，无比率预编码和各节点的网络编码是随机的，截获者无法掌握信源预编码和物理层编码信息，因而使信息传输具有很强的反截获能力。同时采用级联结构的无比率编码工作在Shannon限附近，信道引入的随机差错在第二级解码器会带来信道散列性，对数据形成很强的保护，从而获得优异的反截获和抗干扰性能。

中文关键词： 抗截获；渗流；抗干扰；无比率编码；

英文摘要： Owing to the openness of the free space and the non-perfect directionality of the transmitting antenna, wireless communications systems are inherently quite vulnerable to unauthorized receivers (a.k.a. interceptors). On the other hand, the achievable channel capacity is often limited by deliberate or non-deliberate interferences which are ubiquitous in today's extremely crowed radio propagation environment. Therefore, the robustness to jammer and interception must be taken into consideration in the design of wireless communications systems. Against this background, in the current proposal we highlight a novel Physical Layer Anti-Jamming and Anti-Interception (PL-AJI) technique. The basic idea is to process the source message by a rateless channel coder and then multiplex the coded data onto a number of percolating channels. With the data packets which arrive along many different routes in the network, the destination node may perform an "assembling" operation and thereby restore the original information-bearing message in a reliable way. As percolation-based transmission is adopted, the coded packets are randomly distributed over a large number of percolation channels, which makes it rather difficult for the interceptors to collect sufficient data for accurate decoding. Furthermore, the cascading rateless codes

英文关键词： Anti-Interception；Percolation；Anti-Jamming；Rateless Code；