带有广义反馈的多址接入中继信道的可达速率区域的研究  

Achievable Rate Regions for Multiple Access Relay with Generalized Feedbacks

作　　者：郎非[1] 王保云[1] 邓志祥[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,南京江苏210003

出　　处：《信号处理》2012年第7期1021-1028,共8页Journal of Signal Processing

基　　金：国家自然科学基金;项目编号:60972045;项目名称:无线信道中信息理论意义下的安全通信的关键理论和技术研究

摘　　要：多址接入中继信道是含有多个接入节点、1个中继节点和1个目的接收节点的无线多用户信道,同时考虑接入节点之间能够接收彼此含噪的广义反馈信息,此种模型存在于接入节点之间协作通信能力较差的多跳无线网络和无线传感器网络。论文给出了带有此种广义反馈的离散无记忆多址接入中继信道的可达速率区域,并将这一结果推广到高斯信道。提出一个新的编码方案,主要基于速率划分和译码前传策略,并通过采用分组Markov叠加编码建立各接入源节点之间以及源节点和中继节点之间的协作通信,在可达性证明中还采用规则编码和反向译码策略。结果表明,在离散无记忆信道环境下可达速率区域相比较以往结果更具一般性,在高斯信道环境下可达速率区域被扩展。The multiple-access relay channel is a model where multiple sources communicate with a single destination in the presence of a relay node. Simultaneously, we also consider that each source receive message （ namely generalized feed- back） from the other source. Examples of such networks include hybrid wireless sensor and multi-hop networks, where co- operation between the nodes is either undesirable or not possible, but one can use a relay node to aid communication be- tween the sources and the destination. Achievable rate regions for the discrete memoryless multiple access relay channel with generalized feedbacks were derived and it can be also extended to Gaussian channels. Coding scheme based on rate splitting and decode-forward strategies was proposed. Cooperations between the two sources and between source and relay via block Markov superposition encoding enhance communication efficiency. Regular encoding and backward decoding were also in- cluded in this new coding scheme. The results show that the derived achievable region results are more general than previ- ously known results including them as special cases. Furthermore over Gaussian channels, achievable region is expanded.

关 键 词：香农理论 协作通信 中继 广义反馈 可达速率 

分 类 号：TN911.22[电子电信—通信与信息系统]