基于网络编码的双向中继系统节点选择及功率分配策略  

On the Combination of Relay Assignment and Power Allocation in Two-way Network-coded Cooperative Systems

作　　者：楼思嘉 杨龙祥[1] 

机构地区：[1]南京邮电大学江苏省无线通信重点实验室,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2013年第6期14-17,共4页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61071090);国家科技重大专项(2011ZX03005-004-003;2010ZX03001-002-02;2009ZX03001-004-01;2009ZX03007-004);江苏省高校研究生科研创新计划(CXZZ11_0388;CXLX11_0404)资助项目

摘　　要：考虑在多个节点间的中继双向信道中,将中继分配和功率分配结合起来.每一对节点间的通信可以看做是通过一个中继的双向中继信道.中继使用网络编码同时向对应的节点发送信息.中继分配考虑了两种分配方案,第一种方案考虑到了所有节点对和中继的排列组合,选取其中性能最好的一组;第二种方案选取所有排列组合中的一部分,选取性能最好的一组.第二种方案略微降低了整个系统的性能,但是大大降低了运算的复杂度.将功率分配策略和这两种方案结合,进一步优化了整个系统的性能,相比较没有加入功率分配的系统,有大约2～3dB的提升.We considered in this paper combining relay assignment with power allocation for cooperative systems with multiple two-way relay channels.The nodes corresponding to one two-way relay channel communicate with each other through a relay.The relays use network coding to simultaneously transmit the signals corresponding to the pairs they are assigned to.We considered two relay assignment schemes.The first one selects the best one from all possible relay assignment permutations and yields the best performance.The other one considers only a subset of these permutations and selects the best one.The second scheme results in a significant reduction in computations complexity,but causes slightly performance degradation.We combined power allocation with these two schemes to optimize the system performance.Compared to the system without power allocation,this scheme has a 2 ～3 dB increasing.

关 键 词：协作通信 网络编码 双向中继信道 中继分配 功率分配 

分 类 号：TN911.22[电子电信—通信与信息系统]