基于能量价格的协作OFDM系统资源联合分配方案  

An energy pricing-based jont resource allocation approach for cooperative OFDM systems

作　　者：郭超平[1,2] 韩鹍[2] 李勇朝[1] 李晓艳[1] 张海林[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,西安710071 [2]西安通信学院,西安710106

出　　处：《高技术通讯》2013年第12期1242-1247,共6页Chinese High Technology Letters

基　　金：国家重大科技专项(2013ZX03003008-004);高等学校博士学科点专项科研基金资助课题(20120203110002);新世纪优秀人才支持计划(NCET-12-0918;72131855);国家111创新引智基地(B08038)资助项目

摘　　要：为延长能量受限的使用解码转发协议的OFDM系统的寿命,利用能量价格构建了系统模型,提出了一个实用的资源联合分配方案。该方案有两个算法:算法1采用图论方法为源节点和中继节点的每个子载波对计算最优功率和总能量代价,算法2按照贪婪算法的思想进行子载波配对和模式选择;另外算法2从中继节点的所有子载波中找出总能量代价最小的子载波,接着从与这个子载波对应的中继模式和直传模式中选择总能量代价较小的模式作为源节点信号的传输模式。仿真分析表明,与典型资源分配方案相比,该方案不仅能够均衡节点之间的能量消耗,延长网络的寿命,还能发送更多的数据。In order to prolong the lifetime of energy-constrained OFDM systems under the decode-and-forward protocol, a model for the systems based on energy pricing was formulated, and then a heuristic joint resource allocation scheme was presented. The presented scheme comprises of two algorithms：the first one uses a graphic method to compute the optimal power allocation and the total energy cost for each subcarrier pair between the source and the relay, and the second one makes subcarfier pairing and mode selection according to the greedy algorithm. When using the second algorithon, the relay＇ s subcarrier with the lowest total energy cost is selected for each subcarrier of the source, and the mode used by the source to transmit signals is then selected from the direct mode and the relay mode corresponding with the selected subcarrier. The simulation and analysis show that compared with other algorithms the presented scheme can not only make better balanced use of the energy of the system and make the system＇ s lifetime longer, but also transmit more data.

关 键 词：协作通信 OFDM 解码转发(DF) 子载波配对 功率分配 中继选择 

分 类 号：TN929.53[电子电信—通信与信息系统]