无线传感器网络中协作波束形成的能量有效性分析  

Analysis of energy efficiency for cooperative beamforming in wireless sensor networks

作　　者：范建存[1] 殷勤业[1] 王文杰[1] 冯昂[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《通信学报》2008年第11期145-151,共7页Journal on Communications

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2006AA01Z220);国家自然科学基金资助项目(60572046; 60772095) ~~

摘　　要：分析了无线传感器网络中端到端误码率给定情况下协作波束形成的能量效率,给出了不同路径损耗因子和传输距离下的最优协作发射节点个数。首先,综合考虑发射能耗和电路能耗,给出了接近实际情况的系统能耗模型,并推导出系统能耗与误码率之间的近似闭式关系。然后,基于该近似模型,给出了不同路径损耗因子和传输距离下使系统能耗最小的优化协作发射节点个数。理论分析和仿真结果表明:在系统调制方式和误码率给定的情况下,存在着一个临界距离使协作波束形成比非协作传输和协作空时编码都更节能;而且在不同路径损耗因子和传输距离下,存在不同的最优协作发射节点个数使系统能耗最小。The energy consumption of cooperative beamforming was studied under given requirements on the end-to-end bit error rate （BER）, and the optimal numbers of cooperative node were obtained for different propagation environments and transmission distances. Considering both transmit and circuit energies, a practical energy consumption model of cooperative beamforming in WSN was first proposed, and then its closed-form approximate solution was obtained. Based on this model, the energy consumption of cooperative beamforming was minimized by optimizing the numbers of cooperative nodes. Analysis and simulations show that over some distance ranges, cooperative beamforming can achieve energy savings compared with non-cooperative and STBC-based cooperative systems. Moreover, it is showed that there are the optimal numbers of cooperative nodes to minimize the total energy consumption for different propagation environments and transmission distances.

关 键 词：无线传感器网络 协作波束形成 能效分析 协作节点个数选择 

分 类 号：TN911.7[电子电信—通信与信息系统]