频率选择性信道下基于虚拟MIMO-STBC的无线传感器网络中功率分配的研究  

On power allocation for virtual MIMO-STBC based wireless sensor networks over frequency-selective fading channels

作　　者：严凯[1] 邱云周[1] 丁盛[1] 朱明华[1] 刘海涛[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所无线传感网与通信重点实验室,上海200050

出　　处：《高技术通讯》2008年第7期689-693,共5页Chinese High Technology Letters

基　　金：863计划(2006AA01Z216)资助项目

摘　　要：结合频域均衡(FDE)研究了在频率选择性衰落信道下基于虚拟 MIMO-STBC 的无线传感器网络的功率分配(PA)方案。利用从目标簇反馈回信源簇的信道状态信息,在协同传输节点总发送功率一定的情况下,通过最大化信宿节点接收到数据的信噪比推导出了一种基于滤波器组频域加权的 PA 方案。仿真结果表明,在系统一定的误码率要求下,采用这种 PA 方案的无线传感器网络所需要的发射功率要少于等 PA 方案所需要的发射功率,从而减少了无线传感器网络的能耗。The problem of power allocation （PA） in virtual multiple-input-multiple-output （MIMO）-space-time block codes （STBC） based wireless sensor networks （WSN） over frequency-selective fading channels was studied in the light of the frequency-domain equalization （FDE） technology. With the channel state information fed from the destination cluster to the source cluster, a novel PA scheme based on the frequency-weighted approach was derived by maximizing signal-to-noise ratio （SNR） for block-wise received data at the sink node under a given total transmission power constraint at the cooperative transmitting nodes. The analysis and simulation results demonstrate that the proposed frequency-weighted based PA scheme can provide significant performance enhancement over the uniform PA case, thus energy saving is achieved for WSN.

关 键 词：虚拟多输入多输出 功率分配 频域均衡 空时分组码 无线传感器网络 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置] TN929.5[自动化与计算机技术—控制科学与工程]