无线传感网中虚拟V-BLAST发射能量分配研究  

Transmit Power Allocation for Virtual V-BLAST System in Wireless Sensor Networks

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

机构地区：[1]中科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：《系统仿真学报》2008年第16期4421-4424,共4页Journal of System Simulation

基　　金：国家高技术研究发展计划("863"计划)(2006AA01Z216)

摘　　要：针对无线传感器网络能量受限的问题,提出一种适用于无线传感网的虚拟V-BLAST系统,并研究使各个传感器节点信号误码率最小的功率分配算法。提出了基于Karush-Kuhn-Tucker(KKT)条件的最优功率分配方案和基于等信干噪比(SINR)的次优功率分配方案。仿真结果表明,采用发射功率分配的虚拟V-BLAST系统比传统等功率分配V-BLAST系统传输质量有了很大的提高,在相同误码率要求下,可以减少发射功率,延长网络寿命。Considering energy-constraint problem in wireless sensor networks, a virtual V-BLAST system, which is applicable to wireless sensor networks, was presented, and the transmit .power allocation （TPA） scheme for bit-error rate （BER） minimization of each sensor node was investigated. An optimal scheme based on KKT condition, as well as a suboptimal scheme based on equal signal-interfere-noise ratio （SINR） were proposed. Simulations show that the virtual V-BLAST system adopting the proposed TPA scheme provides a significant improvement in transmission performance compared with the conventional V-BLAST system with equal power allocation scheme. When system BER is given, the TPA proposed will save each sensor node＇s transmitting power, so as to prolong lifetime of wireless sensor networks.

关 键 词：无线传感器网络 V-BLAST 发射功率分配 虚拟MIMO 

分 类 号：TN914.5[电子电信—通信与信息系统]