基于平方位置误差下限的优化功率分配方案  

OPTIMISED POWER ALLOCATION ALGORITHM BASED ON SQUARE POSITION LOWER ERROR BOUND

作　　者：李秉键[1] 夏文栋[1] 郭其标[1] 任江涛[2] 

机构地区：[1]嘉应学院计算机学院,广东梅州514015 [2]中山大学信息科学与技术学院,广东广州510275

出　　处：《计算机应用与软件》2015年第6期140-143,166,共5页Computer Applications and Software

基　　金：国家自然科学基金项目(61173135)

摘　　要：在无线传感网络中,节点定位是基于位置的应用基本要求。然而,现多数文献仅关注定位精度,而忽略了能量消耗对定位精度的影响。为此,针对基于接收信号强度RSSI(Received Signal Strength Indicator)定位方案,提出基于平方位置误差下限SPEB(Squared Position Error Bound)的优化功率分配SPEB-OPA(SPEB-Based Optimal Power Allocation)方案,目的在于最小化能量消耗。在SPEB-OPA算法中,将SPEB作为评定定位精度的参数,并推导出SPEB表达式,然后建立优化功率分配的目标函数,并考虑到锚节点位置存在误差。仿真结果表明,提出的SPEB-OPA方案极大地减少了功率消耗。当误差门限T=8时,SPEB-OPA方案的功率消耗比统一功率分配UPA(Uniform Power allocation)方案减少至50%。Sensor nodes positioning is a fundamental requirement of location-based applications in wireless sensor networks.However,now most of the literatures only focus on positioning accuracy,but the impact of energy consumption on positioning accuracy is overlooked.There-fore,for RSSI-based positioning scheme,we introduced an optimised power allocation scheme which is based on square position lower error bound （SPEB-OPA）,aimed at minimising the energy consumption.In SPEB-OPA algorithm,we used SPEB as the parameter for estimating positioning accuracy,and deduced the SPEB expression.Then we set up the objective function of the optimised power allocation,and consid-ered the errors existed in positions of anchor nodes.Simulation results showed that the proposed SPEB-OPA scheme greatly decreased the power consumption.When the error threshold T =8,the power consumption of SPEB-OPA scheme was reduced to 50% of that of uniform power allocation （UPA）scheme.

关 键 词：无线传感网络 节点定位 接收信号强度 能量效率 平方位置误差下限 功率分配 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]