计算机应用与软件
計算機應用與軟件
계산궤응용여연건
COMPUTER APPLICATIONS AND SOFTWARE
2015年
6期
140-143,166
,共5页
李秉键%夏文栋%郭其标%任江涛
李秉鍵%夏文棟%郭其標%任江濤
리병건%하문동%곽기표%임강도
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
無線傳感網絡%節點定位%接收信號彊度%能量效率%平方位置誤差下限%功率分配
무선전감망락%절점정위%접수신호강도%능량효솔%평방위치오차하한%공솔분배
Wireless sensor network%Node localisation%Received signal strength indicator (RSSI)%Energy efficiency%Square position lower error bound%Power allocation
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%。
在無線傳感網絡中,節點定位是基于位置的應用基本要求。然而,現多數文獻僅關註定位精度,而忽略瞭能量消耗對定位精度的影響。為此,針對基于接收信號彊度 RSSI(Received Signal Strength Indicator)定位方案,提齣基于平方位置誤差下限 SPEB (Squared Position Error Bound)的優化功率分配 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,將 SPEB 作為評定定位精度的參數,併推導齣 SPEB 錶達式,然後建立優化功率分配的目標函數,併攷慮到錨節點位置存在誤差。倣真結果錶明,提齣的 SPEB-OPA 方案極大地減少瞭功率消耗。噹誤差門限 T =8時,SPEB-OPA 方案的功率消耗比統一功率分配 UPA(Uniform Power allocation)方案減少至50%。
재무선전감망락중,절점정위시기우위치적응용기본요구。연이,현다수문헌부관주정위정도,이홀략료능량소모대정위정도적영향。위차,침대기우접수신호강도 RSSI(Received Signal Strength Indicator)정위방안,제출기우평방위치오차하한 SPEB (Squared Position Error Bound)적우화공솔분배 SPEB-OPA(SPEB-Based Optimal Power Allocation)방안,목적재우최소화능량소모。재 SPEB-OPA 산법중,장 SPEB 작위평정정위정도적삼수,병추도출 SPEB 표체식,연후건립우화공솔분배적목표함수,병고필도묘절점위치존재오차。방진결과표명,제출적 SPEB-OPA 방안겁대지감소료공솔소모。당오차문한 T =8시,SPEB-OPA 방안적공솔소모비통일공솔분배 UPA(Uniform Power allocation)방안감소지50%。
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.