作　　者： ; ; ;

机构地区： 哈尔滨工业大学

出　　处： 《通信学报》 2009年第8期96-104,共9页

摘　　要： 针对无线传感器网络节点低成本、低运算能力的特点,基于脉冲超宽带技术的无线传感器网络提出了一种基于能量检测的两步测距法。这种方法针对DP(direct path)分量进行TOA(time of arrival)估计,具体包含对DP所在能量块的广义似然比检验和能量块内对DP精确位置的极大似然估计两部分。给出了DP能量块检测概率和估计结果的闭合表达式,通过理论和数值分析了积分长度等系统参数对于TOA估计性能的影响,并建立了估计误差的数学模型。最后通过仿真结果进行了性能比较,并验证了分析结论。与传统方法比较的结果表明,该算法可以在复杂度较低的条件下取得一定的性能提升。 In order to design a low computational and cost ranging method for the IR-UWB （impulse radio ultra wide- band） wireless sensor network, a two-step DP （direct path） component TOA （time of arrival） estimation algorithm based on energy detection was proposed. The first step was to determine DP energy block in which located by GLRT （general- ized likelihood ratio test）. During the second step, the refined position of DP within the detected block was obtained by ML （maximum likelihood） estimation. A mathematical error model was set up for the two-step method which was veri- fied by the simulation results, and system parameters that affected the performance were studied by analytical and nu- merical methods. The results, compared with traditional ranging methods, show that this method achieves relative high performance under low complexity conditions.

关 键 词： 无线传感器网络 脉冲超宽带 能量检测 测距 到达时间估计

领　　域： [电子电信] [电子电信]