基于优化动态门限的TOA估计算法

针对脉冲超宽带(IR-UWB)无线传感器网络提出一种新的基于优化动态门限的到达时间估计算法.首先运用能量检测算法检测出直达单径(DP)所在能量块;然后根据峭度、平均附加时延和均方根时延扩展的联合,提取出最优门限值并拟合出动态门限公式,进而估计出DP所在位置;最后以此计算出TOA值.此算法具有复杂度低、精度高的特点.通过仿真对比,验证了算法的优越性.

TOA estimation algorithm based on optimal dynamic threshold

A TOA（time of arrival） estimation algorithm based on dynamic threshold algorithm was proposed for impulse radio ultra-wideband（IR-UWB）.Firstly,the energy block which contains the direct path（DP） was detected by using the energy detection algorithm.Then according to the joint of the kurtosis,the mean excess delay spread and the root mean square delay spread,the optimal threshold value was extracted,the dynamic threshold formula was fitted and the rough location of DP was further estimated.At last,the more accurate location of DP was determined and thereby TOA was estimated.The proposed algorithm has low complexity and high precision.To verify the merit of this algorithm,a simulation is carried out to compare the algorithm with other two ones.