An improved algorithm was proposed by analyzing the deficiencies of traditional DV-Hop algorithm in terms of random distribution,which owns improvements over two aspects. Firstly,instead of variance or deviation,the average one-hop distance is estimated by minimum mean-squared error criterion( MMSE). Secondly,in order to reflect the different effects of each beacon node on unknown nodes,inverse distance weighting method is adopted to deal with the average one-hop distance. Improved algorithm is simulated on...