Because of the advantages on power and cost on sensor node, this thesis focuses the investigation on the range-free algorithms for WSN. The main research the flat iron shop for us works are as below:(1) Analyzing the basic principles and key technologies of localization in wireless sensor networks, summarizing both advantages and disadvantages of the exiting algorithms.(2) The mechanism of custom made prom dresses DV-Hop algorithm is analyzed and a comparison with its improved version also presented in the paper.(3) Proposing a DV-Hop improved algorithm based on the RSSI quantitative model. The main principle of the new algorithm is the introduction of RSSI to improve the positioning accuracy. The Analysis and Simulation results show that the new algorithm can improve the blog new shirts 2010 accuracy of the localization.(4) Chan algorithm is introduced here to replace the triangulation discount wedding gowns algorithm. Refinement method is although introduced here to improve the accuracy of the sensor positioning. The simulation results show that: the wedding dresses form china new algorithm can improve the accuracy of cheap polo shirts positioning to some online shoes store extent.(5) Extended the ad-hoc simulation platform of the University of Geneva -AlgoSenSim,Comparing and analyzing the characteristics of these two algorithms, the simulation results show that both improved algorithms have a better feasibility and practicability.
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