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- In recent years, an indoor positioning system has been widely used in medical, industrial, public safety and transportation. In addition, its important requirement is high accuracy in dense multipath fading environments. This paper studies on indoor positioning using radial basis function (RBF) neural network and k-nearest-neighbor (k-NN) based on ultra wideband (UWB) signal. The channel transfer function was measured using vector network analyzer (VNA) at the frequency ranging from 3 GHz to 11 GHz. The path losses and the delay times of first three paths were investigated to build the fingerprints and signatures. The accuracy of this work is studied and shown in the term of cumulative distribution function (CDF). From the results, RBF neural network provides better accuracy than k-NN. Thus, RBF neural network is more suitable for an indoor positioning.
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