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In this paper, the improvement of an indoor localization using a fingerprint technique is proposed. The Radio Frequency IDentification (RFID) system is utilized. In general, the RFID localization can be categorized into two main types: one is the reader localization in which the reader locations will be estimated and one is the tag localization in which the tag locations will be estimation. The selection of these two types depends on the applications. In this paper, the reader localization is considered because of the lower system cost. For the reader localization, although a large number of tags is used, the tag cost is much cheaper than the reader cost.
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