CTohnicslupsaipoenrs has presented an indoor positioning method using passive UHF RFID. However, there are two problems that passive RFID encounters when used in an indoor location. The first probleTmhiiss pthaaptetrhheaRs SpSrevsaelnuteedofaRnFiInDdoisoerapsiolsyitaioffneicntegdmbeyththoed suu...