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The growing popularity and use of the radio frequency (RF) in different applications, predominantly in the area of identification and location aware system, has driven many researchers. Versatile qualities, easy availability and simplicity of use have led a spate of development of different systems and technologies based on radio frequency identification (RFID). This paper is an attempt to survey the current research work and the commercially available indoor location aware systems using radio frequency. It compares the leading researches in this area and analyzes them on the four basic criteria.