USRP based OFDM radar systems for doorway detection

This paper discusses the implementation of open doorway detection in an indoor environment by utilizing the low cost narrow band radar system, i.e. USRP (Universal Software Radio Peripheral) based test bed. OFDM waveform is considered due to its flexibility of subcarrier occupation and ability of reusing the same waveforms as communication signals. We propose power comparison detection method and ranging detection method with the comparison between these two methods. The results show that our proposed method can work well under indoor fading environment. This scenario allows for the development of an autonomous detection robotics in an indoor unknown environment.