Spectrum sensing of OFDM signals in the presence of CFO: New algorithms and empirical evaluation using USRP

In this work, we consider spectrum sensing of OFDM signals. We deal with the inevitable problem of a carrier frequency offset, and propose modifications to some state-of-the-art detectors to cope with that. Moreover, the (modified) detectors are implemented using GNU radio and USRP, and evaluated over a physical radio channel. Measurements show that all of the evaluated detectors perform quite well, and the preferred choice of detector depends on the detection requirements and the radio environment.