An OFDM Sub-carrier Number Estimation Method Based on Novel Distance

Abstract

Aiming at the problem of orthogonal frequency Division multiplexing (OFDM) signal subcarrier number estimation, a subcarrier number estimation method based on Novel Test (NT) distance is proposed using the Gaussian nature of OFDM signal. The NT distance output at detection-end DFT module is smallest when DFT points match the transmitter. Theoretical analysis and simulation results show that this method can distinguish Gaussian distribution from non-Gaussian distribution, and correctly estimate the number of subcarriers of OFDM signal.