Blind frequency offset recovery in fading channels

Abstract

The paper considers a blind (non-data aided) and open-loop algorithm to estimate frequency offset of a linearly modulated waveform transmitted through fading channels. This method is based on second-order cyclostationarity, and can be used not only in time-selective channels, but also in frequency-selective fading channels. It does not rely on the Gaussian assumption of the complex equivalent low-pass channel process, and does not require the knowledge of the channel. Performance analysis of the proposed algorithm using Monte Carlo simulations in (1) additive white Gaussian noise (AWGN) channel, (2) flat fading channel, and (3) frequency selective fading channel are also reported.