Carrier Frequency Recovery for Nyquist and Faster-than-Nyquist Signaling System

摘要

Proposed is a new estimator for the carrier frequency recovery in Nyquist and faster-than-Nyquist (FTN) signaling system. Considering the intentional inter-symbol interference caused by FTN, a discrete-time model for synchronization of FTN is built for the first time, which is different from the traditional model based on the Nyquist criterion. The discrete-time model is simplified assumed that the frequency offset is much smaller than the sampling rate and the shaping pulse is time-truncated adopted from the 3GPP standard. Furthermore, a novel frequency estimator with three discrete Fourier transform samples interpolation is proposed for FTN signaling over the additive white Gaussian noise channel. Comparing with the Cramer-Rao bound, numerical results show the performance of new frequency estimator in the transmission system with the Nyquist rate and beyond the Nyquist rate.