Title :
Modified nonlinear least square approaches to carrier frequency offset estimation in OFDM systems
Author_Institution :
Singapore Res. Lab., SONY Electron. (S) Pte. Ltd., Singapore, Singapore
fDate :
4/1/2003 12:00:00 AM
Abstract :
Two modified nonlinear least square (NLS) estimators for carrier frequency offset (CFO) in orthogonal frequency-division multiplexing (OFDM) systems are proposed. In the modified NLS CFO estimators, slot elements in an OFDM block symbol are weighted in terms of their received energies. Simulation results show that the proposed new estimators outperform the original one especially in a low signal-to-noise ratio range.
Keywords :
OFDM modulation; frequency estimation; least squares approximations; noise; OFDM block symbol; OFDM systems; SNR; carrier frequency offset estimation; low signal-to-noise ratio; modified NLS CFO estimators; modified nonlinear least square estimators; orthogonal frequency-division multiplexing; received energy; simulation results; slot elements; AWGN; Additive white noise; Digital video broadcasting; Discrete Fourier transforms; Frequency division multiplexing; Frequency estimation; Gaussian noise; Least squares approximation; OFDM; Signal to noise ratio;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2003.811193
