TY - JOUR
T1 - Performance study of residual carrier frequency offset estimation methods in OFDM WLAN systems
AU - Cheng, Qi
PY - 2013
Y1 - 2013
N2 - Residual carrier frequency offset accumulates with time and leads to bit errors on later symbols in an OFDM packet. This paper is concerned with two methods for residual carrier frequency offset estimation, based on the DFT demodulated data of OFDM data symbols at the pilot subcarriers. One method computes an estimate from the phase difference between the data in two (or more) consecutive symbols. The other one, which was recently proposed, finds an estimate from the phase of the data in one (or more) symbol. The latter method requires the a priori knowledge or an estimate of the channel while the former does not. The two methods have been compared by first-order perturbation analysis and simulation. A flaw of the latter method has been identified. Preference should be given to the former method in terms of estimation accuracy and ease of implementation in practical scenarios.
AB - Residual carrier frequency offset accumulates with time and leads to bit errors on later symbols in an OFDM packet. This paper is concerned with two methods for residual carrier frequency offset estimation, based on the DFT demodulated data of OFDM data symbols at the pilot subcarriers. One method computes an estimate from the phase difference between the data in two (or more) consecutive symbols. The other one, which was recently proposed, finds an estimate from the phase of the data in one (or more) symbol. The latter method requires the a priori knowledge or an estimate of the channel while the former does not. The two methods have been compared by first-order perturbation analysis and simulation. A flaw of the latter method has been identified. Preference should be given to the former method in terms of estimation accuracy and ease of implementation in practical scenarios.
UR - http://handle.uws.edu.au:8081/1959.7/528854
U2 - 10.1016/j.dsp.2013.01.001
DO - 10.1016/j.dsp.2013.01.001
M3 - Article
SN - 1051-2004
VL - 23
SP - 981
EP - 993
JO - Digital Signal Processing
JF - Digital Signal Processing
IS - 3
ER -