TY - JOUR
T1 - A frequency offset estimation technique based on frequency error characterization for OFDM communications on multipath fading channels
AU - Lin, Jia Chin
N1 - Funding Information:
Manuscript received July 26, 2005; revised November 21, 2005 and January 31, 2006. This work was supported in part by the National Science Council, Taiwan, R.O.C. under Contract NSC 94-2213-E-008-045 and in part by the Taiwan Merit Scholarships under Contract TMS094-1-B-002. This paper was presented in part at the IEEE International Conference on Communications (ICC) 2004, Paris, France, June 2004, and at the ICC 2006, Istanbul, Turkey, June 2006. The review of this paper was coordinated by Prof. G. Saulnier.
PY - 2007/5
Y1 - 2007/5
N2 - A novel frequency offset estimation technique based on maximum-likelihood estimation for wireless orthogonal frequency division multiplexing communications on frequency-selective fading channels is proposed. By taking advantage of subcarrier-level differential operation and coherent error characterization, the proposed estimator based on the frequency error characteristics can effectively overcome multipath fading effects. Frequency error characterization is achieved by means of pseudonoise matched filters in the frequency direction; thus, the proposed estimation technique exploits frequency diversity without assistance in the form of accurate timing information. In addition, the proposed technique can combat the rapid time selectivity caused by a wide Doppler spread because it requires channel stationarity for only a short duration due to the exploitation of both a single preamble in its training operation and the following semiblind estimation aided from several pilot subchannels. The proposed technique can easily switch between training mode and semiblind mode by sharing the same system architecture. Extensive simulation results in conjunction with statistical analysis verify the superiority of the proposed technique.
AB - A novel frequency offset estimation technique based on maximum-likelihood estimation for wireless orthogonal frequency division multiplexing communications on frequency-selective fading channels is proposed. By taking advantage of subcarrier-level differential operation and coherent error characterization, the proposed estimator based on the frequency error characteristics can effectively overcome multipath fading effects. Frequency error characterization is achieved by means of pseudonoise matched filters in the frequency direction; thus, the proposed estimation technique exploits frequency diversity without assistance in the form of accurate timing information. In addition, the proposed technique can combat the rapid time selectivity caused by a wide Doppler spread because it requires channel stationarity for only a short duration due to the exploitation of both a single preamble in its training operation and the following semiblind estimation aided from several pilot subchannels. The proposed technique can easily switch between training mode and semiblind mode by sharing the same system architecture. Extensive simulation results in conjunction with statistical analysis verify the superiority of the proposed technique.
KW - Cramér-Rao Lower Bound (CRLB)
KW - Differential operation
KW - Doppler spread
KW - Error characteristics
KW - Frequency offset
KW - Frequency-selective fading
KW - Maximum likelihood (ML)
KW - Orthogonal frequency division multiplexing
KW - matched filters (MF)
UR - http://www.scopus.com/inward/record.url?scp=34249656793&partnerID=8YFLogxK
U2 - 10.1109/TVT.2007.895501
DO - 10.1109/TVT.2007.895501
M3 - 期刊論文
AN - SCOPUS:34249656793
SN - 0018-9545
VL - 56
SP - 1209
EP - 1222
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 3
ER -