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ML estimation of non-virtual sub-carriers OFDM carrier frequency offset

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3 Author(s)
Bo Hong ; The Key Lab of Integrated Microsystem Science & Engineering Applications, PKU shenzhen graduate school, Shenzhen 518055, China. hongbo@ime.pku.edu.cn ; Xin'an Wang ; Gaofa Xiao

In OFDM system, because of sensitivity to carrier frequency offset, frequency offset must be compensated before DFT in the receiver. In this paper, we present a maximum likelihood estimation for carrier frequency offset, based on OFDM symbol has no virtual sub-carriers. The estimation are compose of two parts, blind estimation makes use of cyclic prefix for every symbol and data-aid estimation makes use of two consequent OFDM symbols which are similar or relative to each other. Data-aid estimation performs well and simulation result converges upon Cramer-Rao lower bound. Blind estimation performs inferior, but it can be used in tracking mode.

Published in:

Mobile Computing and Wireless Communication International Conference, 2006. MCWC 2006. Proceedings of the First

Date of Conference:

17-20 Sept. 2006