Frequency Offset Estimation for MB-OFDM-based UWB Systems

We address low-complexity, highly-accurate frequency offset estimation for MB-OFDM-based UWB systems. We discuss unique characteristics of the MB-OFDM systems, namely, different carrier frequency offsets, different channel responses, different channel energies, and different preamble structures in different frequency bands. Utilizing them, we develop frequency offset estimators based on the best linear unbiased estimation principle. If compared to the conventional estimators using correlation and averaging, our proposed methods achieve better estimation performance for all preamble patterns and the improvement is more significant for the preamble patterns 3 and 4 of the MB-OFDM system in [2].