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The authors propose a new approach for timing synchronization estimation with polarity comparison for Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM)- based UWB systems. They attempt to locate the start sample of frame sequences by calculating difference of the two cross-correlation functions, between received symbols, the successive received symbols, and predefined preamble sequence. It makes sense to propose polarity comparison and identification ideas to the scenario, the cross-correlation difference exceeding predefined threshold is not unique. If polarities of selected symbols are not all the same, the estimator is put forward to find out a peak of correlation summation to figure out the unique timing point and promote synchronization accuracy.
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