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We 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. Uniqueness and accuracy of timing synchronization, therefore, could be <jats:bold>guaranteed<\/jats:bold>. The performance of the proposed estimator is evaluated by mean square error (MSE) and synchronization probability. The proposed estimator could carry out timing synchronization for MB-OFDM-based UWB systems and make the uniqueness of timing index for sure. The MSEs of the proposed estimator are evidently lower than the reference method for a great deal. Total and exact synchronization probability could get as much as 100 and 96%.<\/jats:p>","DOI":"10.1186\/1687-1499-2012-169","type":"journal-article","created":{"date-parts":[[2012,5,14]],"date-time":"2012-05-14T16:17:36Z","timestamp":1337012256000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A polarity comparison timing synchronization estimation for MB-OFDM-based UWB systems"],"prefix":"10.1186","volume":"2012","author":[{"given":"Xue","family":"Wang","sequence":"first","affiliation":[]},{"given":"Zhihong","family":"Qian","sequence":"additional","affiliation":[]},{"given":"Yijun","family":"Wang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2012,5,14]]},"reference":[{"key":"333_CR1","unstructured":"Federal Communications Commission Technical, Revision of part 15 of the commission's rules regarding Ultra-Wideband transmission systems First report and order, FCC 02-48, Washington DC, USA; 2002."},{"issue":"2","key":"333_CR2","doi-asserted-by":"publisher","first-page":"36","DOI":"10.1109\/4234.660796","volume":"2","author":"MZ Win","year":"1988","unstructured":"Win MZ, Scholtz RA: Impulse radio: how it works. 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