Performance Comparison of Doppler Scale Estimation Methods for Underwater Acoustic OFDM. (30th May 2012)

• Record Type: Journal Article
• Authors: Wan, Lei; Wang, Zhaohui; Zhou, Shengli; Yang, T. C.; Shi, Zhijie
• Other Names: Tsimenidis Charalampos C. Academic Editor.
• Is Part Of: Journal of electrical and computer engineering. Volume 2012(2012)
• Publication Date: 2012-05-30
• Subjects: Computer engineering -- Periodicals; Electrical engineering -- Periodicals; 621.3905
• DOI: 10.1155/2012/703243
• Languages: English
• ISSNs: 2090-0147

Abstract

Abstract : Doppler scale estimation is one critical step needed by the resampling operation in acoustic communication receivers. In this paper, we compare different Doppler scale estimation methods using either cyclic-prefixed (CP) or zero-padded (ZP) orthogonal-frequency division-multiplexing (OFDM) waveforms. For a CP-OFDM preamble, a self-correlation method allows for blind Doppler scale estimation based on an embedded repetition structure while a cross-correlation method is available with the knowledge of the waveform. For each received ZP-OFDM block, the existence of null subcarriers allows for blind Doppler scale estimation. In addition, a pilot-aided method and a decision-aided method are applicable based on cross-correlation with templates constructed from symbols on pilot subcarriers only and from symbols on all subcarriers after data decoding, respectively. This paper carries out extensive comparisons among these methods using both simulated and real experimental data. Further, the applicabilities of these methods to distributed multiuser systems are investigated.