Frequency-domain oversampling for zero-padded OFDM in underwater acoustic communications

Zhaohui Wang, Shengli Zhou, Georgios B. Giannakis, Christian R. Berger, Jie Huang

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


Although time-domain oversampling of the received baseband signal is common for single-carrier transmissions, the counterpart of frequency-domain oversampling is rarely used for multicarrier transmissions. This is because frequency-domain oversampling cannot be taken advantage of, when using the commonly used low-complexity receiver that assumes orthogonal subcarriers. In this paper, we explore frequency-domain oversampling to improve the system performance of zero-padded (ZP) orthogonal frequency division multiplexing (OFDM) transmissions over underwater acoustic channels with large Doppler spread. In these channels, intercarrier interference (ICI) has to be addressed explicitly via frequency-domain equalization, which enables inclusion of additional frequency samples at little increased complexity. We use a signal design that enables separate sparse channel estimation and data detection, reducing equalization complexity. Based on both simulation and experimental results, we observe that the receiver with frequency-domain oversampling outperforms the conventional one considerably, where the gain increases as the Doppler spread increases.

Original languageEnglish (US)
Article number6104194
Pages (from-to)14-24
Number of pages11
JournalIEEE Journal of Oceanic Engineering
Issue number1
StatePublished - Jan 2012

Bibliographical note

Funding Information:
Manuscript received June 10, 2010; revised July 08, 2011 and October 15, 2011; accepted October 21, 2011. Date of publication December 13, 2011; date of current version January 13, 2012. This work was supported by the U.S. Office of Naval Research (ONR) under grants N00014-07-1-0805 (YIP) and N00014-09-1-0704 (PECASE), and by the National Science Foundation (NSF) under Grant CNS-0721834. This paper was presented in part at the IEEE Global Telecommunications (GLOBECOM) Conference, Miami, FL, December 6–10, 2010. Associate Editor: U. Mitra.


  • Doppler spread
  • frequency-domain oversampling
  • intercarrier interference (ICI)
  • orthogonal frequency division multiplexing (OFDM)
  • zero padding (ZP)


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