Performance Comparison of Doppler Scale Estimation Methods for Underwater Acoustic OFDM
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...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2012-01-01
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| Series: | Journal of Electrical and Computer Engineering |
| Online Access: | http://dx.doi.org/10.1155/2012/703243 |
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| Summary: | 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. |
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| ISSN: | 2090-0147 2090-0155 |