ZoomFFT-Based Demodulation Algorithm for Underwater Acoustic OFDM Signals

Authors

Qing Guo, 1.School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China;2.Guangxi Key Laboratory of Automatic Detection Technology and Instruments, Guilin 541004, China;Follow
Angdi Li, 1.School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China;
Jing Wu, 1.School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China;
Haitao Su, 1.School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China;2.Guangxi Key Laboratory of Automatic Detection Technology and Instruments, Guilin 541004, China;

Abstract

Abstract: The picket fence effect of fast Fourier transform (FFT) restricts the demodulation performance of the underwater acoustic(UWA) communication systemusing orthogonal frequency division multiplexing (OFDM). To solve this problem, we propose a demodulation algorithm based on ZoomFFT. Specifically, the received signal is processed by frequency shifting and downsampling forarefined spectrum, which improves the spectralresolution and weakens the picketfence effect.Meanwhile, the channel response is refined, and the channel equalization algorithm is constructed on the basis of the minimum mean square error (MMSE) principle to eliminate the channel influence. Simulations show that the performance of underwater acoustic OFDM demodulation algorithm based on ZoomFFT is better than that of traditional FFT, and the algorithm complexity is low. Increasing the downsampling coefficient can further enhance the algorithm performance. The proposed algorithm can meet the requirements of low complexity and high performance of a UWA communication system.

Recommended Citation

Guo, Qing; Li, Angdi; Wu, Jing; and Su, Haitao (2022) "ZoomFFT-Based Demodulation Algorithm for Underwater Acoustic OFDM Signals," Journal of System Simulation: Vol. 34: Iss. 2, Article 14.
DOI: 10.16182/j.issn1004731x.joss.20-0714
Available at: https://dc-china-simulation.researchcommons.org/journal/vol34/iss2/14

First Page

314

Revised Date

2021-02-05

DOI Link

https://doi.org/10.16182/j.issn1004731x.joss.20-0714

Last Page

322

CLC

TN971.+1

Recommended Citation

Qing Guo, Angdi Li, Jing Wu, Haitao Su. ZoomFFT-Based Demodulation Algorithm for Underwater Acoustic OFDM Signals[J]. Journal of System Simulation, 2022, 34(2): 314-322.

Corresponding Author

Haitao Su,

DOI

10.16182/j.issn1004731x.joss.20-0714