Doppler Compensation of Underwater Acoustic OFDM Based on Parallel Search in Time and Frequency Domain and FPGA Implementation

Wang, Jun; Xie, Zhe; Jiao, Junsheng

doi:10.1109/icct.2018.8599892

Cited by 2 publications

(2 citation statements)

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“…Resampling is proven to be an effective method to alleviate the Doppler effect 3,4,24 . This is a very demanding task, especially when high precision is required, and need to reduce complexity of resampling with keeping the same communication performance 25 .…”

Section: Related Workmentioning

confidence: 99%

“…23 Resampling is proven to be an effective method to alleviate the Doppler effect. 3,4,24 This is a very demanding task, especially when high precision is required, and need to reduce complexity of resampling with keeping the same communication performance. 25 Discrete signal resampling (sampling rate conversion) can usually be achieved through digital-to-analog conversion or interpolation, after that residual Doppler frequency offset compensation is also required.…”

Section: Related Workmentioning

confidence: 99%

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Doppler estimation based on linear interpolation for underwater acoustic communication

Wang

et al. 2022

Trans Emerging Tel Tech

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In this article, we develop a Doppler estimation approach based on linear interpolation for underwater acoustic (UWA) OFDM system. Linear interpolation is used to achieve the resampling of the received signal. By interpolating the sampled signal with different compensation factors at the receiving end, the repeating structure of the CP-OFDM symbol is used to maximize the correlation value at the fixed window to obtain the estimated value of the Doppler factor. The fixed window is determined based on the length of the cyclic prefix and the maximum path delay. In addition, we deduced the expression of the received discrete sequence to perform correlation operations after interpolation, which is the theoretical basis of our proposed algorithm. Moreover, in order to reduce the number of iterations, which means computational complexity in this algorithm, we recommend using the dichotomy to quickly find the maximum correlation value. Simulation proves that the proposed algorithm perform better than other CP-OFDM-based time-domain autocorrelation algorithms.

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Section: Related Workmentioning

confidence: 99%