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Underwater OFDM systems
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In this paper, we propose a method that uses the non-uniform Fast Fourier Transform (FFT) to compensate for Doppler frequency shifts in orthogonal frequency division multiplexing (OFDM) based underwater acoustic (UWA) communication systems. To estimate the Doppler frequency shift, the paper proposes using a pilot carrier frequency (PCF) that is identified by transmitting with greater power in the frequency domain compared to other subcarriers.
7p
vijeff
30-11-2023
3
3
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An image transmission underwater communications system has been researched and developed during the past years due to its potential applications in life, military, oil exploitation, and transportation. In this brief report, a study on the effect of the modulation method on the image communication through the underwater acoustic channel was performed.
9p
vifriedrich
06-09-2023
6
4
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In this paper, we propose a reliable communication solution using space-time diversity technique but using only one transceiver antenna applied to mobile OFDM system in underwater communication environment. In our solution, instead of using multiple receive antennas, the transmitter transmits an OFDM signal N times consecutively.
9p
vispyker
14-11-2022
10
4
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This paper investigates the impacts of InterChannel Interference (ICI) effects on a shallow underwater acoustic (UWA) orthogonal frequency-division multiplexing (OFDM) communication system. Considering both the turbulence of the water surface and the roughness of the bottom, a stochastic geometry-based channel model utilized for a wideband transmission scenario has been exploited to derive a simulation model. Since the system bandwidth and the subcarrier spacing is very limited in the range of a few kHz, the channel capacity of a UWA system is severely suffered by the ICI effect.
8p
nguaconbaynhay11
16-04-2021
17
4
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In this paper, we propose a new decoder method at the receiver of system to compensate Doppler frequency shift for OFDM-based underwater acoustic communication systems. At the transmitter, in order to save bandwidth, we do not use additional signal header (preamble) in each OFDM frame as proposed in many conventional approaches.
6p
vishizuka2711
07-04-2020
14
3
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