Single Carrier with Frequency Domain Equalization for Synthetic Aperture Underwater Acoustic Communications

He, Chengbing; Xi, Rui; Wang, Han; Jing, Lianyou; Shi, Wentao; Zhang, Qunfei

doi:10.3390/s17071584

Cited by 9 publications

(3 citation statements)

References 26 publications

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“…In UWASNs, the reliability of communications is challenging because of the intersymbol interference (ISI) which could span tens or even hundreds of symbol durations [28]. Therefore, several communication techniques have been proposed, including single carrier with time-domain decision feedback equalizer (SC-TDE), orthogonal frequency-division multiplexing (OFDM), and single-carrier with frequency domain equalization (SC-FDE) [29]. The SC-FDE, in particular, is a promising low-complexity approach to mitigate the ISI by coping with long delay spread channels with single-tap equalizers.…”

Section: Receiver Computational Complexitymentioning

confidence: 99%

“…The SC-FDE receiver consists of a down-converter, a fast Fourier transform (FFT) module, a channel estimator, a frequency domain equalizer, and an inverse FFT (IFFT) module, as illustrated in Figure 2 of [29]. Especially, we focus on the FFT process where the intensity of digitized signals is obtained in the frequency domain.…”

Section: Receiver Computational Complexitymentioning

confidence: 99%

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A Study of Standardizing Frequencies Using Channel Raster for Underwater Wireless Acoustic Sensor Networks

Yun

Choi

2021

Sensors

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In this paper, we propose the method to standardize acoustic frequencies for underwater wireless acoustic sensor networks (UWASNs) by applying the channel raster used in the terrestrial mobile communications. The standardization process includes: (1) Setting the available acoustic frequency band where a channel raster is employed via the frequency specification analysis of the state-of-the art underwater acoustic communication modems. (2) Defining the center frequencies and the channel numbers as a function of channel raster, and the upper limit of the value of channel raster. (3) Determining the value of the channel raster suitable for the available acoustic frequency band via simulations. To set the value, three performance metrics are considered: the collision rate, the idle spectrum rate, and the receiver computational complexity. The simulation results show that the collision rate and the idle spectrum rate according to the value of channel raster have a trade-off relationship, but the influence of channel raster on the two performance metrics is insignificant. However, the receiver computational complexity is enhanced remarkably as the value of channel raster increases. Therefore, setting the value of channel raster close to its upper limit is the most adequate in respect of mitigating the occurrence of a collision and enhancing the reception performance. The standardized frequencies based on channel raster can guarantee the frequency compatibility required for the emerging technologies like the Internet of Underwater Things (IoUT) or the underwater cognitive radio, but also improves the network performance by avoiding the arbitrary use of frequencies.

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Section: Receiver Computational Complexitymentioning

confidence: 99%

Section: Receiver Computational Complexitymentioning

confidence: 99%

A Study of Standardizing Frequencies Using Channel Raster for Underwater Wireless Acoustic Sensor Networks

Yun

Choi

2021

Sensors

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“…In [31], authors presented the advantages of FDE with a single carrier (SC) for a multiple-input multipleoutput (MIMO) underwater communication system. In [32], authors investigated the performance of FDE and the hybrid time-frequency-domain equalizer (HTFDE) with SC for synthetic aperture underwater acoustic communications. In [13], authors investigated the optimal relay selection and power control in an OFDM-based cooperative communication.…”

mentioning

confidence: 99%

Single Carrier Frequency Domain Detectors for Internet of Underwater Things

Aljanabi¹,

Alluhaibi²,

Ahmed³

et al. 2022

Preprint

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This paper proposes low complexity detection for internet of underwater things (IoUT)s communication. The signal is transmitted from the source to the destination using several sensors. To simplify the computational operations at the transmitter and the sensory nodes, a single carrier frequency domain equalizer (SC-FDE) is proposed and amplify-and-forward (AF) protocols are employed. Fast Fourier transform (FFT) and use of cyclic prefix (CP) are also proposed to simplify these algorithms when compared to time-domain equalization. As precise channel data is difficult to capture in underwater communications, the adaptive implementation of FDE is proposed as a solution that can be employed when the channel experiences a fast doppler shift. The two adaptive detectors are based on the least mean-square (LMS) and recursive least square (RLS) principles. Numerical simulations show that the performance of the bit error rate (BER) performance of the proposed detectors is close to that of the ideal minimum mean square error (MMSE).

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Low Complexity Single Carrier Frequency Domain Detectors for Internet of Underwater Things (IoUT)s

Aljanabi

Alluhaibi

Ahmed

et al. 2022

Wireless Pers Commun

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This paper proposes low complexity detection for internet of underwater things communication. The signal is transmitted from the source to the destination using several sensors. To simplify the computational operations at the transmitter and the sensory nodes, a single carrier frequency domain equalizer is proposed and amplify-and-forward protocols are employed. Fast Fourier transform and use of cyclic prefix are also proposed to simplify these algorithms when compared to time-domain equalization. As precise channel data is difficult to capture in underwater communications, the adaptive implementation of FDE is proposed as a solution that can be employed when the channel experiences a fast doppler shift. The two adaptive detectors are based on the least mean-square and recursive least square principles. Numerical simulations show that the performance of the bit error rate performance of the proposed detectors is close to that of the ideal minimum mean square error.

show abstract

Single Carrier with Frequency Domain Equalization for Synthetic Aperture Underwater Acoustic Communications

Cited by 9 publications

References 26 publications

A Study of Standardizing Frequencies Using Channel Raster for Underwater Wireless Acoustic Sensor Networks

A Study of Standardizing Frequencies Using Channel Raster for Underwater Wireless Acoustic Sensor Networks

Single Carrier Frequency Domain Detectors for Internet of Underwater Things

Low Complexity Single Carrier Frequency Domain Detectors for Internet of Underwater Things (IoUT)s

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