Fresnel Domain Sector Modulation LFM Signal for Underwater Integrated Communication and Detection

The Internet of Underwater Things (IoUT) technology has been gaining importance in smart ocean investigation in recent years. The integrated system for underwater detection and communication (ISUDC) is considered a crucial technique for IoUT due to its potential to decrease equipment size and power...

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Bibliographic Details
Published inIEEE internet of things journal p. 1
Main Authors Bao, Jixin, Wang, Junlong, Tao, Quan, Han, Guangyao, Fu, Xiaomei
Format Journal Article
LanguageEnglish
Published IEEE 10.10.2024
Subjects
Channel impulse response
Chirp modulation
Complexity theory
Frequency shift keying
Frequency-domain analysis
Fresnel domain
Internet of Things
Internet of Underwater Things
OFDM
Receivers
Robustness
Time-domain analysis
Underwater acoustic detection and communication
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Summary:The Internet of Underwater Things (IoUT) technology has been gaining importance in smart ocean investigation in recent years. The integrated system for underwater detection and communication (ISUDC) is considered a crucial technique for IoUT due to its potential to decrease equipment size and power consumption. The linear frequency modulation (LFM) signal has the characteristics of large time-bandwidth product and has great advantages in detection. However, it has high-complexity and low robustness of communication in ISUDC. To address this issue, this paper proposes a sector-modulated linear frequency modulation (SM-LFM) signal for ISUDC. In terms of communication, it divides Fresnel domain into equal length sectors. Then, data is loaded by activating different sector. At the communication receiver, by establishing a relationship between the Dirac function in the Fresnel domain and the channel impulse response (CIR) in the time domain, data is demodulated by finding CIR's main path without channel estimation or equalization. In terms of detection, SM-LFM has an improvement in the maximum unambiguous velocity by calculating relative radial velocity in the Fresnel domain instead of the frequency domain. Numerical simulations and lake experiments have confirmed that the SM-LFM signal can deliver superior robustness and easy-to-use advantages for underwater active detection and communication.
ISSN:2327-4662
2327-4662
DOI:10.1109/JIOT.2024.3477576