Full-Duplex UAC Receiver With Two-Sensor Transducer

Henson, Benjamin; Shen, Lu; Zakharov, Yuriy

doi:10.1109/tcsii.2022.3199030

Cited by 3 publications

(7 citation statements)

References 18 publications

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“…The lake experiments were conducted using the recently developed two-sensor FD transducer (see Fig. 6) which contains two piezo-ceramic cylinders, one of them is used as a projector and the other one is used as a hydrophone [8].…”

Section: Lake Experimentsmentioning

confidence: 99%

“…However, even without using an antenna array, in an FD system, typically the transmitting and receiving transducers are two separate devices. In [8], we proposed an FD transducer that can be used for simultaneous transmission and reception of acoustic signals. We use this transducer in our UWA FD experiments.…”

Section: Introductionmentioning

confidence: 99%

“…To evaluate the performance of the FD UWA system, both half-duplex and FD communication experiments are conducted using recently developed FD transducers [8] in lake experi-Fig. 1: Block diagram of the FD UWA system.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Filtering for Full-Duplex UWA Systems With Time-Varying Self-Interference Channel

et al. 2020

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To enable full-duplex (FD) in underwater acoustic (UWA) systems, a high level of selfinterference (SI) cancellation (SIC) is required. This can be achieved by using a combination of SIC methods, including digital SIC. For digital SIC, adaptive filters are used. In time-invariant channels, the SI can be effectively cancelled by classical recursive least-square (RLS) adaptive filters, such as the slidingwindow RLS (SRLS) or exponential-window RLS, but their SIC performance degrades in time-varying channels, e.g., in channels with a moving sea surface. Their performance can be improved by delaying the filter inputs. This delay, however, makes the mean squared error (MSE) unsuitable for measuring the SIC performance. In this paper, we propose a new evaluation metric, the SIC factor (SICF), which gives better indication of the SIC performance compared to MSE. The SICF can be used to evaluate the performance of digital SIC techniques without the need of implementing a full FD system. A new SRLS adaptive filter based on parabolic approximation of the channel variation in time, named SRLS-P, is also proposed. The SIC performance of the SRLS-P adaptive filter and classical RLS algorithms (with and without the delay) is evaluated by simulation and in lake experiments. The results show that the SRLS-P adaptive filter can significantly improve the SIC performance, compared to the classical RLS adaptive filters. INDEX TERMS Adaptive filter, full-duplex, self-interference cancellation, time-varying channel estimation, underwater acoustic communications

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Section: Lake Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adaptive Filtering for Full-Duplex UWA Systems With Time-Varying Self-Interference Channel

et al. 2020

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“…In-band full-duplex (FD) communication [1] enables simultaneous transmission and reception of acoustic signals between two underwater nodes. For example, this can be achieved by equipping each node with a two-element transducer [2], and performing self-interference cancellation (SIC), i.e. cancellation of the transmitted signal at the hydrophone.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we investigate the impact of FD capability on the performance of ALOHA and Spatial reuse TDMA (STDMA) protocols, and in particular evaluate the impact of residual selfinterference (RSI) on the performance of these protocols, which to our knowledge has not been considered in the FD UAN protocol literature. The RSI was modelled based on the results of deploying a hardware prototype of a twoelement FD transducer [2] in lake experiments.…”

Section: Introductionmentioning

confidence: 99%

Full-Duplex Underwater Acoustic Networking: The Impact of Residual Self-Interference on the MAC Layer Performance

Morozs,

Shen,

Henson

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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In-band full-duplex (FD) communication enables simultaneous transmission and reception of acoustic signals between two underwater nodes. This can be achieved by performing self-interference cancellation (SIC) at the physical (PHY) layer. In this paper, we investigate the benefits of FD in underwater acoustic networks (UANs), in particular, focusing on the Medium Access Control (MAC) layer. In practice, SIC produces residual selfinterference (RSI) which reduces the received signal quality. We evaluate the performance of ALOHA and Spatial TDMA (STDMA) MAC protocols at a range of practical RSI levels observed in previous lake experiments. Simulation studies show that RSI has a negative impact on the throughput and packet loss in small UANs; however, this performance degradation is typically negligible in larger networks. Comparing the performance of FD-STDMA networks with equivalent half-duplex networks shows that there are specific network geometries where FD can substantially enhance the throughput -by up to 100%; however, in most simulated topologies the throughput gain of FD is small. Further work is required to jointly optimise the PHY and MAC layers and produce topology-specific solutions to extract bigger performance gains from FD.

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High-frequency plane piezoelectric transducer for high-sensitivity acoustics

Tian-liang

Yang

Wang

et al. 2023

IEICE Electron. Express

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With the continuous deepening of ocean exploration and the growth of emergency rescue needs, the hydroacoustic transducer, as an important component of sonar, has become more and more demanding. To improve the reception performance of the piezoelectric transducer, we developed a high-frequency, high-sensitivity planar piezoelectric transducer. A variant 1-3-2 type piezoelectric material is used to improve the effective electromechanical coupling coefficient, the upper surface of the material is covered with a brass plate to amplify the reception stress, and two variant 1-3-2 type piezoelectric materials with different dimensional parameters are arranged vertically to expand the bandwidth. We investigated the material properties and determined the material dimensions actually used to fabricate a planar hydroacoustic transducer utilizing electromechanical equivalent circuit analysis methods and finite element simulations. A prototype planar hydroacoustic transducer was fabricated and tested for resonant frequency, receiver sensitivity, bandwidth, and horizontal directivity then. The results show that the transducer's resonant frequency is about 218.7 kHz, the maximum receiving sensitivity is -178.7 dB, the 3 dB loss receiving bandwidth is about 45 kHz, and the horizontal directivity is about 17°. The test results all indicate that the developed hydroacoustic transducer has great potential for application in marine exploration and underwater emergency rescue.

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Full-Duplex UAC Receiver With Two-Sensor Transducer

Cited by 3 publications

References 18 publications

Adaptive Filtering for Full-Duplex UWA Systems With Time-Varying Self-Interference Channel

Adaptive Filtering for Full-Duplex UWA Systems With Time-Varying Self-Interference Channel

Full-Duplex Underwater Acoustic Networking: The Impact of Residual Self-Interference on the MAC Layer Performance

High-frequency plane piezoelectric transducer for high-sensitivity acoustics

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