Dale Green
Dale Green has a total of 7 co-authors. Here are the top co-authors by number of shared publications:
- Konstantinos Pelekanakis
NATO STO Centre for Maritime Research and Experimentation, La Spezia, Italy
2 shared publications - Stephane Blouin
Defence Research and Development Canada, Atlantic Research Centre, Dartmouth, NS, Canada
2 shared publications - Joao Alves
NATO STO Centre for Maritime Research and Experimentation, La Spezia, Italy
1 shared publication - Roberto Petroccia
NATO STO Centre for Maritime Research and Experimentation, La Spezia, Italy
1 shared publication - Sean Pecknold
Defence Research and Development Canada, Dartmouth, Nova Scotia, Canada
1 shared publication - Stefano Fioravanti
NATO Science and Technology Organization, Centre for Maritime Research and Experimentation, 19126, La Spezia, Italy
1 shared publication
Latest Publications
- 7 May 2021
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Oceanic Engineering
- Vol. 46 (4) , 1438-1449
Performance Analysis of Underwater Acoustic Communications in Barrow Strait
The Arctic Ocean and its various shallow passages are rapidly changing due to global warming. The development of a large-scale wireless network that collects and distributes oceanographic data remotely would be an extremely valuable asset to researchers. This concept, however, is completely dependent upon the ability to acoustically transmit digital information under water over long ranges, which is not currently available. In this work, we investigate the performance of four transceivers that are based on frequency-hopping binary frequency-shift keying and multilevel phase-shift keying (M-PSK) signaling in the 300 $-$ 400-Hz acoustic band. The transceivers use low-rate coding that provides bit rates from 1.8 to 13.3 b/s (bits per second). Their bit error rates are computed based on real data recorded in Barrow Strait (NU). During the 2019 experimental activities, the transmitter was towed by a supporting vessel at an average speed of 4 kn. The receiver, a vertical hydrophone array, was at distance between 14 and 33 km. Additionally, the received signals experienced extended multipath propagation and strong in-band impulsive interferences. For a single-hydrophone receiver, our postprocessing analysis shows reliable bit rates up to 6.7 b/s. When processing uses the array and performs multichannel decision feedback equalization (DFE), the maximum designed rate, i.e., 13.3 b/s, is confirmed. Further analysis reveals that the experimental links could support higher data rates. Our results demonstrate that 2-PSK signaling combined with single-channel DFE and 4-PSK signaling combined with multichannel DFE could reliably achieve 100 and 200 b/s, respectively.- 7 May 2021
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Oceanic Engineering
- Vol. 46 (4) , 1438-1449
Performance Analysis of Underwater Acoustic Communications in Barrow Strait
The Arctic Ocean and its various shallow passages are rapidly changing due to global warming. The development of a large-scale wireless network that collects and distributes oceanographic data remotely would be an extremely valuable asset to researchers. This concept, however, is completely dependent upon the ability to acoustically transmit digital information under water over long ranges, which is not currently available. In this work, we investigate the performance of four transceivers that are based on frequency-hopping binary frequency-shift keying and multilevel phase-shift keying (M-PSK) signaling in the 300 $-$ 400-Hz acoustic band. The transceivers use low-rate coding that provides bit rates from 1.8 to 13.3 b/s (bits per second). Their bit error rates are computed based on real data recorded in Barrow Strait (NU). During the 2019 experimental activities, the transmitter was towed by a supporting vessel at an average speed of 4 kn. The receiver, a vertical hydrophone array, was at distance between 14 and 33 km. Additionally, the received signals experienced extended multipath propagation and strong in-band impulsive interferences. For a single-hydrophone receiver, our postprocessing analysis shows reliable bit rates up to 6.7 b/s. When processing uses the array and performs multichannel decision feedback equalization (DFE), the maximum designed rate, i.e., 13.3 b/s, is confirmed. Further analysis reveals that the experimental links could support higher data rates. Our results demonstrate that 2-PSK signaling combined with single-channel DFE and 4-PSK signaling combined with multichannel DFE could reliably achieve 100 and 200 b/s, respectively.- 20 August 2019
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Oceanic Engineering
- Vol. 44 (4) , 850-864
A Simulation Study for Long-Range Underwater Acoustic Networks in the High North
In stark contrast to a typical underwater acoustic network (UAN) deployed in mid-latitudes, ice-covered environments make network deployment difficult and expensive. A limited number of nodes must cover ranges of hundreds of kilometers. We tackle the network design in three layers: engineering, physical, and networking. At the engineering layer, we investigate hardware and bandwidth limitations for real-world implementation. Based on the proposed bandwidth, we design a software modem equipped with three waveforms achieving 1.8, 21.4, and 96.2 b/s. The packet error rate performance is computed with a channel simulator that takes realistic environmental parameters. Our simulations show that ranges of more than 100 km can be achieved in two High North areas during summer months provided that the point-to-point links exploit the ducted sound propagation. However, during winter months, this performance may not be always possible and multiple hops may be needed to cover the same range. Finally, based on the outcomes of the physical layer, an adaptive cross-layer routing protocol, termed network-aware adaptive routing (NADIR), is simulated. Link quality, energy consumption, and topological data are used to select the best coded modulation scheme and relay node in the next transmission slot. Our results show that the use of an adaptive strategy offers higher packet delivery and lower energy consumption than a nonadaptive strategy.
- 20 August 2019
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Oceanic Engineering
- Vol. 44 (4) , 850-864
A Simulation Study for Long-Range Underwater Acoustic Networks in the High North
In stark contrast to a typical underwater acoustic network (UAN) deployed in mid-latitudes, ice-covered environments make network deployment difficult and expensive. A limited number of nodes must cover ranges of hundreds of kilometers. We tackle the network design in three layers: engineering, physical, and networking. At the engineering layer, we investigate hardware and bandwidth limitations for real-world implementation. Based on the proposed bandwidth, we design a software modem equipped with three waveforms achieving 1.8, 21.4, and 96.2 b/s. The packet error rate performance is computed with a channel simulator that takes realistic environmental parameters. Our simulations show that ranges of more than 100 km can be achieved in two High North areas during summer months provided that the point-to-point links exploit the ducted sound propagation. However, during winter months, this performance may not be always possible and multiple hops may be needed to cover the same range. Finally, based on the outcomes of the physical layer, an adaptive cross-layer routing protocol, termed network-aware adaptive routing (NADIR), is simulated. Link quality, energy consumption, and topological data are used to select the best coded modulation scheme and relay node in the next transmission slot. Our results show that the use of an adaptive strategy offers higher packet delivery and lower energy consumption than a nonadaptive strategy.