The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Huang-chen Lee - One of the best experts on this subject based on the ideXlab platform.
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Demo Abstract: A LoRa Wireless Mesh Networking Module for Campus-Scale Monitoring
2017 16th ACM IEEE International Conference on Information Processing in Sensor Networks (IPSN), 2017Co-Authors: Q W Liang, J. H. Lin, G J Zeng, Huang-chen LeeAbstract:LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-Distance Transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure that indoor LoRa devices can transfer data back to remote servers. Mesh networking is a solution for increasing the communication range and packet delivery ratio without the need to install additional LoRa gateways. This study presents our design of a LoRa mesh-networking module for IoT applications (e.g.,collecting data from multiple, widely distributed sensors on a university campus). We deployed 19 LoRa mesh-networking devices distributed in an 800m by 600m area on campus to serve as a gateway and to collect data at one-minute intervals. The results show our LoRa mesh networking module achieved a 88.49% packet delivery ratio (PDR), while the LoRaWAN in star-network topology was only 58.7% under the same conditions.
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A LoRa wireless mesh networking module for campus-scale monitoring: demo abstract
Proceedings of the 16th …, 2017Co-Authors: Kai Hsiang Ke, J. H. Lin, Q W Liang, G J Zeng, Huang-chen LeeAbstract:LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-Distance Transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure that indoor LoRa devices can transfer data back to remote servers. Mesh networking is a solution for increasing the communication range and packet delivery ratio without the need to install additional LoRa gateways. This study presents our design of a LoRa mesh-networking module for IoT applications (e.g.,collecting data from multiple, widely distributed sensors on a university campus). We deployed 19 LoRa mesh-networking devices distributed in an 800m by 600m area on campus to serve as a gateway and to collect data at one-minute intervals. The results show our LoRa mesh networking module achieved a 88.49% packet delivery ratio (PDR), while the LoRaWAN in star-network topology was only 58.7% under the same conditions.
J P Gordon - One of the best experts on this subject based on the ideXlab platform.
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polarization multiplexing with solitons
Journal of Lightwave Technology, 1992Co-Authors: S G Evangelides, L F Mollenauer, J P Gordon, N S BerganoAbstract:It is shown both analytically and with numerical simulation, and confirmed experimentally in Transmission over Distances up to approximately 10000 km, that solitons maintain a high degree of polarization over an ultra-long Distance Transmission system consisting of birefringent dispersion-shifted fiber segments and erbium amplifiers. Based on that fact, the authors propose a polarization/time division multiplexing technique which should allow the single-wavelength bit-rate capacity of an ultra-long Distance soliton Transmission system to be doubled with little or no significant increase in bit error rate. >
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wavelength division multiplexing with solitons in ultra long Distance Transmission using lumped amplifiers
Journal of Lightwave Technology, 1991Co-Authors: L F Mollenauer, S G Evangelides, J P GordonAbstract:One attractive feature of the all-optical approach to ultra long-Distance Transmission is that it greatly facilitates wavelength division multiplexing (WDM). It is known that solitons of different velocities are transparent to each other. It is shown, through numerical simulation, that such transparency is also maintained in a system using lumped amplifiers, as long as the length of the collision (the Distance the solitons travel down the fiber while passing through each other), is long enough relative to the spacing between amplifiers, or to a possibly longer period of variation in some other parameter, such as the fiber's chromatic dispersion. This result implies the potential for at least several multigigabits-per-second WDM channels spanning just 1 or 2 nm, in a system of transoceanic length (7000-9000 km). >
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effects of fiber nonlinearities and amplifier spacing on ultra long Distance Transmission
Journal of Lightwave Technology, 1991Co-Authors: J P Gordon, L F MollenauerAbstract:It is shown that it should be possible to send error-free signals at a 2.5-Gb rate (or higher) over Distances of at least 9000 km using an amplitude shift keying (ASK) soliton modulation system. To accomplish this, the amplifiers must be kept close enough that their power gain is less than 10 dB. (It is noted that timing jitter and other noise effects measured in recent soliton Transmission experiments carried out at low D and with amplifier spacing of 25 km are in close accord with predictions of this work). Frequency division multiplexing of several channels over the same fiber should also be possible, as solitons of different frequencies interact very weakly, provided the Distance over which they pass through one another is large compared to the amplifier spacing. >
L F Mollenauer - One of the best experts on this subject based on the ideXlab platform.
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polarization multiplexing with solitons
Journal of Lightwave Technology, 1992Co-Authors: S G Evangelides, L F Mollenauer, J P Gordon, N S BerganoAbstract:It is shown both analytically and with numerical simulation, and confirmed experimentally in Transmission over Distances up to approximately 10000 km, that solitons maintain a high degree of polarization over an ultra-long Distance Transmission system consisting of birefringent dispersion-shifted fiber segments and erbium amplifiers. Based on that fact, the authors propose a polarization/time division multiplexing technique which should allow the single-wavelength bit-rate capacity of an ultra-long Distance soliton Transmission system to be doubled with little or no significant increase in bit error rate. >
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wavelength division multiplexing with solitons in ultra long Distance Transmission using lumped amplifiers
Journal of Lightwave Technology, 1991Co-Authors: L F Mollenauer, S G Evangelides, J P GordonAbstract:One attractive feature of the all-optical approach to ultra long-Distance Transmission is that it greatly facilitates wavelength division multiplexing (WDM). It is known that solitons of different velocities are transparent to each other. It is shown, through numerical simulation, that such transparency is also maintained in a system using lumped amplifiers, as long as the length of the collision (the Distance the solitons travel down the fiber while passing through each other), is long enough relative to the spacing between amplifiers, or to a possibly longer period of variation in some other parameter, such as the fiber's chromatic dispersion. This result implies the potential for at least several multigigabits-per-second WDM channels spanning just 1 or 2 nm, in a system of transoceanic length (7000-9000 km). >
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effects of fiber nonlinearities and amplifier spacing on ultra long Distance Transmission
Journal of Lightwave Technology, 1991Co-Authors: J P Gordon, L F MollenauerAbstract:It is shown that it should be possible to send error-free signals at a 2.5-Gb rate (or higher) over Distances of at least 9000 km using an amplitude shift keying (ASK) soliton modulation system. To accomplish this, the amplifiers must be kept close enough that their power gain is less than 10 dB. (It is noted that timing jitter and other noise effects measured in recent soliton Transmission experiments carried out at low D and with amplifier spacing of 25 km are in close accord with predictions of this work). Frequency division multiplexing of several channels over the same fiber should also be possible, as solitons of different frequencies interact very weakly, provided the Distance over which they pass through one another is large compared to the amplifier spacing. >
Kai Hsiang Ke - One of the best experts on this subject based on the ideXlab platform.
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A LoRa wireless mesh networking module for campus-scale monitoring: demo abstract
Proceedings of the 16th …, 2017Co-Authors: Kai Hsiang Ke, J. H. Lin, Q W Liang, G J Zeng, Huang-chen LeeAbstract:LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-Distance Transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure that indoor LoRa devices can transfer data back to remote servers. Mesh networking is a solution for increasing the communication range and packet delivery ratio without the need to install additional LoRa gateways. This study presents our design of a LoRa mesh-networking module for IoT applications (e.g.,collecting data from multiple, widely distributed sensors on a university campus). We deployed 19 LoRa mesh-networking devices distributed in an 800m by 600m area on campus to serve as a gateway and to collect data at one-minute intervals. The results show our LoRa mesh networking module achieved a 88.49% packet delivery ratio (PDR), while the LoRaWAN in star-network topology was only 58.7% under the same conditions.
Q W Liang - One of the best experts on this subject based on the ideXlab platform.
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Demo Abstract: A LoRa Wireless Mesh Networking Module for Campus-Scale Monitoring
2017 16th ACM IEEE International Conference on Information Processing in Sensor Networks (IPSN), 2017Co-Authors: Q W Liang, J. H. Lin, G J Zeng, Huang-chen LeeAbstract:LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-Distance Transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure that indoor LoRa devices can transfer data back to remote servers. Mesh networking is a solution for increasing the communication range and packet delivery ratio without the need to install additional LoRa gateways. This study presents our design of a LoRa mesh-networking module for IoT applications (e.g.,collecting data from multiple, widely distributed sensors on a university campus). We deployed 19 LoRa mesh-networking devices distributed in an 800m by 600m area on campus to serve as a gateway and to collect data at one-minute intervals. The results show our LoRa mesh networking module achieved a 88.49% packet delivery ratio (PDR), while the LoRaWAN in star-network topology was only 58.7% under the same conditions.
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A LoRa wireless mesh networking module for campus-scale monitoring: demo abstract
Proceedings of the 16th …, 2017Co-Authors: Kai Hsiang Ke, J. H. Lin, Q W Liang, G J Zeng, Huang-chen LeeAbstract:LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-Distance Transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure that indoor LoRa devices can transfer data back to remote servers. Mesh networking is a solution for increasing the communication range and packet delivery ratio without the need to install additional LoRa gateways. This study presents our design of a LoRa mesh-networking module for IoT applications (e.g.,collecting data from multiple, widely distributed sensors on a university campus). We deployed 19 LoRa mesh-networking devices distributed in an 800m by 600m area on campus to serve as a gateway and to collect data at one-minute intervals. The results show our LoRa mesh networking module achieved a 88.49% packet delivery ratio (PDR), while the LoRaWAN in star-network topology was only 58.7% under the same conditions.