The Experts below are selected from a list of 56259 Experts worldwide ranked by ideXlab platform
Josep Miquel Jornet - One of the best experts on this subject based on the ideXlab platform.
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a link layer synchronization and medium access control protocol for terahertz Band Communication networks
IEEE Transactions on Mobile Computing, 2021Co-Authors: Qing Xia, Zahed Hossain, Michael J Medley, Josep Miquel JornetAbstract:In this paper, a link-layer synchronization and medium access control (MAC) protocol for very-high-speed wireless Communication networks in the Terahertz (THz) Band is presented. The protocol relies on a receiver-initiated handshake to guarantee synchronization between transmitter and receiver. Two scenarios are considered, namely, a macroscale scenario, where nodes utilize rotating directional antennas to periodically sweep the space while overcoming the distance problem at THz frequencies, and a nanoscale scenario, where nano-devices require energy harvesting systems to operate. Both scenarios are implemented on a centralized and an ad-hoc network architecture. A carrier-based physical layer is considered for the macro-scenario, whereas the physical layer for the nano-scenario is based on a femtosecond-long pulse-based modulation scheme with packet interleaving. The performance of the proposed MAC protocol is analytically investigated in terms of delay, throughput and probability of successful packet delivery, and compared to that of an adapted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) with and without handshake. The results are validated by means of extensive simulations with ns -3, in which all the necessary THz elements have been implemented. The results show that the proposed protocol can maximize the successful packet delivery probability without compromising the achievable throughput in THz-Band Communication networks.
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TeraSim: An ns-3 Extension to Simulate Terahertz-Band Communication Networks
Software Impacts, 2019Co-Authors: Zahed Hossain, Qing Xia, Josep Miquel JornetAbstract:Abstract Terahertz (THz)-Band (0.1-10 THz) Communication is envisioned as a key wireless technology of the next decade, able to support up to multi-Terabit-per-second wireless links in 6G systems. Parallel with the design of THz devices, simulation tools are needed to expedite the development of Communication protocols tailored to THz paradigm. In this paper, TeraSim, an extension for ns-3 to simulate THz Communication networks, is presented. TeraSim defines and implements separate modules for the THz channel and the physical and link layers. It enables the design and testing of higher layers of the protocol stack without delving with the lower layers technologies.
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Expedited Neighbor Discovery in Directional Terahertz Communication Networks Enhanced by Antenna Side-Lobe Information
IEEE Transactions on Vehicular Technology, 2019Co-Authors: Qing Xia, Josep Miquel JornetAbstract:Terahertz (THz)-Band (0.1–10 THz) Communication is envisioned as a key wireless technology of the next decade, able to support wireless Terabit-per-second links in 6G systems. THz Communication exhibits an extremely large Bandwidth (tens to hundreds of GHz) at the cost of a very high path loss ( $>$ 100 dB for distances beyond a few meters). Therefore, highly directional antennas (DAs) are needed simultaneously in transmission and reception at all times to establish reliable Communication links. The application of highly DAs introduces new challenges in the neighbor discovery process. In this paper, a time-efficient neighbor discovery protocol for THz-Band Communication networks is proposed. The protocol expedites the neighbor discovery process by leveraging the full antenna radiation pattern to detect a series of effective signals and map them to the universal signal patterns, which indicate the potential direction of the signal source. A mathematical framework is developed to compare the neighbor discovery protocols with and without the antenna side-lobes information in free space. The X60 testbed is utilized to validate the proposed neighbor discovery protocol. Furthermore, a feasibility analysis of the proposed protocol inside a bounded space (e.g., a square room) is conducted. Numerical results are presented to illustrate the performance improvements achieved by the proposed protocol when compared to the traditional neighbor discovery protocols with only main-lobe information.
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a new cubesat design with reconfigurable multi Band radios for dynamic spectrum satellite Communication networks
Ad Hoc Networks, 2019Co-Authors: Ian F Akyildiz, Josep Miquel Jornet, Shuai NieAbstract:Abstract Small satellites, or CubeSats, are envisioned as a promising solution for future satellite Communication networks because of their low costs and short deployment cycle. Currently, CubeSats communicate at conventionally allocated satellite Communication frequencies. However, with the increase in the number of CubeSats, CubeSat-enabled Communication systems, and many new use cases, new spectrum Bands and a more efficient spectrum usage are needed. In this paper, a novel CubeSat design with reconfigurable multi-Band radios for Communication in dynamic frequencies is proposed.The multi-Band radio design is realized by two complementary approaches, namely, an electronics-based and a photonics-based approach. The multi-Band Communication covers a wide range from radio frequencies (2–30 GHz), millimeter wave (30–300 GHz), Terahertz Band (up to 10 THz), and optical frequencies (with typical Bands of 850 nm/350 THz, 1300 nm/230 THz, and 1550 nm/193 THz). A thorough link budget analysis is conducted to demonstrate the potential of the proposed multi-Band architecture for space information networks. Key parameters in the satellite constellation design are investigated to explore the feasibility of deployment at different altitudes in the exosphere orbit (500 km and above). A continuous global coverage is demonstrated to serve the Internet of Space Things, a new paradigm for next generation satellite Communication networks.
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terasim an ns 3 extension to simulate terahertz Band Communication networks
Nano Communication Networks, 2018Co-Authors: Zahed Hossain, Qing Xia, Josep Miquel JornetAbstract:Abstract In the quest of higher wireless data-rates, Terahertz (THz)-Band (0.1-10 THz) Communication is envisioned as a key wireless technology of the next decade. In parallel to the development of THz transceivers and antennas, simulation tools are needed to expedite the development of Communication and networking protocols tailored to this novel networking paradigm, at a fraction of the cost. The few simulation platforms developed to date for THz Communication networks do not capture the peculiarities of the THz channel or the capabilities of THz devices. In this paper, TeraSim, i.e., an open source network simulation platform for THz Communication networks is presented. TeraSim is built as an extension for ns-3, which is one of the most widely used teaching and education network simulation software. The simulator has been developed considering two major types of application scenarios, namely, nanoscale Communication networks (average transmission range usually below one meter) and macroscale Communication networks (distances larger than one meter). The simulator consists of a common channel module, separate physical and link layers for each scenario, and two assisting modules, namely, THz antenna module and energy harvesting module, originally designed for the macroscale and nanoscale scenario, respectively. The structure, relations and content of each module are presented in detail. Extensive simulation and test results are provided to validate the functionalities of the implemented modules. TeraSim is expected to enable the networking community to test THz networking protocols without having to delve into the channel and physical layers.
Ian F Akyildiz - One of the best experts on this subject based on the ideXlab platform.
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a new cubesat design with reconfigurable multi Band radios for dynamic spectrum satellite Communication networks
Ad Hoc Networks, 2019Co-Authors: Ian F Akyildiz, Josep Miquel Jornet, Shuai NieAbstract:Abstract Small satellites, or CubeSats, are envisioned as a promising solution for future satellite Communication networks because of their low costs and short deployment cycle. Currently, CubeSats communicate at conventionally allocated satellite Communication frequencies. However, with the increase in the number of CubeSats, CubeSat-enabled Communication systems, and many new use cases, new spectrum Bands and a more efficient spectrum usage are needed. In this paper, a novel CubeSat design with reconfigurable multi-Band radios for Communication in dynamic frequencies is proposed.The multi-Band radio design is realized by two complementary approaches, namely, an electronics-based and a photonics-based approach. The multi-Band Communication covers a wide range from radio frequencies (2–30 GHz), millimeter wave (30–300 GHz), Terahertz Band (up to 10 THz), and optical frequencies (with typical Bands of 850 nm/350 THz, 1300 nm/230 THz, and 1550 nm/193 THz). A thorough link budget analysis is conducted to demonstrate the potential of the proposed multi-Band architecture for space information networks. Key parameters in the satellite constellation design are investigated to explore the feasibility of deployment at different altitudes in the exosphere orbit (500 km and above). A continuous global coverage is demonstrated to serve the Internet of Space Things, a new paradigm for next generation satellite Communication networks.
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ultra massive mimo channel modeling for graphene enabled terahertz Band Communications
Vehicular Technology Conference, 2018Co-Authors: Chong Han, Josep Miquel Jornet, Ian F AkyildizAbstract:Terahertz (THz)-Band Communication (0.1-10 THz) is envisioned as a key wireless technology to satisfy the in- creasing demand for faster data-rates in beyond 5G systems, thanks to its ultra-broad Bandwidth. The very high path loss at THz frequencies and the limited transmission power of THz transceivers impose a major distance limitation for THz wireless Communications. To increase the Communication distance and the achievable data rates at THz-Band frequencies, the concept of Ultra-Massive MIMO (UM-MIMO) has been introduced, which integrates a very large number of nano-antennas (e.g., 1024) in very small footprints (e.g., 1 mm^2). In this paper, an end-to-end model for UM-MIMO Communication in the THz Band is developed, by accounting for the properties of graphene- based plasmonic nano-antenna arrays and the peculiarities of three- dimensional THz propagation. The developed model is utilized to investigate the performance of the UM- MIMO channel. In particular, the path gain, the array factor and the the wideBand capacity for both spatial multiplexing and beamforming regimes are analyzed. The results show that multi-Terabit-per-second links are feasible at distances of up to 20 m when utilizing 1024 × 1024 UM-MIMO systems at 0.3 THz and 1 THz.
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distance aware Bandwidth adaptive resource allocation for wireless systems in the terahertz Band
IEEE Transactions on Terahertz Science and Technology, 2016Co-Authors: Chong Han, Ian F AkyildizAbstract:Terahertz (0.06–10 THz) Band Communication is envisioned as a key technology to satisfy the increasing demand for ultrahigh-speed wireless links. In this paper, a distance-aware Bandwidth-adaptive resource allocation scheme is developed for THz Band Communication networks, which has the objective to improve the distance. The proposed scheme captures the unique channel peculiarities including the relationship between the distance and the Bandwidth, and strategically utilizes the spectrum to enable multiple ultrahigh-speed links. Based on the developed scheme, the subwindows of the THz spectrum, the modulations, and the transmit power are adaptively allocated, for both single-user and multiuser Communications. The numerical results show that the developed resource allocation scheme improves the distances and exploitation of the THz spectrum significantly. Specifically, 10 Gb/s can be supported at 4 m in the multipath channel, while 100 Gb/s is achieved up to 21 m in the line-of-sight transmission with the use of 20 dB gain antennas. Furthermore, in the multiuser network, 14 10 Gb/s links can be supported simultaneously in the multipath channel. With the use of 20 dB gain antennas, 13 100 Gb/s links can be supported at the same time. Moreover, the developed resource allocation scheme outperforms the existing millimeter-wave systems and the nonadaptive scheme. This paper achieves the design objective and contributes to enable multiple ultrahigh-speed links in the THz Band Communication network.
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multi ray channel modeling and wideBand characterization for wireless Communications in the terahertz Band
IEEE Transactions on Wireless Communications, 2015Co-Authors: Chong Han, Ozan A Bicen, Ian F AkyildizAbstract:Terahertz (0.06–10 THz) Band Communication is envisioned as a key technology for satisfying the increasing demand for ultra-high-speed wireless links. In this paper, first, a unified multi-ray channel model in the THz Band is developed based on ray tracing techniques, which incorporates the propagation models for the line-of-sight, reflected, scattered, and diffracted paths. The developed theoretical model is validated with the experimental measurements (0.06–1 THz) from the literature. Then, using the developed propagation models, an in-depth analysis on the THz channel characteristics is carried out. In particular, the distance-varying and frequency-selective nature of the Terahertz channel is analyzed. Moreover, the coherence Bandwidth and the significance of the delay spread are studied. Furthermore, the wideBand channel capacity using flat and water-filling power allocation strategies is characterized. Additionally, the temporal broadening effects of the Terahertz channel are studied. Finally, distance-adaptive and multi-carrier transmissions are suggested to best benefit from the unique relationship between distance and Bandwidth. The provided analysis lays out the foundation for reliable and efficient ultra-high-speed wireless Communications in the (0.06–10) THz Band.
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full length article terahertz Band next frontier for wireless Communications
Physical Communication, 2014Co-Authors: Ian F Akyildiz, Josep Miquel Jornet, Chong HanAbstract:This paper provides an in-depth view of Terahertz Band (0.1-10 THz) Communication, which is envisioned as a key technology to satisfy the increasing demand for higher speed wireless Communication. THz Band Communication will alleviate the spectrum scarcity and capacity limitations of current wireless systems, and enable new applications both in classical networking domains as well as in novel nanoscale Communication paradigms. In this paper, the device design and development challenges for THz Band are surveyed first. The limitations and possible solutions for high-speed transceiver architectures are highlighted. The challenges for the development of new ultra-broadBand antennas and very large antenna arrays are explained. When the devices are finally developed, then they need to communicate in the THz Band. There exist many novel Communication challenges such as propagation modeling, capacity analysis, modulation schemes, and other physical and link layer solutions, in the THz Band which can be seen as a new frontier in the Communication research. These challenges are treated in depth in this paper explaining the existing plethora of work and what still needs to be tackled.
Chong Han - One of the best experts on this subject based on the ideXlab platform.
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ultra massive mimo channel modeling for graphene enabled terahertz Band Communications
Vehicular Technology Conference, 2018Co-Authors: Chong Han, Josep Miquel Jornet, Ian F AkyildizAbstract:Terahertz (THz)-Band Communication (0.1-10 THz) is envisioned as a key wireless technology to satisfy the in- creasing demand for faster data-rates in beyond 5G systems, thanks to its ultra-broad Bandwidth. The very high path loss at THz frequencies and the limited transmission power of THz transceivers impose a major distance limitation for THz wireless Communications. To increase the Communication distance and the achievable data rates at THz-Band frequencies, the concept of Ultra-Massive MIMO (UM-MIMO) has been introduced, which integrates a very large number of nano-antennas (e.g., 1024) in very small footprints (e.g., 1 mm^2). In this paper, an end-to-end model for UM-MIMO Communication in the THz Band is developed, by accounting for the properties of graphene- based plasmonic nano-antenna arrays and the peculiarities of three- dimensional THz propagation. The developed model is utilized to investigate the performance of the UM- MIMO channel. In particular, the path gain, the array factor and the the wideBand capacity for both spatial multiplexing and beamforming regimes are analyzed. The results show that multi-Terabit-per-second links are feasible at distances of up to 20 m when utilizing 1024 × 1024 UM-MIMO systems at 0.3 THz and 1 THz.
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Stochastic geometry analysis of interference and coverage in Terahertz networks
Nano Communication Networks, 2017Co-Authors: Xin Wei Yao, Chao Chao Wang, Wan Liang Wang, Chong HanAbstract:Terahertz (THz) Band Communication has been envisioned as a key wireless technology for providing unprecedented high data rates. However, due to the severe path loss, the transmission distance in THz Band is very limited. Therefore, the beamforming techniques are explored to enlarge the Communication range in THz networks, particularly employed at Access Points (APs). Interference is a critical factor affecting the performance of THz networks. In this paper, the interference and the coverage probability are investigated for the THz Band Communications with beamforming APs. First, based on the Line-of-Sight (LoS) and Non-Line-of-Sight (NLoS) ray propagation models of THz signals, the interferences from neighboring users and beamforming APs are modeled in closed forms based on stochastic geometry methods. Then, the Signal-to-Interference-plus-Noise-Ratio (SINR) and the coverage probabilities are further derived based on the THz channel and interference model. Extensive simulations are carried out to evaluate the interference and coverage for the THz Band Communications with beamforming APs, for the different system parameters, which include SINR threshold, density of APs, transmission frequency, gain of beamforming AP, density of users and radius of interference area. Learning from the simulation results, high density of APs with a small beam-width and the transmission at THz frequencies with low absorption efficient, such as 0.67 THz, are recommended to mitigate the interference and achieve a better coverage performance.
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distance aware Bandwidth adaptive resource allocation for wireless systems in the terahertz Band
IEEE Transactions on Terahertz Science and Technology, 2016Co-Authors: Chong Han, Ian F AkyildizAbstract:Terahertz (0.06–10 THz) Band Communication is envisioned as a key technology to satisfy the increasing demand for ultrahigh-speed wireless links. In this paper, a distance-aware Bandwidth-adaptive resource allocation scheme is developed for THz Band Communication networks, which has the objective to improve the distance. The proposed scheme captures the unique channel peculiarities including the relationship between the distance and the Bandwidth, and strategically utilizes the spectrum to enable multiple ultrahigh-speed links. Based on the developed scheme, the subwindows of the THz spectrum, the modulations, and the transmit power are adaptively allocated, for both single-user and multiuser Communications. The numerical results show that the developed resource allocation scheme improves the distances and exploitation of the THz spectrum significantly. Specifically, 10 Gb/s can be supported at 4 m in the multipath channel, while 100 Gb/s is achieved up to 21 m in the line-of-sight transmission with the use of 20 dB gain antennas. Furthermore, in the multiuser network, 14 10 Gb/s links can be supported simultaneously in the multipath channel. With the use of 20 dB gain antennas, 13 100 Gb/s links can be supported at the same time. Moreover, the developed resource allocation scheme outperforms the existing millimeter-wave systems and the nonadaptive scheme. This paper achieves the design objective and contributes to enable multiple ultrahigh-speed links in the THz Band Communication network.
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multi ray channel modeling and wideBand characterization for wireless Communications in the terahertz Band
IEEE Transactions on Wireless Communications, 2015Co-Authors: Chong Han, Ozan A Bicen, Ian F AkyildizAbstract:Terahertz (0.06–10 THz) Band Communication is envisioned as a key technology for satisfying the increasing demand for ultra-high-speed wireless links. In this paper, first, a unified multi-ray channel model in the THz Band is developed based on ray tracing techniques, which incorporates the propagation models for the line-of-sight, reflected, scattered, and diffracted paths. The developed theoretical model is validated with the experimental measurements (0.06–1 THz) from the literature. Then, using the developed propagation models, an in-depth analysis on the THz channel characteristics is carried out. In particular, the distance-varying and frequency-selective nature of the Terahertz channel is analyzed. Moreover, the coherence Bandwidth and the significance of the delay spread are studied. Furthermore, the wideBand channel capacity using flat and water-filling power allocation strategies is characterized. Additionally, the temporal broadening effects of the Terahertz channel are studied. Finally, distance-adaptive and multi-carrier transmissions are suggested to best benefit from the unique relationship between distance and Bandwidth. The provided analysis lays out the foundation for reliable and efficient ultra-high-speed wireless Communications in the (0.06–10) THz Band.
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full length article terahertz Band next frontier for wireless Communications
Physical Communication, 2014Co-Authors: Ian F Akyildiz, Josep Miquel Jornet, Chong HanAbstract:This paper provides an in-depth view of Terahertz Band (0.1-10 THz) Communication, which is envisioned as a key technology to satisfy the increasing demand for higher speed wireless Communication. THz Band Communication will alleviate the spectrum scarcity and capacity limitations of current wireless systems, and enable new applications both in classical networking domains as well as in novel nanoscale Communication paradigms. In this paper, the device design and development challenges for THz Band are surveyed first. The limitations and possible solutions for high-speed transceiver architectures are highlighted. The challenges for the development of new ultra-broadBand antennas and very large antenna arrays are explained. When the devices are finally developed, then they need to communicate in the THz Band. There exist many novel Communication challenges such as propagation modeling, capacity analysis, modulation schemes, and other physical and link layer solutions, in the THz Band which can be seen as a new frontier in the Communication research. These challenges are treated in depth in this paper explaining the existing plethora of work and what still needs to be tackled.
Qing Xia - One of the best experts on this subject based on the ideXlab platform.
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a link layer synchronization and medium access control protocol for terahertz Band Communication networks
IEEE Transactions on Mobile Computing, 2021Co-Authors: Qing Xia, Zahed Hossain, Michael J Medley, Josep Miquel JornetAbstract:In this paper, a link-layer synchronization and medium access control (MAC) protocol for very-high-speed wireless Communication networks in the Terahertz (THz) Band is presented. The protocol relies on a receiver-initiated handshake to guarantee synchronization between transmitter and receiver. Two scenarios are considered, namely, a macroscale scenario, where nodes utilize rotating directional antennas to periodically sweep the space while overcoming the distance problem at THz frequencies, and a nanoscale scenario, where nano-devices require energy harvesting systems to operate. Both scenarios are implemented on a centralized and an ad-hoc network architecture. A carrier-based physical layer is considered for the macro-scenario, whereas the physical layer for the nano-scenario is based on a femtosecond-long pulse-based modulation scheme with packet interleaving. The performance of the proposed MAC protocol is analytically investigated in terms of delay, throughput and probability of successful packet delivery, and compared to that of an adapted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) with and without handshake. The results are validated by means of extensive simulations with ns -3, in which all the necessary THz elements have been implemented. The results show that the proposed protocol can maximize the successful packet delivery probability without compromising the achievable throughput in THz-Band Communication networks.
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TeraSim: An ns-3 Extension to Simulate Terahertz-Band Communication Networks
Software Impacts, 2019Co-Authors: Zahed Hossain, Qing Xia, Josep Miquel JornetAbstract:Abstract Terahertz (THz)-Band (0.1-10 THz) Communication is envisioned as a key wireless technology of the next decade, able to support up to multi-Terabit-per-second wireless links in 6G systems. Parallel with the design of THz devices, simulation tools are needed to expedite the development of Communication protocols tailored to THz paradigm. In this paper, TeraSim, an extension for ns-3 to simulate THz Communication networks, is presented. TeraSim defines and implements separate modules for the THz channel and the physical and link layers. It enables the design and testing of higher layers of the protocol stack without delving with the lower layers technologies.
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Expedited Neighbor Discovery in Directional Terahertz Communication Networks Enhanced by Antenna Side-Lobe Information
IEEE Transactions on Vehicular Technology, 2019Co-Authors: Qing Xia, Josep Miquel JornetAbstract:Terahertz (THz)-Band (0.1–10 THz) Communication is envisioned as a key wireless technology of the next decade, able to support wireless Terabit-per-second links in 6G systems. THz Communication exhibits an extremely large Bandwidth (tens to hundreds of GHz) at the cost of a very high path loss ( $>$ 100 dB for distances beyond a few meters). Therefore, highly directional antennas (DAs) are needed simultaneously in transmission and reception at all times to establish reliable Communication links. The application of highly DAs introduces new challenges in the neighbor discovery process. In this paper, a time-efficient neighbor discovery protocol for THz-Band Communication networks is proposed. The protocol expedites the neighbor discovery process by leveraging the full antenna radiation pattern to detect a series of effective signals and map them to the universal signal patterns, which indicate the potential direction of the signal source. A mathematical framework is developed to compare the neighbor discovery protocols with and without the antenna side-lobes information in free space. The X60 testbed is utilized to validate the proposed neighbor discovery protocol. Furthermore, a feasibility analysis of the proposed protocol inside a bounded space (e.g., a square room) is conducted. Numerical results are presented to illustrate the performance improvements achieved by the proposed protocol when compared to the traditional neighbor discovery protocols with only main-lobe information.
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terasim an ns 3 extension to simulate terahertz Band Communication networks
Nano Communication Networks, 2018Co-Authors: Zahed Hossain, Qing Xia, Josep Miquel JornetAbstract:Abstract In the quest of higher wireless data-rates, Terahertz (THz)-Band (0.1-10 THz) Communication is envisioned as a key wireless technology of the next decade. In parallel to the development of THz transceivers and antennas, simulation tools are needed to expedite the development of Communication and networking protocols tailored to this novel networking paradigm, at a fraction of the cost. The few simulation platforms developed to date for THz Communication networks do not capture the peculiarities of the THz channel or the capabilities of THz devices. In this paper, TeraSim, i.e., an open source network simulation platform for THz Communication networks is presented. TeraSim is built as an extension for ns-3, which is one of the most widely used teaching and education network simulation software. The simulator has been developed considering two major types of application scenarios, namely, nanoscale Communication networks (average transmission range usually below one meter) and macroscale Communication networks (distances larger than one meter). The simulator consists of a common channel module, separate physical and link layers for each scenario, and two assisting modules, namely, THz antenna module and energy harvesting module, originally designed for the macroscale and nanoscale scenario, respectively. The structure, relations and content of each module are presented in detail. Extensive simulation and test results are provided to validate the functionalities of the implemented modules. TeraSim is expected to enable the networking community to test THz networking protocols without having to delve into the channel and physical layers.
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a link layer synchronization and medium access control protocol for terahertz Band Communication networks
Global Communications Conference, 2014Co-Authors: Qing Xia, Zahed Hossain, Michael J Medley, Josep Miquel JornetAbstract:In this paper, a link-layer synchronization and medium access control (MAC) protocol for very-high-speed wireless Communication networks in the THz Band is presented. The protocol relies on a receiver-initiated handshake as a way to guarantee synchronization between transmitter and receiver. In addition, it incorporates a sliding window flow control mechanism, which combined with the one-way handshake, maximizes the channel utilization. Two different application scenarios are considered, namely, a macroscale scenario, in which nodes utilize turning directional antennas to periodically sweep the space while overcoming the distance problem at THz frequencies, and a nanoscale scenario, in which nano-nodes require energy harvesting systems to operate. A carrier-based physical layer is considered for the macro-scenario, whereas the physical layer for the nano-scenario is based on a femtosecond- long pulse-based modulation scheme with frame interleaving. The performance of the proposed MAC protocol is analytically investigated in terms of delay, throughput and successful packet transmission probability, and compared to that of an adapted Carrier Sense Multiple Access with Collision Avoidance with and without handshake. The results are validated by means of extensive simulations with ns-3, in which all the necessary THz elements have been implemented. The results show that the proposed protocol can maximize the successful packet delivery probability without compromising the achievable throughput in THz-Band Communication networks.
Zahed Hossain - One of the best experts on this subject based on the ideXlab platform.
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a link layer synchronization and medium access control protocol for terahertz Band Communication networks
IEEE Transactions on Mobile Computing, 2021Co-Authors: Qing Xia, Zahed Hossain, Michael J Medley, Josep Miquel JornetAbstract:In this paper, a link-layer synchronization and medium access control (MAC) protocol for very-high-speed wireless Communication networks in the Terahertz (THz) Band is presented. The protocol relies on a receiver-initiated handshake to guarantee synchronization between transmitter and receiver. Two scenarios are considered, namely, a macroscale scenario, where nodes utilize rotating directional antennas to periodically sweep the space while overcoming the distance problem at THz frequencies, and a nanoscale scenario, where nano-devices require energy harvesting systems to operate. Both scenarios are implemented on a centralized and an ad-hoc network architecture. A carrier-based physical layer is considered for the macro-scenario, whereas the physical layer for the nano-scenario is based on a femtosecond-long pulse-based modulation scheme with packet interleaving. The performance of the proposed MAC protocol is analytically investigated in terms of delay, throughput and probability of successful packet delivery, and compared to that of an adapted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) with and without handshake. The results are validated by means of extensive simulations with ns -3, in which all the necessary THz elements have been implemented. The results show that the proposed protocol can maximize the successful packet delivery probability without compromising the achievable throughput in THz-Band Communication networks.
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TeraSim: An ns-3 Extension to Simulate Terahertz-Band Communication Networks
Software Impacts, 2019Co-Authors: Zahed Hossain, Qing Xia, Josep Miquel JornetAbstract:Abstract Terahertz (THz)-Band (0.1-10 THz) Communication is envisioned as a key wireless technology of the next decade, able to support up to multi-Terabit-per-second wireless links in 6G systems. Parallel with the design of THz devices, simulation tools are needed to expedite the development of Communication protocols tailored to THz paradigm. In this paper, TeraSim, an extension for ns-3 to simulate THz Communication networks, is presented. TeraSim defines and implements separate modules for the THz channel and the physical and link layers. It enables the design and testing of higher layers of the protocol stack without delving with the lower layers technologies.
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terasim an ns 3 extension to simulate terahertz Band Communication networks
Nano Communication Networks, 2018Co-Authors: Zahed Hossain, Qing Xia, Josep Miquel JornetAbstract:Abstract In the quest of higher wireless data-rates, Terahertz (THz)-Band (0.1-10 THz) Communication is envisioned as a key wireless technology of the next decade. In parallel to the development of THz transceivers and antennas, simulation tools are needed to expedite the development of Communication and networking protocols tailored to this novel networking paradigm, at a fraction of the cost. The few simulation platforms developed to date for THz Communication networks do not capture the peculiarities of the THz channel or the capabilities of THz devices. In this paper, TeraSim, i.e., an open source network simulation platform for THz Communication networks is presented. TeraSim is built as an extension for ns-3, which is one of the most widely used teaching and education network simulation software. The simulator has been developed considering two major types of application scenarios, namely, nanoscale Communication networks (average transmission range usually below one meter) and macroscale Communication networks (distances larger than one meter). The simulator consists of a common channel module, separate physical and link layers for each scenario, and two assisting modules, namely, THz antenna module and energy harvesting module, originally designed for the macroscale and nanoscale scenario, respectively. The structure, relations and content of each module are presented in detail. Extensive simulation and test results are provided to validate the functionalities of the implemented modules. TeraSim is expected to enable the networking community to test THz networking protocols without having to delve into the channel and physical layers.
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stochastic multipath channel modeling and power delay profile analysis for terahertz Band Communication
International Conference on Nanoscale Computing and Communication, 2017Co-Authors: Zahed Hossain, Carley N Mollica, Josep Miquel JornetAbstract:Terahertz (THz) Band (0.1--10 THz) Communication is envisioned as a key technology to address the explosive growth in mobile data in recent years and the demand for high speed wireless Communications. Major recent advances in device technologies are finally closing the THz gap and, thus, bringing this networking paradigm closer to reality. A general channel model is essential in designing and simulating Communication techniques for the THz Band. In this paper, we develop a stochastic multipath channel model for THz Band Communication for bounded area applications. Specifically, an analytical model for the number of single bounce multi-path components and the power delay profile in a rectangular deployment scenario is derived, considering the density of obstacles, variable geometry of the rectangle, the signal blocking by obstacles and the propagation properties of THz signals. The model is independent of the physical layer technology and can be tailored to different application scenarios. Extensive simulation results are provided and utilized to validate the developed analytical model.
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stochastic multipath channel modeling and power delay profile analysis for terahertz Band Communication
International Conference on Nanoscale Computing and Communication, 2017Co-Authors: Zahed Hossain, Carley N Mollica, Josep Miquel JornetAbstract:Terahertz (THz) Band (0.1--10 THz) Communication is envisioned as a key technology to address the explosive growth in mobile data in recent years and the demand for high speed wireless Communications. Major recent advances in device technologies are finally closing the THz gap and, thus, bringing this networking paradigm closer to reality. A general channel model is essential in designing and simulating Communication techniques for the THz Band. In this paper, we develop a stochastic multipath channel model for THz Band Communication for bounded area applications. Specifically, an analytical model for the number of single bounce multi-path components and the power delay profile in a rectangular deployment scenario is derived, considering the density of obstacles, variable geometry of the rectangle, the signal blocking by obstacles and the propagation properties of THz signals. The model is independent of the physical layer technology and can be tailored to different application scenarios. Extensive simulation results are provided and utilized to validate the developed analytical model.
