The Experts below are selected from a list of 94083 Experts worldwide ranked by ideXlab platform
Qixiang Pang - One of the best experts on this subject based on the ideXlab platform.
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Collision Reduction in Cognitive Wireless Local Area Network over Fibre
2015Co-Authors: Alireza Attar, Victor C M Leung, Qixiang PangAbstract:Abstract—Cognitive wireless Local Area Network over fiber (CWLANoF), which employs remote antenna units (RAUs) connected to a central cognitive access point through optical fibres, can provide a cost-effective and efficient architecture for devices to equally share the industrial, scientific, and medical band by taking advantage of cognitive radio capabilities. Based on the CWLANoF architecture, we propose two methods to reduce collisions among stations, with multiple independent channels operating at each RAU, and transmitter and receiver diversity through cooperation of adjacent RAUs. Multi-channel-operation method is enabled by wide-band optical fibres and diversity method is enabled by distributed RAUs in the CWLANoF architecture. Extensive simulations show substantial improvements in Transmission Control Protocol throughput and packet error rate reduction of constant-bit-rate traffic streams, especially under dynamic traffic conditions. Keywords- cognitive radio; radio over fibre; WLAN; diversity; capture effect I
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cognitive wireless Local Area Network over fibers architecture research issues and testbed implementation
IEEE Communications Magazine, 2012Co-Authors: Alireza Attar, Victor C M Leung, Qixiang PangAbstract:We introduce a novel architecture incorporating broadband radio over optical fiber and cognitive radio technologies into a unified Network platform named Cognitive Wireless Local Area Network over Fibers (CWLANoF). We first elaborate on the system architecture and more specifically on various topologies to integrate optical fibers and wireless devices in CWLANoF. The mixture of centralized processing capability as well as distributed sets of antennas in this system leads to a rich set of research issues that are presented in this article. Finally, we present a testbed architecture built on a software defined radio platform, along with its implementation and test plans.
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collision avoidance and mitigation in cognitive wireless Local Area Network over fibre
2009 First International Conference on Evolving Internet, 2009Co-Authors: Alizera Attar, Victor C M Leung, Qixiang PangAbstract:Cognitive wireless Local Area Network (WLAN) over fiber (CWLANoF), which employs remote antenna units (RAUs) connected to a central cognitive access point, can provide a cost-effective and efficient architecture for devices to equally share the industrial, scientific, and medical band by taking advantage of cognitive radio capabilities. Based on the CWLANoF architecture, we propose two methods to reduce collisions among WLAN stations, with multiple independent channels operating at each RAU, and transmission and reception diversity through cooperation of adjacent RAUs. We evaluate the proposed methods through Monte-Carlo simulations. Compared with a conventional WLAN Extended Service Set with two access points, the proposed methods achieve 10% gain on Transmission Control Protocol (TCP) throughput and 10~25% reduction on packet error rate of constant-bit-rate traffic streams for spatially uniform traffic. When the traffic is spatially non-uniform with hotspots arising at certain locations, the TCP throughput gain increases by up to 26%. The results show the potential of CWLANoF in coping with dynamic traffic that often occurs in the indoor wireless access.
Victor C M Leung - One of the best experts on this subject based on the ideXlab platform.
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Collision Reduction in Cognitive Wireless Local Area Network over Fibre
2015Co-Authors: Alireza Attar, Victor C M Leung, Qixiang PangAbstract:Abstract—Cognitive wireless Local Area Network over fiber (CWLANoF), which employs remote antenna units (RAUs) connected to a central cognitive access point through optical fibres, can provide a cost-effective and efficient architecture for devices to equally share the industrial, scientific, and medical band by taking advantage of cognitive radio capabilities. Based on the CWLANoF architecture, we propose two methods to reduce collisions among stations, with multiple independent channels operating at each RAU, and transmitter and receiver diversity through cooperation of adjacent RAUs. Multi-channel-operation method is enabled by wide-band optical fibres and diversity method is enabled by distributed RAUs in the CWLANoF architecture. Extensive simulations show substantial improvements in Transmission Control Protocol throughput and packet error rate reduction of constant-bit-rate traffic streams, especially under dynamic traffic conditions. Keywords- cognitive radio; radio over fibre; WLAN; diversity; capture effect I
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cognitive wireless Local Area Network over fibers architecture research issues and testbed implementation
IEEE Communications Magazine, 2012Co-Authors: Alireza Attar, Victor C M Leung, Qixiang PangAbstract:We introduce a novel architecture incorporating broadband radio over optical fiber and cognitive radio technologies into a unified Network platform named Cognitive Wireless Local Area Network over Fibers (CWLANoF). We first elaborate on the system architecture and more specifically on various topologies to integrate optical fibers and wireless devices in CWLANoF. The mixture of centralized processing capability as well as distributed sets of antennas in this system leads to a rich set of research issues that are presented in this article. Finally, we present a testbed architecture built on a software defined radio platform, along with its implementation and test plans.
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collision avoidance and mitigation in cognitive wireless Local Area Network over fibre
2009 First International Conference on Evolving Internet, 2009Co-Authors: Alizera Attar, Victor C M Leung, Qixiang PangAbstract:Cognitive wireless Local Area Network (WLAN) over fiber (CWLANoF), which employs remote antenna units (RAUs) connected to a central cognitive access point, can provide a cost-effective and efficient architecture for devices to equally share the industrial, scientific, and medical band by taking advantage of cognitive radio capabilities. Based on the CWLANoF architecture, we propose two methods to reduce collisions among WLAN stations, with multiple independent channels operating at each RAU, and transmission and reception diversity through cooperation of adjacent RAUs. We evaluate the proposed methods through Monte-Carlo simulations. Compared with a conventional WLAN Extended Service Set with two access points, the proposed methods achieve 10% gain on Transmission Control Protocol (TCP) throughput and 10~25% reduction on packet error rate of constant-bit-rate traffic streams for spatially uniform traffic. When the traffic is spatially non-uniform with hotspots arising at certain locations, the TCP throughput gain increases by up to 26%. The results show the potential of CWLANoF in coping with dynamic traffic that often occurs in the indoor wireless access.
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code phase shift keying a power and bandwidth efficient spread spectrum signaling technique for wireless Local Area Network applications
Canadian Conference on Electrical and Computer Engineering, 1997Co-Authors: Adrian Wong, Victor C M LeungAbstract:Code-phase-shift keying (CPSK) is a novel direct-sequence spread-spectrum (DS-SS) signaling system employing M different code phase shifts of a single pseudonoise (PN) code sequence for M-ary signaling. CPSK offers increasing thermal noise immunity as M increases, and totally mitigates the effect of carrier frequency tone interference. It maintains good performance in a Rician fading channel, and a RAKE receiver could be used to improve the performance in a Rayleigh fading channel. The improved power and bandwidth efficiency of CPSK makes it suitable for wireless Local Area Network applications.
Alireza Attar - One of the best experts on this subject based on the ideXlab platform.
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Collision Reduction in Cognitive Wireless Local Area Network over Fibre
2015Co-Authors: Alireza Attar, Victor C M Leung, Qixiang PangAbstract:Abstract—Cognitive wireless Local Area Network over fiber (CWLANoF), which employs remote antenna units (RAUs) connected to a central cognitive access point through optical fibres, can provide a cost-effective and efficient architecture for devices to equally share the industrial, scientific, and medical band by taking advantage of cognitive radio capabilities. Based on the CWLANoF architecture, we propose two methods to reduce collisions among stations, with multiple independent channels operating at each RAU, and transmitter and receiver diversity through cooperation of adjacent RAUs. Multi-channel-operation method is enabled by wide-band optical fibres and diversity method is enabled by distributed RAUs in the CWLANoF architecture. Extensive simulations show substantial improvements in Transmission Control Protocol throughput and packet error rate reduction of constant-bit-rate traffic streams, especially under dynamic traffic conditions. Keywords- cognitive radio; radio over fibre; WLAN; diversity; capture effect I
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cognitive wireless Local Area Network over fibers architecture research issues and testbed implementation
IEEE Communications Magazine, 2012Co-Authors: Alireza Attar, Victor C M Leung, Qixiang PangAbstract:We introduce a novel architecture incorporating broadband radio over optical fiber and cognitive radio technologies into a unified Network platform named Cognitive Wireless Local Area Network over Fibers (CWLANoF). We first elaborate on the system architecture and more specifically on various topologies to integrate optical fibers and wireless devices in CWLANoF. The mixture of centralized processing capability as well as distributed sets of antennas in this system leads to a rich set of research issues that are presented in this article. Finally, we present a testbed architecture built on a software defined radio platform, along with its implementation and test plans.
Zhengyu Lin - One of the best experts on this subject based on the ideXlab platform.
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a graph theory based energy routing algorithm in energy Local Area Network
IEEE Transactions on Industrial Informatics, 2017Co-Authors: Ruichi Wang, Zhongnan Qian, Zhengyu LinAbstract:The energy Internet concept has been considered as a new development stage of the smart grid, which aims to increase the energy transmission efficiency and optimize the energy dispatching in time and space. Energy router is a core device in the energy Internet and it connects all the devices together into a net structure and manages power flows among them. The research work presented in this paper described the energy router's structure and function expectations from the Network perspective, and improved the existing energy router design. Open shortest path first (OSPF) protocol and virtual circuit switching mode are referenced from the Internet in the energy Local Area Network (e-LAN) design. This paper proposed a design of an energy routing algorithm based on graph theory in an e-LAN. A lowest cost routing selection algorithm is designed according to the features of power transmission, and a source selection and routing design algorithm is proposed for very heavy load conditions. Both algorithms have been verified by case analyses.
W E Leland - One of the best experts on this subject based on the ideXlab platform.
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Local Area Network characteristics with implications for broadband Network congestion management
IEEE Journal on Selected Areas in Communications, 1991Co-Authors: H J Fowler, W E LelandAbstract:The authors examine the phenomenon of congestion to better understand the congestion management techniques that will be needed in high-speed, cell-based Networks. The first step of this study is to use high time-resolution Local Area Network (LAN) traffic data to explore the nature of LAN traffic variability. Then the data are used for a trace-driven simulation of a connectionless service that provides LAN interconnection. The simulation allows one to characterize what congestion might look like in a high-speed, cell-based Network. When realistic data are applied to simple models of LAN interconnection, it is observed that during periods, congestion persists and losses can be significant; congestion losses cannot be avoided by modest increases in buffer capacity; consequences of misengineering can be serious; and, fortunately, most congested periods are preceded by signs of impending danger. >
