摘要 :
Wireless optical communication (WOC) has been widely concerned by the industry due to its advantages of wide bandwidth, high transmission rate, better security, and no need of authorized spectrum. As the fifth generation communica...
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Wireless optical communication (WOC) has been widely concerned by the industry due to its advantages of wide bandwidth, high transmission rate, better security, and no need of authorized spectrum. As the fifth generation communication and beyond five generations the rapid development of communication system, and to give full play to the advantages of WOC, this paper reviews the relay technology under indoor wireless optical communications, outdoor wireless optical communications and underwater wireless optical communication, elaborates based on relay technology of the three methods of communication protocol, channel model and modulation method, combining with specific experimental analysis of its performance. Finally, main problems of relay WOC are pointed out and the potential solutions are also given.
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摘要 :
Wireless optical communication (WOC) has been widely concerned by the industry due to its advantages of wide bandwidth, high transmission rate, better security, and no need of authorized spectrum. As the fifth generation communica...
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Wireless optical communication (WOC) has been widely concerned by the industry due to its advantages of wide bandwidth, high transmission rate, better security, and no need of authorized spectrum. As the fifth generation communication and beyond five generations the rapid development of communication system, and to give full play to the advantages of WOC, this paper reviews the relay technology under indoor wireless optical communications, outdoor wireless optical communications and underwater wireless optical communication, elaborates based on relay technology of the three methods of communication protocol, channel model and modulation method, combining with specific experimental analysis of its performance. Finally, main problems of relay WOC are pointed out and the potential solutions are also given.
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摘要 :
Two high-speed optical wireless demonstrators were produced within the EU funded framework 7 OMEGA project. One of these operates at 1.25Gbit/s demonstrating high data rates, and the other offering ‘room scale’ coverage at 280 Mbi...
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Two high-speed optical wireless demonstrators were produced within the EU funded framework 7 OMEGA project. One of these operates at 1.25Gbit/s demonstrating high data rates, and the other offering ‘room scale’ coverage at 280 Mbits/s. Details of design, implementation and testing of each are reviewed, together with the challenges of such systems and future directions for work in this area.
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摘要 :
Two high-speed optical wireless demonstrators were produced within the EU funded framework 7 OMEGA project. One of these operates at 1.25Gbit/s demonstrating high data rates, and the other offering ‘room scale’ coverage at 280 Mbi...
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Two high-speed optical wireless demonstrators were produced within the EU funded framework 7 OMEGA project. One of these operates at 1.25Gbit/s demonstrating high data rates, and the other offering ‘room scale’ coverage at 280 Mbits/s. Details of design, implementation and testing of each are reviewed, together with the challenges of such systems and future directions for work in this area.
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Wireless measurements are critical to the deployment of advanced wireless systems such as WiFi, 4G LTE, and 5G. Detailed measurement data are required to map the level and quality of coverage for service level agreements (SLA), to...
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Wireless measurements are critical to the deployment of advanced wireless systems such as WiFi, 4G LTE, and 5G. Detailed measurement data are required to map the level and quality of coverage for service level agreements (SLA), to characterize interference prior to and after deployment, and to characterize and optimize handoff regions. These often-repetitive measurements are time consuming, labor intensive, and prone to human error, especially when performed repetitively. Traditional methods include pushing a cart or carrying a backpack and laptop for performing wireless measurements. This paper discusses the work we are doing to improve the wireless coverage measurement process through automation. For small to medium indoor venues we are experimenting with wheeled robotic platforms, and for large venues such as stadiums, we are experimenting with using UAV's (drones) for mapping wireless coverage. Robot and UAV based platforms provide superior localization and higher resolution and quality data than conventional manual methods.
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Recently there have been demonstrations of Gbit/s communications systems using infra-red optical wireless. There are also reports of much higher link data rate experiments, and simulated architectures that will operate at several ...
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Recently there have been demonstrations of Gbit/s communications systems using infra-red optical wireless. There are also reports of much higher link data rate experiments, and simulated architectures that will operate at several Gbit/s. In this paper we review the Gbit/s system that was fabricated at Oxford as part of a recent European Community funded project, as an example of the challenges that face high data rate optical wireless. Approaches to exceeding 1 Gbit/s are described, together with the limitations that they have. Several potential future directions are outlined.
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In this paper, the design of microstrip antenna for modern wireless communication is presented. The proposed antenna has a fairly good performance of impedance bandwidth at 2.40 GHz. The antenna is designed on size of 46 × 37 × 1....
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In this paper, the design of microstrip antenna for modern wireless communication is presented. The proposed antenna has a fairly good performance of impedance bandwidth at 2.40 GHz. The antenna is designed on size of 46 × 37 × 1.5 mm3 and fed with 50 Ω microstrip line. Satisfactory performance was obtained by using TLC 30 (TACONIC)substrate, allowing low cost production, Tightly controlled Dk, low Df, excellent dimentional stability and high flexural strength. It covers the frequency bands 1.37 and 2.40 GHz which includes GPS and WLAN. The proposed microstrip antenna for wireless communication, consists of two major combined radiating elements: a rectangular and triangular patch element. These two elements are interconnected by step and patch B1 elements. It is found that the effect on frequency band depends on the length of the partial ground, position of steps, length of the rectangle and height of triangle in order to obtain a better S11 value. The design antenna able to obtain power gain of 2.7 dBi. Results are obtained using CST Microwave studio.
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摘要 :
In this paper, the design of microstrip antenna for modern wireless communication is presented. The proposed antenna has a fairly good performance of impedance bandwidth at 2.40 GHz. The antenna is designed on size of 46 × 37 × 1....
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In this paper, the design of microstrip antenna for modern wireless communication is presented. The proposed antenna has a fairly good performance of impedance bandwidth at 2.40 GHz. The antenna is designed on size of 46 × 37 × 1.5 mm3 and fed with 50 Ω microstrip line. Satisfactory performance was obtained by using TLC 30 (TACONIC)substrate, allowing low cost production, Tightly controlled Dk, low Df, excellent dimentional stability and high flexural strength. It covers the frequency bands 1.37 and 2.40 GHz which includes GPS and WLAN. The proposed microstrip antenna for wireless communication, consists of two major combined radiating elements: a rectangular and triangular patch element. These two elements are interconnected by step and patch B1 elements. It is found that the effect on frequency band depends on the length of the partial ground, position of steps, length of the rectangle and height of triangle in order to obtain a better S11 value. The design antenna able to obtain power gain of 2.7 dBi. Results are obtained using CST Microwave studio.
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It takes time to insert and pull out the plug in the wired way to settle the key parameters to a weapon before firing. In order to shorten the setting time and communicate with multiple shells or missiles at one time, the wireless...
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It takes time to insert and pull out the plug in the wired way to settle the key parameters to a weapon before firing. In order to shorten the setting time and communicate with multiple shells or missiles at one time, the wireless setting system had been designed, which consisted of the wireless communication system and the wireless power system. The wireless communication system in which chip CC2530 was used had been designed on the basis of SimpliciTI. The wireless power system includes the transmitter module which uses chip bq500210 and the receiver module which uses chip bq51013A. The comprising and function of the system, the design of the hardware and software had been introduced. The experiments showed that the good capability of the wireless setting system could shorten the setting time compared to the wired setting ways.
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A wireless network (e.g. a mesh Wi-Fi network) covering most of the city is a key component in the development of a smart city. While such a network offers countless benefits, a key issue with city-wide wireless network is the hig...
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A wireless network (e.g. a mesh Wi-Fi network) covering most of the city is a key component in the development of a smart city. While such a network offers countless benefits, a key issue with city-wide wireless network is the high fixed costs associated with laying out the infrastructure, rolling out the services, making the bandwidth available, maintaining the services once the network is laid out. One key question is determining who will setup the network and who will fund it. Secondly, who will supply the bandwidth while broadband bandwidth is still in shortage in most cities? Lastly, who will pay for the supplied bandwidth? We believe involvement of the communities is important in building a city-wide wireless network. Indeed, many community and neighborhood wireless networks have been successful. Could the city inspire and assist the communities with building their community wireless networks, and then unite them for a city-wide wireless network? In this paper, we address the first question by presenting a model where municipality, communities and smart utility providers work together to create a platform, smart community wireless platform, for a community in the city where different sides work together toward achieving smart community objectives. We present the platform with its various dynamics and describe a research plan for analyzing if this platform could be part of a viable solution to building a city-wide wireless network.
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