During any natural disaster‚ winds can harm any communication systems‚ especially a storm like Hurricane Katrina. Most of modern day communication tools rely on obstacles that are built on land‚ such as radio antennas and cellphone towers. Katrina’s fast winds knocked down a 400 foot antenna that was built to last through winds that would blow up to 150 mile-per-hour. Weakening communication for all citizens in New Orleans. “A majority of the public-safety systems serving police and fire departments
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greater than is necessary for other modes‚ particularly voice communications. The carrier is used in the transmitter to heterodyne (mix) with the audio to convert the audio to radio frequencies (the sidebands)‚ so that they can be radiated from an antenna. The carrier is transmitted along with the sidebands. The advantage of this is that the carrier is available to the receiver to once again heterodyne with the sidebands‚ this time to convert the sidebands back to the original audio frequencies
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Large Scale Fading and Channel modeling Using Matlab March 2012 Large scale fading and channel modeling Using Matlab Introduction The fading phenomenon can be broadly classified into two different types: large-scale fading and small-scale fading. Large-scale fading occurs as the mobile moves through a large distance‚ for example‚ a distance of the order of cell size . It is caused by path loss of signal as a function of distance and shadowing by large objects such as
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References: [1] G. J. Foschini And M. J. Gans‚ “On Limits of Wireless Communications in a Fading Environment When Using Multiple Antennas‚” Wireless Pers. Commun.‚ vol. 6‚ no. 3‚ Mar. 1998‚ pp. [4] M. Engels‚ Wireless OFDM Systems: How To Make Them Work?‚ Kluwer Academic Publishers‚ 2002. Mag.‚ vol. 40‚ no. 4‚ Apr. 2002‚ pp. 96–103. [8] G. D. Golden et al.‚ “Detection Algorithms and
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types and the IEEE 802.11 standards ■ Determine wireless networks within a broadcast radius and use the command line to gather network information ■ Configure a wireless router for operation ■ Plan a wireless infrastructure using appropriate antennas and channel selection Lab 6.1: Wireless Broadcast Domains Approximate Lab Time: 15–20 min. Materials Needed: paper/pencil‚ Textbook‚ and Internet research This lab reviews the basic IEEE 802.11 family of standards for radio frequency
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Chloroplasts and Photosynthesis All animals and most microorganisms rely on the continual uptake of large amounts of organic compounds from their environment. These compounds are used to provide both the carbon skeletons for biosynthesis and the metabolic energy that drives cellular processes. It is believed that the first organisms on the primitive Earth had access to an abundance of the organic compounds produced by geochemical processes‚ but that most of these original compounds were used up billions
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Ushahidi ’s rugged BRCK‚ ’the backup generator for the internet ’ Author: Ian Steadman Date of publication 13th May 2013 Reference: http://www.wired.co.uk/news/archive/2013-05/13/brck SUMMARY OF ARTICLE "Ushahidi"‚ which means "testimony" in Swahili‚ was a website that was initially developed to map reports of violence in Kenya after the post-election fallout at the beginning of 2008. Since then‚ the name "Ushahidi" has come to represent the people behind the;"Ushahidi Platform" (Ushahidi
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Children‚ Cell Phones‚ and Possible Side Effects There are possible health risks that go along with allowing a child to use a cell phone. This subject has been debated for years. Many researchers and health care professionals have done studies and given their opinions about it. Although cell phone companies do not opening warn you when you purchase a cell phone‚ I take the advice of risk very seriously. Being a mom‚ I found the following information very helpful when deciding that a cell
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electromagnetic waves that lie in the range of 3 khz to 300 Ghz are used for the wireless communication between the two devices. The signal is modulated at the transmitter end and then the antenna converts this electrical signal into the radio waves and emits them. The medium in which they travel is space. The receiving antenna catches the waves at the receiving end and then the signal is demodulated and converted back to its original form. These waves are highly affected by the interference
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ABSTRACT This project focuses on the development of a web based attendance register system‚ called mobile student attendance monitor. This project is motivated due to the fact that the student’s attendance record is the most important element which can reflect their academic achievement in the institutions. Mostly‚ the attendance register is circulated in the lecture rooms by the lecturers. This is a very time consuming method and not ideal for a large number of students in a big lecture hall.
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