E S S AY S E R I E S FALL 2010 The Future of Digital Communications: Technical Perspectives Edited by Fernando Laguarda Vice President‚ External Affairs and Policy Counselor Time Warner Cable www.twcresearchprogram.com For more information: Fernando Laguarda 901 F Street‚ NW Suite 800 Washington‚ DC 20004 Phone: (202) 370-4245 TABLE OF CONTENTS Introduction ......................................................................................................................
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Wireless network refers to any type of computer network that uses wireless (usually‚ but not always radio waves) for network connections. It is a method by which homes‚ telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building‚ or as a connection between various equipment locations.[1] Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place
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follows. The term can refer to the physical cabling that connects the nodes on a network the signal that is communicated over the path way or a sub channel is a carrier frequency. Ground waves: ground waves are radio wave which reaches a receiver from a transmitter directly with out reflection from the ionosphere. Sky waves: a radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth’s surface Line of propagation:
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which is part of two separate phone for listening and speaking has developed tools . 1878: The first telephone directory was published in the New Heaven . Guide to the subscriber’s name and number 21 was written . 1885: Now the transmitter and the receiver " receiver "
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wireless electricity. Wireless transmission is useful in cases where interconnecting wires are inconvenient‚ unaffordable‚ expensive‚ hazardous‚ unwanted or impossible. A large part of the energy sent out by the generating plant must arrive at the receiver to make the system economical. Some common forms of wireless electricity transmission methods are Direct Induction followed by resonant magnetic induction‚ electromagnetic radiation in the form of microwaves or lasers. With this technology we can
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signals. This scenario is very inefficient‚ since most of the signals generated by the human voice are small. Voice quality needs to focus on small signals. To solve this problem‚ adaptive DPCM is developed. 4. Linear Predictive Coding Linear Predictive Coding (LPC)‚ a powerful‚ good quality‚ low bit rate speech analysis technique for encoding a speech signal. The source filter model used in LPC is also known as the linear predictive coding model. It has two main components LPC analysis (encoding)
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the carrier frequency with spurious free dynamic range (SFDR) of more than 64 dB. 64 In this article also will have about the performance in FM. Also have an example for each demodulator and modulator for FM. it can be processed and used on the receiver end. II. FM Modulator Modulator In angle modulation‚ the amplitude of the signal is held constant and the phase is being varied with the message.An angle modulated signal is of the form xc(t) = Ac cos(Ωct + φ(t)).......... (1) The instantaneous
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Broadband Transport Specialist Module 01 - History of Fiber 1. What is the name of the type of architecture (or topology) used by SONet or 10 gigabit Ethernet (10gigE) networks? a. bus b. ring c. star d. hybrid e. mesh 2. The greater the density difference between two materials‚ the more a ray of light will ___. (Choose 2) a. attenuation less b. bend c. refract d. deflect e. absorb 3. What does LASER stand for? a
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tAbstract: Robotics 1. Obstacle Sense And Anti-Falling Robot. The objective is to design an intelligent and autonomous robot. This work is a small scale prototype model which can be used with great versatility in other robotics applications. This obstacles sensing and anti falling sensor robot senses the edges and obstacles. A set of infrared sensors avoid it falling from heights and Ultrasonic sensor is interfaced with controller so that when it senses obstacle it will send signals to the controller
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