William StallingsData and Computer Communications7th Edition



Frequency Domain Concepts

Signal usually made up of many frequencies

Components are sine waves

Can be shown (Fourier analysis) that any signal is made up of component sine waves

Can plot frequency domain functions

Spectrum & Bandwidth


.Spectrum
range of frequencies contained in signal
.Absolute bandwidth
width of spectrum
.Effective bandwidth
Often just band ....etc

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transmitter circuit and receiver circuit diagram for optical communication based counter. and documentation ....etc

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http://freespaceopticsfreespaceoptics/images/flightstrata_photo.jpg
Free space optical communications is a line-of-sight (LOS) technology that transmits a modulated beam of visible or infrared light through the atmosphere for broadband communications. In a manner similar to fiber optical communications, free space optics uses a light emitting diode (LED) or laser (light amplification by stimulated emission of radiation) point source for data transmission. However, in free space optics, an energy beam is collimated and transmitted t ....etc

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The hottest technology in personal computing is wireless networking, which allows users to share a high -speed Internet connection among multiple computers without being tethered to wires or wall jacks. Known as WI-FI, this wireless system is commonly used to connect computers in various rooms of a home, but it's also popping up in public houses like airports, hotel lobbies and coffee shops.

The Mobile Internet relies on a new set of standards, known as the Wireless Application Protocol (WAP). The existing technology will provide efficient a ....etc

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I am looking for william c y lee mobile cellular telecommunications slides ....etc

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The Robot control using the wireless communication and the serial communication



Executive Summary
The NASA Robotics Alliance Cadets Program is being designed to be implemented at a
very low start-up cost, and to make this goal obtainable, the program is being developed
using low to no cost components from already developed, well-tested and robust
engineering testbeds.
In this project we are trying to establish both wireless communication between the mob ....etc

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INTRODUCTION

With the rapid progress in telecommunications, more and more services are provided on the basis of broadband communications, such as video services and high-speed Internet. With worldwide fundamental construction of a backbone network based on optical fiber providing almost unlimited communications capability, the limited throughput of the subscriber loop becomes one of the most stringent bottlenecks.Compared to the capacity of the backbone network, which is measured by tens of ....etc

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Advantages of digital communication system over analog communication system
Communication systems
 The block diagram on the top shows the blocks common to all communication systems
Remember the components of a communications system:
 Input transducer: The device that converts a physical signal from source to an electrical, mechanical or electromagnetic signal more suitable for communicating
 Transmitter: The device that sends the transduced signal
 Transmission channel: The physical medium ....etc

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transmitter circuit diagram, receiver circuit diagram. and documentation. ....etc

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