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Wireless Technology Basics, Signals, Modulation Types, And Access Technologies

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Published by Althos .
Written in English


  • Telecommunications,
  • Technology & Industrial Arts,
  • Technology,
  • Science/Mathematics

Book details:

The Physical Object
Number of Pages52
ID Numbers
Open LibraryOL8811238M
ISBN 101932813039
ISBN 109781932813036

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Get this from a library! Wireless technology basics: signals, modulation types, and access technologies. [Lawrence Harte]. Wireless Technology Basics: Signals, Modulation Types, and Access Technologies Covering the fundamentals of wireless technology and terminology, this helpful text explains how the radio frequency spectrum is divided, the basics of radio frequency transmission and modulation, antennas and radio networks. Wireless Technology Basics. Dividing the Radio Frequency (RF) Spectrum. Licensing Frequency Allocation Charting RF Channels and Bandwidth. Radio Propagation. Signal Types. Analog Signals Digital Signals. Digitization of an Analog Signal. Modulation of the Radio Waves. Amplitude Modulation (AM) Frequency Modulation (FM) Phase Modulation (PM). Introduction to wireless Technology. 3 1 An introduction to the wireless systems and different technologies, applies to wireless ATM systems and is used in access hubs. 43 IEEE b - often called Wi-Fi - is backward compatible with The modulation used in.

Wireless communication technologies Signals Bandwidth limited signals Signal modulation Data transfer rate Signal propagation Most of the slides of this lecture come from prof. Jochen Schiller’s didactical material for the book “Mobile Communications”, Addison Wesley, Wireless Local-Area Networks: A brief history of wireless networking and some of the basic concepts. How Bandwidth Is Achieved from RF Signals: The frequency spectrum used in RF transmissions. Figure 1 shows a basic serial digital signal of binary zeros and ones to be transmitted and the corresponding AM and FM signals resulting from modulation. There are two types of AM signals. In Broadcast type, there is a single broadcasting station interfaced with satellite and satellite will relay signals to all the VSATs. Here broadcasting station-satellite-all VSATs link exist. In point to point type of topology, two VSATs communicate via satellite using dedicated assigned channel. So here VSAT1-Satellite-VSAT2 dedicated link exist.

Phase and Frequency Modulation are the two other types of modulation that can be used to impose data onto a carrier frequency. Frequency modulation (FM) is used for everyday FM radio. The signals are imposed into the carrier by adjusting the frequency of the carrier. In the diagram below, the signal that needs to be sent is the on top. types of radio signals that use a single narrow channel. Spread spectrum is extremely efficient, so the radio transmitters can operate with very low power. Because the signals operate on a relatively wide band of frequencies, Table Wi-Fi Standards and Modulation Type Wi-Fi Type Frequency Modulation a 5 GHz OFDM b GHz DSSS. A wireless signal needs to be modulated--or changed--to send information. There are many types of modulation, and different technologies can use one or more types to send and receive information. In the two examples below -- AM and FM radio -- the M stands for modulation. The type of modulation is what makes them different. Examining modulation, coding and multiple access techniques, the book is divided into two major sections to cover these functions. The two-stage approach first treats the basics of modulation and coding theory before highlighting how these concepts are defined and implemented in modern wireless communication systems.