chap09 - Wireless Transmission and Services Chapter 9...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Wireless Transmission and Services Chapter 9
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Objectives Associate electromagnetic waves at different points on the wireless spectrum with their wireless services Identify characteristics that distinguish wireless transmission from wire-bound transmission Explain the architecture and access methods used in cellular net-works and services Understand the differences between wireless and wireline local loops Describe the most popular WLAN standards, including their advantages, disadvantages, and uses Identify the major satellite positioning schemes and list several telecommunications services that rely on satellite transmission
Background image of page 2
The Wireless Spectrum
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The Wireless Spectrum
Background image of page 4
The Wireless Spectrum
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Characteristics of Wireless Transmission
Background image of page 6
Antennas Radiation pattern - the relative strength over a three dimensional area of all the electromagnetic energy the antenna sends or receives. Directional antenna - issues wireless signals along a single direction
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Antennas Omni- directional antenna - issues and receives wireless signals with equal strength and clarity in all directions.
Background image of page 8
Signal Propagation Reflection - the wave encounters an obstacle and bounces back towards its source. Diffraction - a wireless signal splits into secondary waves when it encounters an obstruction. Scattering - the diffusion, or the reflection in multiple different directions of a signal.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Signal Propagation
Background image of page 10
Signal Propagation Fading and Delay Fading: a change in signal strength as result of some of the electromagnetic energy being scattered, reflected, or diffracted after being issued by the transmitter. Diversity - the use of multiple antennas or multiple signal transmissions to compensate for fading and delay.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Signal Propagation Attenuation - after a signal has been transmitted, the farther it moves away from the transmission antenna, the more it weakens. Interference
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/25/2009 for the course IT 300 taught by Professor Staff during the Spring '08 term at George Mason.

Page1 / 40

chap09 - Wireless Transmission and Services Chapter 9...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online