chap09 - Wireless Transmission and Services Chapter 9...

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Wireless Transmission and Services Chapter 9
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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
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The Wireless Spectrum
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The Wireless Spectrum
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The Wireless Spectrum
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Characteristics of Wireless Transmission
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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
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Antennas Omni- directional antenna - issues and receives wireless signals with equal strength and clarity in all directions.
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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.
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Signal Propagation
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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.
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Signal Propagation Attenuation - after a signal has been transmitted, the farther it moves away from the transmission antenna, the more it weakens.
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