02. physical1

02. physical1 - 1 Physical Layer 1 Transmission, Media...

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Unformatted text preview: 1 Physical Layer 1 Transmission, Media & Encoding 2 Outline ¡ Functionalities ¡ Analog & Digital ¡ Time & Frequency ¡ Transmission Medium ¡ Transmission Impairments ¡ Encoding Communication Networks © Kang Xi, Polytechnic Institute of NYU 3 Physical Layer ¡ Goal ¢ Provide reliable data transmission ¢ 0100 1101 0101 Æ 0100 1101 0101 ¡ Physical Layer Defines ¢ Medium ¢ Signals ¢ Data rate ¢ Encoding ¢ Mechanical Communication Networks © Kang Xi, Polytechnic Institute of NYU 4 Transmission Direction ¡ Simplex: ¢ A Æ B only ¡ Half-Duplex: ¢ A Æ B and B Æ A, but not simultaneously ¡ Full-Duplex: ¢ A Æ B and B Æ A, and simultaneously Communication Networks © Kang Xi, Polytechnic Institute of NYU 5 Analog & Digital Communication Networks © Kang Xi, Polytechnic Institute of NYU 6 Analog & Digital ¡ Real world ¢ Mostly analog ¡ Why digital ¢ All information Æ bits ¢ Unified storage, transmission, processing Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 Benefit of Digitization 1 ¡ Processing: VLSI ¢ Modulation ¢ Mass production ¢ Integration ¢ Reliable Communication Networks © Kang Xi, Polytechnic Institute of NYU 8 Benefit of Digitization 2 ¡ Robust to noise 1 0 1 Communication Networks © Kang Xi, Polytechnic Institute of NYU 9 Benefit of Digitization 3 ¡ Multiplexing Communication Networks © Kang Xi, Polytechnic Institute of NYU 10 Benefit of Digitization 4 ¡ Integration Communication Networks © Kang Xi, Polytechnic Institute of NYU 11 Benefit of Digitization 5 ¡ Encryption Communication Networks © Kang Xi, Polytechnic Institute of NYU Frequency Components of a Signal 12 Communication Networks © Kang Xi, Polytechnic Institute of NYU 13 Time & Frequency 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-8-6-4-2 2 4 6 8 5sin (2 π 4t) Amplitude = 5 Frequency = 4 Hz seconds Communication Networks © Kang Xi, Polytechnic Institute of NYU 14...
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This note was uploaded on 11/02/2010 for the course EE 136 taught by Professor Kang xi during the Spring '10 term at NYU Poly.

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02. physical1 - 1 Physical Layer 1 Transmission, Media...

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