physical1

physical1 - Physical Layer 1 Transmission, Media & Encoding...

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1 Physical Layer 1 Transmission, Media & Encoding
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2 Physical Layer Goal Provide reliable data transmission 0100 1101 0101 0100 1101 0101 Physical Layer Defines Medium Signals Data rate Encoding Mechanical Communication Networks © Kang Xi, Polytechnic Institute of NYU
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3 Transmission Direction Simplex: A B only Half-Duplex: A B and B A, but not simultaneously Full-Duplex: A B and B A, and simultaneously Communication Networks © Kang Xi, Polytechnic Institute of NYU
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4 Communication Networks © Kang Xi, Polytechnic Institute of NYU
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5 Real world Mostly analog Why digital All information bits Unified storage, transmission, processing Communication Networks © Kang Xi, Polytechnic Institute of NYU
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6 Benefit of Digitization Robust to noise 1 0 1 Communication Networks © Kang Xi, Polytechnic Institute of NYU
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7 Benefit of Digitization Powerful digital signal processing based on VLSI Data, voice and video integration Strong encryption Communication Networks © Kang Xi, Polytechnic Institute of NYU
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Analog Digital 8 Communication Networks © Kang Xi, Polytechnic Institute of NYU
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Sampling Time domain: continuous to discrete What is the sampling rate? Quantization Amplitude: continuous to discrete How many levels to use? Encoding Expressed in bits How many bits? 9
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This note was uploaded on 04/06/2011 for the course EE 5363 taught by Professor Kang during the Spring '09 term at NYU Poly.

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physical1 - Physical Layer 1 Transmission, Media & Encoding...

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