physical2

physical2 - 1 Physical Layer 2 Multiplexing Spread Spectrum...

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Unformatted text preview: 1 Physical Layer 2 Multiplexing, Spread Spectrum EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 2 Multiplexing EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 3 Objectives ¡ The purposes and requirements of multiplexing ¡ The principles of FDM, TDM, WDM and statistical multplexing ¡ DSL EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 4 Why Multiplexing? ¡ The fact ¢ # of point-to-point communications: large ¢ # of channels: small ¢ Dedicated channel: infeasible ¡ The requirement ¢ Multiple users share the same channel ¢ QoS of end users can be satisfied ¡ Definition ¢ Multiplexing: Channel sharing EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 5 Framework ¡ Regard a user-user communication as a stream ¡ Multiplexer (Mux) ¢ Combine multiple streams ¡ De-Multiplexer (DeMux) ¢ Pick out one/more streams out of the aggregation. M u x DeMux EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 6 Benefit ¡ Wired networks ¢ Each wire (copper, fiber) carries multiple streams ¢ Total # of wires reduced: low cost ¢ Dedicated links between users are not necessary ¡ Wireless networks ¢ Channels are naturally shared, dedicated transmission media unavailable ¢ Enables simultaneous wireless communication with no interference EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 7 General Principles for Mux/DeMux ¡ Theoretically feasible ¢ The aggregated streams CAN be separated again ¡ Technically feasible ¢ Acceptable complexity and cost ¡ High multiplexing gain ¢ Maximize channel utilization EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 8 FDM: Example ¡ Example ¢ Two speakers ¢ One listener ¢ Listener can hear either ¢ Key: speakers have different voice (frequency) ¢ Note: not 100% FDM Mux DeMux EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 9 FDM: Principle...
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This note was uploaded on 10/10/2011 for the course ECE 536 taught by Professor Sun during the Spring '11 term at NYU Poly.

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physical2 - 1 Physical Layer 2 Multiplexing Spread Spectrum...

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