physical2

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

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1 Physical Layer 2 Multiplexing, Spread Spectrum
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 2 Multiplexing
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 3 Objectives The purposes and requirements of multiplexing The principles of FDM, TDM, WDM and statistical multplexing DSL
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 4 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. Mux DeMux S1 S2 S3 D1 D2 D3
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 5 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
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 6 FDM: Example Example Two speakers One listener Listener can hear either Key: speakers have different voice (frequency) Note: not 100% FDM Mux DeMux
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Frequency Division Multiplexing Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 [globalspec.com]
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 8 FDM: Principle Different signals have non-overlapped spectrum a(t) = sin(t) b(t) = 5sin(t) a(t)+b(t): cannot pick out a(t) a’(t)= a(t) * sin(10t) b’(t)= b(t) * sin(20t) a’(t)+b’(t): can be separated
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© Kang Xi, Polytechnic Institute of NYU 9 FDM: Frequency Domain View Mux A number of baseband signals Modulate each signal
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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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physical2 - Physical Layer 2 Multiplexing Spread Spectrum 1...

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