CSE3213_05_AnalogDigitalTransmissionW2012_Part_5

CSE3213_05_AnalogDigitalTransmissionW2012_Part_5 - channel...

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21 Analog vs. Digital Transmission Low-pass Channel bandwidth = [0, f 1 ) entire medium/bandwidth dedicated to 2 devices devices alternate in transmission Band-pass Channel bandwidth = [f 1 , f 2 ) medium is shared among multiple users each pair of user s gets a portion of overall bandwidth
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22 Analog vs. Digital Transmission (cont.) Digital Transmission Advantages signal can be transmitted over long-distance without loosing any quality can operate with lower signal levels lower system cost easier to apply encryption easier integration of voice, video and data Digital Transmission Disadvantages digital signal theoretically needs a bandwidth [0, ) – upper limit can be relaxed if we decide to work with a limited number of harmonics digital transmission needs a low-pass channel analog transmission can use a band-pass
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Unformatted text preview: channel Both analog and digital data may be transmitted on suitable transmission media using either digital coding or analog modulation . 23 Analog vs. Digital Transmission (cont.) low-pass channel (digital signal) band-pass channel (analog signal) digital or analog data digital or analog data digital or analog data digital or analog data 24 Analog vs. Digital Transmission (cont.) Example [ digital transmission of digital and analog data ] Digital Data Digital Signal: Line Coding Analog Data Digital Signal: PCM (Pulse Code Modul.) or Delta Modulation 25 Analog vs. Digital Transmission (cont.) Example [ analog transmission of digital and analog data ] Digital data Analog Signal: Digital Modulation Analog data Analog Signal: Analog Modulation...
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This note was uploaded on 02/14/2012 for the course CSE 3213 taught by Professor A during the Winter '10 term at York University.

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CSE3213_05_AnalogDigitalTransmissionW2012_Part_5 - channel...

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