Part_4_Data_Transmission

Part_4_Data_Transmission - Basic Concepts in Data...

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EE450, USC, Zahid 1 Basic Concepts in Data Transmission EE450: Introduction to Computer Networks Professor A. Zahid
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EE450, USC, Zahid 2 Data and Signals z Data is an entity that convey information z Analog Continuous values within some interval e.g. sound, video z Digital Discrete values e.g. text, integers z Signals are electrical or electromagnetic or optical representations of data
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EE450, USC, Zahid 3 Analog vs.Digital Signals
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EE450, USC, Zahid 4 Periodic Signals “Pattern repeated over time”
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EE450, USC, Zahid 5 Parameters of a Sinusoid z Peak Amplitude (A) z Maximum strength of signal z Measured in volts or amps z Frequency (f) z Rate of change of signal z Measured in Hertz (Hz) or cycles per second z The Period of a periodic signal, T = 1/f z Phase ( φ ) z Relative position in time z Measured in Degrees (or Radians)
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EE450, USC, Zahid 6 Varying Sine waves s(t)= A sin(2 π f t+ φ )
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EE450, USC, Zahid 7 Frequency Domain Concepts z Any arbitrary signal can be thought as a combination of many (may be infinite) components with each component being a sinusoidal waveform of given amplitude, frequency and phase z Example shows the addition of two sinusoids
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EE450, USC, Zahid 8 Time vs. Frequency Domains t(sec) x(t) 1 -X/2 0 X/2
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EE450, USC, Zahid 9 Spectrum and Bandwidth z Spectrum of the Signal z range of frequencies contained in signal z Bandwidth of the Signal z width of spectrum z Telephony (Voice) bandwidth 300Hz~ 3400Hz z Video bandwidth 4~6 MHz z Bandwidth of Transmission System z Range of frequencies that will pass through the system without much degradation
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EE450, USC, Zahid 10 Analog Signals representing Analog/Digital Data
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EE450, USC, Zahid 11 Digital Signals representing Analog/Digital Data
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This note was uploaded on 12/29/2009 for the course EE 450 at USC.

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Part_4_Data_Transmission - Basic Concepts in Data...

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