Data_Transmission

Data_Transmission - Basic Concepts in Data Transmission...

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A.Zahid-EE450 1 Basic Concepts in Data Transmission EE450: Introduction to Computer Networks Professor A. Zahid
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A.Zahid-EE450 2 Data and Signals Data is an entity that convey information Analog • Continuous values within some interval • e.g. sound, video Digital • Discrete values • e.g. text, integers Signals are electrical or electromagnetic or optical representations of data
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A.Zahid-EE450 3 Continuous and Discrete Signals
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A.Zahid-EE450 4 Periodic Signals “Pattern repeated over time”
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A.Zahid-EE450 5 Parameters of a Periodic Signal • Peak Amplitude (A) – Maximum strength of signal – Measured in volts or amps • Frequency (f) – Rate of change of signal – Measured in Hertz (Hz) or cycles per second – The Period of a periodic signal, T = 1/f •P h a s e ( φ ) – Relative position in time
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A.Zahid-EE450 6 Examples
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A.Zahid-EE450 7 Frequency Domain Concepts • 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 • Example shows the addition of two sinusoids
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A.Zahid-EE450 8 Time vs. Frequency Domains t(sec) x(t) 1 -X/2 0 X/2 Time Domain Frequency Domain
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A.Zahid-EE450 9 Spectrum of the Signal – range of frequencies contained in signal Bandwidth of the Signal – width of spectrum – Telephony (Voice) bandwidth 300Hz ~ 3400Hz
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This note was uploaded on 03/01/2008 for the course EE 450 taught by Professor Zahid during the Spring '06 term at USC.

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Data_Transmission - Basic Concepts in Data Transmission...

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