Lee01-Intro - Digital Communication System Source coding...

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Digital Communication System
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Source coding • Represent signals into digital data (e.g. bits) – E.g. video, audio • How to use as little amount of digital data as possible without losing any information • How to use as little amount of digital data as possible with an acceptable loss of information (fidelity)
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Channel coding Adding redundancy to correct error; e.g.,
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Modulation modulator channel demodulator Source Signal Bit stream Dest. bit + n (t) Converting bits to waveforms e.g., Digital modulation
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Intuitive picture Naive
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Digital Modulation examples 11 1 1 0 00 t ON-OFF keying e.g. optical fiber 01 01 11 00 11 00 m 0 01 m 1 10 m 2 11 m 3 Bits Symbol
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Amplitude Shift Keying (ASK) T s m 0 m 1 m 2 m 3 Bit duration vs Symbol duration
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Frequency Shift Keying (FSK) T s m 0 m 1 ( ) [ ] 0 cos 2 c Af t f t π +∆ ( ) [ ] 1 cos 2 c t f t π m i ( ) [ ] cos 2 ci t f t π
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Phase Shift Keying (PSK) {} ( ) 01 1 ,, , cos 2 iM ic i mm m m mA f t πθ =+ " t T s different Phase
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Quadrature PSK ( ) [ ]( ) ( ) [ ) () ( ) 00 11 22 33 :cos(2 ) cos cos 2 s in s in 2 (0, 0) : , , 4 31 1 (0,1) : , 4 51 1 (1, 1) : , 4 71 1 (1, 0) : , 4 ic i i c i c mf t f t f t m m m m πθ θ π θ π π θ π θ π θ π
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This note was uploaded on 10/07/2009 for the course ENSC 5210 taught by Professor Daniellee during the Spring '08 term at Simon Fraser.

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Lee01-Intro - Digital Communication System Source coding...

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