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Unformatted text preview: 6 Modulation of Digital Data: ASK (cont.) Example [ ASK ] v d (t) v c (t) v ASK (t) How does the frequency spectrum of v ASK (t) look like!? f v d (f) v c (f) 7 Modulation of Digital Data: ASK (cont.) ASK-Modulated Signal: Frequency Spectrum t) cos( t) f cos(2 (t) v c c c ... t cos5 5 2 t cos3 3 2 t cos 2 2 1 A (t) v d Carrier signal: , where 2 f c = c Digital signal: (unipolar!!!) c d_max Modulated signal: ... t 3 cos t 3 cos 3 1- t cos t cos 1 t cos 2 1 ... t cos3 t cos 3 2- t cos t cos 2 t cos 2 1 ... t cos5 5 2 t cos3 3 2 t cos 2 2 1 t cos (t) v (t) v (t) v c c c c c c c c c d c ASK B) cos(A B)- cos(A 2 1 cosB cosA c c +...
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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.
- Winter '10