Lecture 16

Lecture 16 - Lecture 16 SSB and Pulse-Amplitude Modulation...

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1 Lecture 16 – SSB and Pulse-Amplitude Modulation ECSE304 Signals and Systems II ECSE 304 Signals and Systems II Lecture 16: Single Sideband and Pulse- Amplitude Modulation Reading: O and W Sections 8.4 - 8.6 Richard Rose McGill University Dept. of Electrical and Computer Engineering 2 Lecture 16 – SSB and Pulse-Amplitude Modulation ECSE304 Signals and Systems II • Single Sideband (SSB) Modulation • Pulse Train Modulation • Pulse Amplitude Modulation (PAM) • Inter-symbol Interference in PAM Outline
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3 Lecture 16 – SSB and Pulse-Amplitude Modulation ECSE304 Signals and Systems II • Problem with Sinusoidal Amplitude Modulation: – Band limited modulating signal with has bandwidth – Sinusoidal amplitude modulation creates two copies of centered at frequencies and – This redundancy results in twice the bandwidth and power requirements Single-Sideband Sinusoidal Amplitude Modulation () 0 , M Xj ω ωω = > 2 M X j c c AM-DSB/SC AM-DSB/WC 4 Lecture 16 – SSB and Pulse-Amplitude Modulation ECSE304 Signals and Systems II SSB AM keeps only half of the original spectrum around and half around Single-Sideband Sinusoidal (SSB) Amplitude Modulation c c Original Signal Double Sideband (DSB) Amplitude Modulation Single-Sideband (SSB) Amplitude Modulation - Upper Sidebands Single-Sideband (SSB) Amplitude Modulation - Lower Sidebands can still be recovered from only upper or lower sidebands
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5 Lecture 16 – SSB and Pulse-Amplitude Modulation ECSE304 Signals and Systems II • System for retaining upper sidebands: Use an ideal high-pass filter with cut-off frequency Single-Sideband Sinusoidal (SSB) Amplitude Modulation c ω x cos c t () hp Hj u yt c c 1 x t y t is an ideal high pass filter with high cut-off frequency The problem is that it’s difficult to implement a highpass filter with varying cutoff at high frequencies hp u Y j Yj hp H j 6 Lecture 16 – SSB and Pulse-Amplitude Modulation ECSE304 Signals and Systems II
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Lecture 16 - Lecture 16 SSB and Pulse-Amplitude Modulation...

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