CSE3213_08_AnalogModulation_W2012

CSE3213_08_AnalogModulation_W2012 - 1 Analog Transmission...

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1 Analog Transmission of Analog Data: AM, FM and PM CSE 3213, Winter 2012 Instructor: Dusan Stevanovic Required reading: -
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2 Modulation of Analog Data Why Analog-to-Analog Modulation? two principal reasons for combining an an analog signal with a carrier at freq. f c : (1) higher freq. may be needed for effective transmission in wireless domain, it is virtually impossible to transmit baseband signals – the required antennas would be many kilometres in diameter (2) modulation permits FDM (freq. division multiplexing) more on this later … example: radio analog signals produced by radio stations are low-pass, all in the same range - to be able to listen to different stations, the low-pass signals need to be shifted, each to a different range FDM in time-domain FDM in frequency-domain
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3 Modulation of Analog Data (cont.) Types of Analog-to-Analog Modulation
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4 Amplitude Modulation Amplitude amplitude of the carrier signal varies with the changing amplitude of input/modulating signal; frequency and phase remain unchanged A c – carrier amplitude k a amplitude sensitivity of the modulator , must be: to ensure that the function [1+k a x(t)] is always positive
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CSE3213_08_AnalogModulation_W2012 - 1 Analog Transmission...

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