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Unformatted text preview: However, sometimes, the carrier is physically absent in the modulated signal. Examples are AM with suppressed carrier or FM. Whether we need to regenerate the carrier in the receiver for the purpose of demodulation depends on the modulation scheme. For example, in FM, the regeneration of the carrier is not necessary. To demodulate, we just need to have some circuits to extract the instantaneous frequency of the modulated signal. For single sideband AM or suppressed carrier AM where we have to perform coherent demodulation, carrier regeneration is essential....
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This note was uploaded on 08/02/2009 for the course ECE EE2009 taught by Professor Prof.c.c.ko during the Fall '07 term at National University of Singapore.
- Fall '07