Quadrature Amplitude Modulation (QAM) and Pilot carrier

Q.  Quadrature Amplitude Modulation (QAM) is
- Published on 13 Oct 15

a. Have same bandwidth used for two DSB-SC signals
b. Is also known as Bandwidth Conservation scheme
c. Is used in color television
d. All of the above

ANSWER: All of the above
 
The modulation scheme Quadrature Amplitude Modulation (QAM) enables same bandwidth used for transmission of two DSB-SC signals. It is also known as Bandwidth Conservation scheme. However it needs synchronous detection so it needs an additional system for generation of carrier. Also known as Quadrature Carrier Multiplexing, the scheme is used in color television.

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