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Chapter: Analog and Digital Communication

Quadrature Amplitude modulation (QAM)

Quadrature Amplitude modulation (QAM): QAM is a form of digital modulation similar to PSK except the digital information is contained in both the amplitude and phase of the transmitted carrier.

QUADRATURE AMPLITUDE MODULATION:

 

 

Quadrature Amplitude modulation (QAM): QAM is a form of digital modulation similar to PSK except the digital information is contained in both the amplitude and phase of the transmitted carrier.

 

 

 

·     QAM is a combination of ASK and PSKTwo different signals sent simultaneously on the same carrier frequency ie,M=4, 16, 32, 64, 128, 256 As an example of QAM, 12 different phases are combined with two different amplitudes.

 

 

·     Since only 4 phase angles have 2 different amplitudes, there are a total of 16 combinations. With 16 signal combinations, each baud equals 4 bits of information (2 ^ 4 16).

 

·     Combine ASK and PSK such that each signal corresponds to multiple bits.

 

More phases than amplitudes. Minimum bandwidth requirement same as ASK or PSK

 



 

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Analog and Digital Communication : Quadrature Amplitude modulation (QAM) |


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