Chapter: Digital Communication : Digital Modulation Scheme
QAM(Quadrature Amplitude Modulation)
QAM is a combination of ASK and PSK
QAM(Quadrature Amplitude
Modulation):
• QAM is
a combination of ASK and PSK
Two
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 of
QAM is same as ASK or PSK.
Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Digital Communication : Digital Modulation Scheme : QAM(Quadrature Amplitude Modulation) |
Related Topics
Digital Communication : Digital Modulation Scheme