May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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Analog and Digital Transmission 59
Bits Phase
00
45°
01
135°
10
−135°
11
−45°
00
01
10
11
Figure 3.29 Constellation Diagram for QPSK Signal
Quadrature
carrier
In-phase carrier
Peak amplitude
of quadrature
component
Peak amplitude
of in-phase
component
Phase
Peak amplitude
of signal element
Figure 3.28 Constellation Diagram
27. Write a short note on quadrature amplitude modulation (QAM).
Ans: QAM technique combines the idea of ASK
and PSK. That is, instead of changing only one at-
tribute of a carrier, two attributes including ampli-
tude and phase of the carrier signal are changed. Like
QPSK, it uses two carriers (one is in-phase and the
other is quadrature) ...
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