Digital Signal Processing Reference
In-Depth Information
Q axis
(t=2)
(t=3)
(t=5)
I axis
(t=1)
(t=4)
Figure 17.3. Constellation trajectory.
generated as two separate signals, and later combined together
with a carrier frequency to form a single passband signal.
Note the sharp transitions of the I and Q signals at each
symbol. This requires the signal to have high-frequency content.
A signal that is of low frequency can change only slowly and
smoothly.
I component
Q component
t=1
t=2
t=3
t=4
t=5
Figure 17.4. Separated component plots.
