Page 93 - Complete Wireless Design
P. 93
Modulation
92 Chapter Two
Figure 2.45 (a) A perfect QAM-16 constellation diagram; (b) a CW signal interference tone effect on the
constellation diagram; (c) signal degradation caused by a poor SNR; (d) signal degradation caused by the digital
radio’s local oscillator instability; (e) slight overdriving of the transmitter’s power amplifier; (f) multipath causing
an uneven amplitude across the passband of the digital signal.
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