Carrier-Amplitude Modulation
There are four types of carrier-modulated signals are suitable
for bandpass channels: amplitude-modulated signals, quadrature-amplitude-modulated
signals, phase-shift keying, and frequency-shift keying.
Reference,
1. <<Contemporary Communication System using MATLAB>> - John G. Proakis
CCS - Digital Transmission via Carrier Modulation - Carrier-Amplitude Modulation
原文：https://www.cnblogs.com/zzyzz/p/13664069.html