Amplitude Smooth Modulation of QAM

It introduces an amplitude smooth modulation of QAM, in which the amplitude smooth change takes the place of the amplitude switch. And, some simulations of the modulation and demodulation in computer are made, finding out the best transition time, and showing that this method of the modulation is successful in reducing the frequency bandwidth. The research of the new modulation and demodulation technology can give technical support for the high quality and multi-user communication systems.