A synchronous detector for demodulating and decoding a digital data signal modulated either according to a vestigial sideband or a quadrature amplitude modulation scheme is based upon the principle of recognizing that a vestigial sideband signal may be regarded and treated as an offset-keyed QAM signal....http://www.google.fr/patents/US5477199?utm_source=gb-gplus-shareBrevet US5477199 - Digital quadrature amplitude and vestigial sideband modulation decoding method and apparatus
Digital quadrature amplitude and vestigial sideband modulation decoding ...
