A signal generator generates a coded or memory waveform having a trellis structure. A modulator is operative with the signal generator for adding at least one phase pulse to the trellis structure of the coded or memory waveform to create a substantially constant envelope modulated signal that increases...http://www.google.co.uk/patents/US7539257?utm_source=gb-gplus-sharePatent US7539257 - Continuous phase modulation system and method with added phase pulse
