A system and method of the present invention forms a hybrid encoded signal. A signal generator generates a coded waveform having a trellis structure, such as a continuous phase modulated signal. A modulator is operative with the signal generator and adds at least one orthogonal or amplitude modulated...http://www.google.co.uk/patents/US7561634?utm_source=gb-gplus-sharePatent US7561634 - Continuous phase modulation system and method with added orthogonal signals
