The present invention in one embodiment provides for a propagated signal of (1) a time period divided into a group of time slots each having a unique phase/time position; and (2) multiple pulses distributed among the time slots encoding a data element by such unique phase/time position. ...http://www.google.com/patents/US20030142742?utm_source=gb-gplus-sharePatent US20030142742 - Modulation by combined multi-pulse per group with simultaneous phase and time shift keying and method of using the same
