The present invention provides for a propagated signal using multiple pulse per group keying and a method of using the same. In one embodiment the propagated signal includes: (1) an element of data contained within a time period of the propagated signal, the time period divided into a group of time slots;...http://www.google.de/patents/US20030142691?utm_source=gb-gplus-sharePatent US20030142691 - Modulation by multiple pulse per group keying and method of using the same
