Patent ID: 7929640

Claim:
A data encoder for high speed modulation of a carrier signal, the data encoder comprising: an Exclusive-OR (XOR) gate having a first and second input and an output; a first phase shifter, having a predetermined phase shift, connected to the first input of the XOR gate; a second phase shifter having a predetermined phase shift, different from the first phase shifter, connected to the second input of the XOR gate; a first differential encoder for supplying a first differentially encoded two state data stream having a first bit rate, to the first phase shifter; and a second differential encoder for supplying a second differentially encoded two state data stream having a second bit rate, equal to the first bit rate, to the second phase shifter; the XOR gate combining the first and second differentially phase shifted, two state encoded data streams having the same bit rates into a single two state data stream having a bit rate that is the sum of the first and second bit rates, for modulating the carrier signal.