Patent ID: 7120198

Claim:
A system for modulating DS data on an I phase communicating DI data and on a Q phase communicating DQ data, the I phase and Q phase are phases of a modulated carrier signal communicating the DI data and the DQ data and the DS data, the carrier signal has a total phase equal to arctangent of the Q phase divided by the I phase, the system comprising, an encoder for encoding the DI data and the DQ data respectively into an Io encoded signal and a Qo encoded signal, an encoded subcarrier modulation signal generator for receiving one or more of the DS data and the DI data and the DQ data and for generating an encoded subcarrier modulation signal, the encoded subcarrier modulation signal comprises a product of a data partition function and the DS data, the data partition function is a function of one or more of the DI data and the DQ data and the DS data, a modulator for modulating a subcarrier signal by the encoded subcarrier modulation signal for providing a modulated subcarrier signal, for modulating the total phase of the carrier signal by the modulated subcarrier signal, for modulating the I phase of the carrier signal by the Io encoded signal and by an I phase subcarrier signal to provide an I phase carrier signal and for modulating the Q phase of the carrier signal by the Qo encoded signal and by a Q phase subcarrier signal to provide a Q phase carrier signal, the modulator combining the Q phase carrier signal and the I phase carrier signal as a composite signal, the I phase subcarrier signal is an I intermodulation product of the encoded subcarrier modulation signal and the Qo encoded signal, the Q phase subcarrier signal is a Q intermodulation product of the encoded subcarrier modulation signal and the Io encoded signal, the ratio of the Q intermodulation product over the I intermodulation product is equal to the ratio of the Io encoded signal over the Qo encoded signal, the composite signal has a constant amplitude envelop.