Parallel dataword modulation scheme

A method of transmitting digital information over a radio frequency channel comprising the steps of:

• a) assembling data to be transmitted into data words each having N bits;
• b) transforming a carrier signal into a frequency spectrum in a frequency domain;
• c) separating the frequency spectrum of the carrier signal into a plurality of tones, one corresponding to a synchronization reference and the remainder each corresponding to a bit of a data word to be transmitted;
• d) shifting tones by a predetermined phase shift if the corresponding bit has a value of `1` for a first data word to be transmitted;
• e) inverse transforming the tones into a radio signal;
• f) transmitting a radio signal incorporating the phase shifts of the tones for the first data word at time t;
• g) repeating steps (d)-(f) for all data words to be transmitted;
• h) receiving the radio signal at a receiver;
• i) transforming the received radio signal into a received frequency spectrum;
• j) synchronizing the received radio signal so as to identify portions of the radio signal corresponding to different data words;
• and
• k) separating the received radio signal into data word intervals each corresponding to data word, and for each data word interval:
• 1. separating the spectrum of the data word interval into data word tones,
• 2. identifying the phase shift of each data word tone to identify bit values of the data word, and
• 3. constructing the data word from the bit values.