Spectrum efficient fast frequency-hopped modem with coherent demodulation

A system for increasing data transmission capacity over a wireless mobile link, while at the same time providing improved jamming resistance, comprising:

• a data stream;
• a d-TCM modulation unit coupled to said data stream for providing a number of symbols corresponding to said data stream, wherein each of said symbols has a phase and is transmitted at a frequency;
• means coupled to said modulation unit for determining the phase component and the amplitude component for each of said symbols,
• a frequency offset generating unit coupled to at least the phase component of said phase determining means for producing a signal representing a frequency offset associated with said phase;
• a frequency hopping synthesizer coupled to said amplitude component for hopping the carrier frequency utilized to transmit the amplitude component of said symbol and for adding to said carrier frequency the offset frequency from said frequency offset generating unit;
• means for amplifying the output of said frequency hopping synthesizer so as to produce a transmitted signal which conveys the amplitude and the phase of said symbol, with the phase of said symbol being conveyed by said frequency offset;
• and,
• means for receiving and decoding said transmitted signal to recover the phase and amplitude of a transmitted symbol;
• and
• means for offsetting the frequency at which said symbol is transmitted by an amount corresponding to the phase of said symbol.