Method and apparatus for providing energy dispersal using frequency diversity in a satellite communications system

A communications system for transmitting and receiving digital data at a predetermined data rate comprising:

• first channel generating means for generating a plurality of adjacent digital channels, each channel having a sinusoidal waveform in a mathematical relationship to each sinusoidal waveform of each other channel and a phase relationship to the predetermined data rate;
• means for modulating the digital data by a carrier frequency;
• means responsive to said first generating means and said modulating means for forming a composite signal by impressing the modulated digital data onto each channel;
• means for transmitting the composite signal;
• means for receiving the composite signal;
• clock recovery means for recovering a data clock based on the predetermined data rate of the received composite signal;
• second channel generating means, responsive to the data clock, for generating each channel generated by said first channel generating means, each channel having a sinusoidal waveform in the mathematical relationship to each sinusoidal waveform of each other channel and the phase relationship to the predetermined data rate prescribed by said first channel generating means;
• means, responsive to said second channel generating means, for coherently combining channels generated by said second channel generating means with the composite signal to recover the modulated digital data;
• and
• demodulating means for demodulating the digital data.

In a system for receiving a modulated data signal transmitted at a predetermined data rate via a communication link, a receiving apparatus comprising:

• clock recovery means for recovering a data clock based on the predetermined data rate from the modulated data signal;
• periodic waveform generating means, responsive to the data clock, for generating a plurality of adjacent digital channels, each channel having a sinusoidal waveform having a first mathematical relationship to each sinusoidal waveform of each other channel and a phase relationship to the predetermined data rate;
• means, responsive to said waveform generating means, for recovering digital data from the modulated data signal based on each sinusoidal waveform of each channel;
• and
• demodulating means for demodulating the digital data.

In a system for transmitting digital data having a predetermined data rate via a communication link to a receiver, a transmitting apparatus comprising:

• periodic waveform generating means for generating a plurality of adjacent digital channels, each channel having a sinusoidal waveform having a mathematical relationship to each sinusoidal waveform of each other channel and a phase relationship to the predetermined data rate;
• means for modulating the digital data by a carrier frequency;
• and
• means responsive to said waveform generating means and said modulating means for forming a composite signal by impressing the modulated digital data onto each channel.

A method of dispersing energy over a wide bandwidth when communicating digital data having a predetermined data rate, said method comprising the steps of:

• modulating the digital data by a predetermined carrier frequency;
• generating a plurality of M adjacent channels, M being an integer multiple of two less than or equal to sixteen, wherein each channel has a sinusoidal waveform mathematically related to each sinusoidal waveform of each other channel and each channel has a predetermined phase relationship to the digital data having the predetermined data rate;
• and
• dispersing the modulated digital data on the M channels, wherein each channel contains the same modulated digital data.

In a communications system for transmitting and receiving digital data at a predetermined data rate a method comprising the steps of:

• a) generating a plurality of adjacent digital channels, each channel having a sinusoidal waveform having a mathematical relationship to each sinusoidal waveform of each other channel and a phase relationship to the predetermined data rate;
• b) modulating the digital data by a carrier frequency;
• c) impressing the modulated digital data onto each channel to form a composite signal;
• d) transmitting the composite signal from a first station;
• e) receiving the composite signal at a second station;
• f) recovering a data clock based on the predetermined data rate of the received composite signal;
• g) generating sinusoidal waveforms based on the recovered data clock, the sinusoidal waveforms corresponding to each channel generated at said step a), each sinusoidal waveform having the mathematical relationship to each other sinusoidal waveform and the phase relationship prescribed at said step a);
• h) recovering the modulated digital data from the composite signal based on the sinusoidal waveforms generated at said step g);
• and
• i) demodulating the digital data.

A method of receiving a modulated data signal transmitted at a predetermined data rate via a communication link, comprising the steps of:

• recovering a data clock from the modulated data signal based on the predetermined data rate;
• in response to the data clock, generating sinusoidal waveforms, each sinusoidal waveform corresponding to at least one of a plurality of adjacent digital channels, each sinusoidal waveform having a mathematical relationship to each other sinusoidal waveform and a phase relationship to the predetermined data rate;
• recovering modulated digital data from the modulated data signal based on the generated sinusoidal waveforms;
• and
• demodulating the digital data.

A method of transmitting digital data having a predetermined data rate via a communication link to a receiver comprising the steps of:

• generating a plurality of adjacent digital channels, each channel having a sinusoidal waveform having a mathematical relationship to each sinusoidal waveform of each other channel and a phase relationship to the predetermined data rate;
• modulating the digital data by a carrier frequency;
• and
• impressing the modulated digital data onto each channel to form a composite signal.