Adaptive link communications using adaptive chaotic spread waveform

A method for providing communications link with a power-limited communication transmitter positioned remotely from an intended receiver system, where said communication link is resistant to natural and artificial sources of interference, said method comprising:

• channel encoding a carrier signal with data provided at said power-limited communication transmitter to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence, said chaotic spreading sequence having a magnitude that is constant and a variable arbitrary phase angle comprising phase values which are uniformly distributed over a predetermined range of angles;
• forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having an adaptable amplitude characteristic and a zero autocorrelation;
• and
• transmitting said spread spectrum signal from said power-limited communication transmitter to said intended receiver system;
• wherein said chaotic spreading sequence is selectively modified to induce a pseudorandom or chaotic variation in said magnitude of said chaotic spreading sequence to increase a peak to average power ratio (PAPR) of said spread spectrum signal;
• wherein an average deviation of said magnitude of said chaotic spreading sequence is modified to selectively control said PAPR of said spread spectrum signal, responsive to a measured signal to interference (S/I) ratio or an estimated S/I ratio;
• and
• wherein power-limited communication transmitter is configured to transmit information signals comprising data in a digital format.

A method for providing communications link with a power-limited communication transmitter positioned remotely from an intended receiver system, where said communication link is resistant to natural and artificial sources of interference, said method comprising:

• channel encoding a carrier signal with data provided at said power-limited communication transmitter to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence, said chaotic spreading sequence having a magnitude that is constant and a variable arbitrary phase angle comprising phase values which are uniformly distributed over a predetermined range of angles;
• forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having an adaptable amplitude characteristic and a zero autocorrelation;
• and
• transmitting said spread spectrum signal from said power-limited communication transmitter to said intended receiver system;
• wherein the spreading ratio of said chaotic spreading sequence is selectively varied in response to a measured signal to interference (S/I) ratio or an estimated S/I ratio.

A method for providing communications link with a power-limited communication transmitter positioned remotely from an intended receiver system, where said communication link is resistant to natural and artificial sources of interference, said method comprising:

• channel encoding, at said power-limited communication transmitter, a carrier signal with data using Phase Shift Keying (PSK) to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence;
• selecting said chaotic spreading sequence with a constant magnitude, and a chaotically varying arbitrary phase angle including phase values which are band limited and distributed over a predetermined range of angles;
• forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having a first peak to average power ratio (PAPR);
• detecting current operating conditions of a communication environment;
• dynamically transforming said spread spectrum signal with said first PAPR to a chaotic signal with a second PAPR having a higher value than said first PAPR, based on said current operating conditions of the communication environment;
• and
• transmitting said chaotic signal from said power-limited communication transmitter to said intended receiver system;
• wherein said spread spectrum signal is dynamically transformed to said chaotic signal at least by selectively varying an average deviation of said magnitude of said chaotic spreading sequence.

A method for providing communications link with a power-limited communication transmitter positioned remotely from an intended receiver system, where said communication link is resistant to natural and artificial sources of interference, said method comprising:

• channel encoding, at said power-limited communication transmitter, a carrier signal with data using Phase Shift Keying (PSK) to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence;
• selecting said chaotic spreading sequence with a pseudo-randomly or chaotically variable magnitude, and a chaotically varying arbitrary phase angle including phase values which are band limited and distributed over a predetermined range of angles;
• forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having a peak to average power ratio (PAPR);
• selectively varying an average deviation of said magnitude of said chaotic spreading sequence to selectively control said PAPR, responsive to a measured signal to interference (S/I) ratio or an estimated S/I ratio;
• and
• transmitting said spread spectrum signal from said power-limited communication transmitter to said intended receiver system.

A method for providing communications link with a power-limited communication transmitter positioned remotely from an intended receiver system, where said communication link is resistant to natural and artificial sources of interference, said method comprising:

• channel encoding, at said power-limited communication transmitter, a carrier signal with data using Phase Shift Keying (PSK) to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence;
• selecting said chaotic spreading sequence with a pseudo-randomly or chaotically variable magnitude, and a chaotically varying arbitrary phase angle including phase values which are band limited and distributed over a predetermined range of angles;
• forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having a peak to average power ratio (PAPR);
• selectively varying an average deviation of said magnitude of said chaotic spreading sequence to selectively control said PAPR;
• and
• transmitting said spread spectrum signal from said power-limited communication transmitter to said intended receiver system;
• wherein said average deviation is decreased as an S/I ratio decreases.

A method for providing communications link with a power-limited communication transmitter positioned remotely from an intended receiver system, where said communication link is resistant to natural and artificial sources of interference, said method comprising:

• channel encoding, at said power-limited communication transmitter, a carrier signal with data using Phase Shift Keying (PSK) to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence;
• selecting said chaotic spreading sequence with a pseudo-randomly or chaotically variable magnitude, and a chaotically varying arbitrary phase angle including phase values which are band limited and distributed over a predetermined range of angles;
• forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having a peak to average power ratio (PAPR);
• selectively varying an average deviation of said magnitude of said chaotic spreading sequence to selectively control said PAPR;
• reducing said average deviation to approximately zero in the presence of a maximum predetermined signal to interference level;
• and
• transmitting said spread spectrum signal from said power-limited communication transmitter to said intended receiver system.