Anti-jam communications having selectively variable peak-to-average power ratio including a chaotic constant amplitude zero autocorrelation waveform

A method for constructing an adaptive communication signal robust in the presence of natural or man-made interference, comprising:

• modulating a carrier signal with data to form an information signal;
• generating a chaotic spreading sequence based on a chaotic number sequence;
• selecting said chaotic spreading sequence to have 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);
• and
• selectively varying an average deviation of said pseudo-randomly or chaotically variable magnitude of said chaotic spreading sequence to selectively control said PAPR.

A spread spectrum communication system, comprising:

• a channel encoder configured for phase modulating a carrier signal with data to form an information signal;
• a spreading sequence generator configured for generating a spreading sequence having a phase angle dependent upon a chaotic number sequence and a magnitude which is selectively dependent upon a pseudo-random number or chaotic sequence;
• and
• a multiplier configured for forming a spread spectrum signal by multiplying said information signal by said spreading sequence;
• wherein said spreading sequence generator is responsive to a control signal for controlling said selective dependency of said magnitude.

A spread spectrum communication system, comprising:

• a channel encoder configured for modulating a carrier signal with data to form an information signal;
• a spreading sequence generator configured for generating a spreading sequence having a constant magnitude and an arbitrary phase angle dependent upon a chaotic number sequence and distributed over a predetermined range of angles;
• and
• a multiplier configured for forming a spread spectrum signal by multiplying said information signal by said spreading sequence;
• wherein said spread spectrum communication system generates a constant amplitude, zero autocorrelation spread spectrum signal.