ANTI-JAM COMMUNICATIONS HAVING SELECTIVELY VARIABLE PEAK-TO-AVERAGE POWER RATIO INCLUDING A CHAOTIC CONSTANT AMPLITUDE ZERO AUTOCORRELATION WAVEFORM
First Claim
1. A method for generating an adaptive PAPR chaotic communication signal, comprising:
- phase modulating a carrier signal with data 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 having a variable arbitrary phase angle comprising phase values which are uniformly distributed over a predetermined range of angles; and
forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having a constant amplitude and a zero autocorrelation.
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Abstract
A spread spectrum communication system includes a channel encoder configured for modulating a carrier signal with data to form an information signal. A spreading sequence generator is configured for generating a spreading sequence having a phase angle dependent upon a chaotic sequence and contiguously distributed over a predetermined range. The chaotic sequence also has a magnitude which is selectively dependent upon the pseudo-random number or chaotic sequence. The invention also includes a multiplier configured for forming a spread spectrum signal by multiplying the information signal by the spreading sequence. The spreading sequence generator is responsive to a magnitude control signal for controlling the selective dependency of said magnitude. The magnitude can be constant to form a constant amplitude zero autocorrelation signal. Alternatively, the magnitude can be allowed to vary in selectively controlled chaotic or pseudo-random manner to vary a peak to average power ratio.
111 Citations
29 Claims
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1. A method for generating an adaptive PAPR chaotic communication signal, comprising:
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phase modulating a carrier signal with data 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 having a variable arbitrary phase angle comprising phase values which are uniformly distributed over a predetermined range of angles; and forming a spread spectrum signal by multiplying said information signal by said chaotic spreading sequence, said spread spectrum signal having a constant amplitude and a zero autocorrelation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for constructing an adaptive communication signal robust in the presence of natural or man-made interference, comprising:
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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. - View Dependent Claims (13, 14, 15, 16)
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17. A spread spectrum communication system, comprising:
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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. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A spread spectrum communication system, comprising:
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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.
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Specification