CA2727541A1 - Featureless coherent chaotic amplitude modulation - Google Patents

Featureless coherent chaotic amplitude modulation Download PDF

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Publication number
CA2727541A1
CA2727541A1 CA2727541A CA2727541A CA2727541A1 CA 2727541 A1 CA2727541 A1 CA 2727541A1 CA 2727541 A CA2727541 A CA 2727541A CA 2727541 A CA2727541 A CA 2727541A CA 2727541 A1 CA2727541 A1 CA 2727541A1
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Prior art keywords
signal
generating
spreading sequence
constant power
power envelope
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CA2727541A
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French (fr)
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CA2727541C (en
Inventor
David B. Chester
Alan J. Michaels
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Harris Corp
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Harris Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/02Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04Modulator circuits; Transmitter circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/001Modulated-carrier systems using chaotic signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/0007Code type
    • H04J13/0018Chaotic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/10Code generation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/38Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40Transmitting circuits; Receiving circuits
    • H04L25/49Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes

Abstract

Systems (400, 500, 600) and methods (300) for generating a chaotic amplitude modulated signal absent of cyclostationary features by preserving a constant variance. The methods involve: generating a PAM signal including pulse amplitude modulation having a periodically changing amplitude; generating a first part of a constant power envelope signal (FPCPES) by dividing the PAM signal by a square root of a magnitude of the PAM signal; generating a second part of the constant power envelope signal (SPCPES) having a magnitude equal to a square root of one minus the magnitude of the PAM signal; and generating first and second spreading sequences (FSS and SSS). The methods also involve combining the FPCPES with the FSS to generate a first product signal (FPS) and combining the SPCPES with the SSS to generate a second product signal (SPS). A constant power envelope signal is generated using the FPS and SPS.

Claims (11)

1. A method for generating a chaotic amplitude modulated signal absent of cyclostationary features by preserving a constant variance, comprising the steps of:
generating a PAM signal including pulse amplitude modulation having a periodically changing amplitude (304);
generating a first part of a constant power envelope signal, referred to hereinafter as FPCPES, by dividing said PAM signal by a square root of a magnitude of said PAM signal (306);
generating a second part of said constant power envelope signal, referred to hereinafter as SPCPES, having a magnitude equal to a square root of one minus said magnitude of said PAM signal (308);
generating first and second spreading sequences formed as sequences of random values;
combining said FPCPES with said first spreading sequence to generate a first product signal;
combining said SPCPES with said second spreading sequence to generate a second product signal (314); and generating a constant power envelope signal using said first and second product signals (316).
2. The method according to claim 1, further comprising the step of selecting each of said first and second spreading sequences to be orthogonal chaotic sequences.
3. The method according to claim 1, further comprising the step of generating said PAM signal using discrete time baseband modulation to form AM symbols.
4. The method according to claim 1, further comprising the steps of:
transmitting said constant power envelope signal over a communication link to a receiver;
generating at the receiver a third spreading sequence which is identical to said first spreading sequence; and correlating said constant power envelope signal with said third spreading sequence to recover said PAM signal.
5. The method according to claim 4, further comprising the steps of:
generating at said receiver a fourth spreading sequence which is identical to said second spreading sequence; and correlating said constant power envelope signal with said fourth spreading sequence to recover said SPCPES.
6. A system for generating a chaotic amplitude modulated signal absent of cyclostationary features by preserving a constant variance, comprising:
a first generator (402, 404) configured for generating a PAM signal including pulse amplitude modulation having a periodically changing amplitude;
a second generator configured for generating a first part of a constant power envelope signal, referred to hereinafter as FPCPES, by dividing said PAM
signal by a square root of a magnitude of said PAM signal;
a third generator configured for generating a second part of said constant power envelope signal, referred to hereinafter as SPCPES, having a magnitude equal to a square root of one minus said magnitude of said PAM signal;
a fourth generator (410) configured for generating first and second spreading sequences formed as a sequence of random values;
a first combiner configured for combining said FPCPES with said first spreading sequence to generate a first product signal;
a second combiner configured for combining said SPCPES with said second spreading sequence to generate a second product signal; and a fifth generator (416) configured for generating a constant power envelope signal using said first and second product signals.
7. The system according to claim 6, wherein each of said first and second spreading sequences are orthogonal chaotic sequences.
8. The system according to claim 6, wherein said PAM signal is generated using discrete time baseband modulation to form AM symbols.
9. The system according to claim 6, further comprising a transmitter configured for transmitting said constant power envelope signal to a receiver over a communications link.
10. The system according to claim 9, wherein said receiver is configured for generating a third spreading sequence which is identical to said first spreading sequence and correlating said constant power envelope signal with said third spreading sequence to recover said PAM signal.
11. The system according to claim 9, wherein said receiver is configured for generating a fourth spreading sequence which is identical to said second spreading sequence and correlating said constant power envelope signal with said third spreading sequence to recover said SPCPES.
CA2727541A 2008-06-12 2009-06-11 Featureless coherent chaotic amplitude modulation Expired - Fee Related CA2727541C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12/137,593 US8068571B2 (en) 2008-06-12 2008-06-12 Featureless coherent chaotic amplitude modulation
US12/137,593 2008-06-12
PCT/US2009/046990 WO2009152295A1 (en) 2008-06-12 2009-06-11 Featureless coherent chaotic amplitude modulation

Publications (2)

Publication Number Publication Date
CA2727541A1 true CA2727541A1 (en) 2009-12-17
CA2727541C CA2727541C (en) 2012-11-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2727541A Expired - Fee Related CA2727541C (en) 2008-06-12 2009-06-11 Featureless coherent chaotic amplitude modulation

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US (1) US8068571B2 (en)
EP (1) EP2289212B1 (en)
JP (1) JP5179656B2 (en)
KR (1) KR101226327B1 (en)
CA (1) CA2727541C (en)
WO (1) WO2009152295A1 (en)

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US8068571B2 (en) 2011-11-29
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EP2289212A1 (en) 2011-03-02
US20090310650A1 (en) 2009-12-17

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