CA2727541A1 - Featureless coherent chaotic amplitude modulation - Google Patents
Featureless coherent chaotic amplitude modulation Download PDFInfo
- 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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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/001—Modulated-carrier systems using chaotic signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0018—Chaotic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting 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
- H04L25/4917—Transmitting 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).
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.
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.
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.
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.
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 |
Family
ID=40902120
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 |
Country Status (6)
Country | Link |
---|---|
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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WO2009152295A1 (en) | 2009-12-17 |
CA2727541C (en) | 2012-11-27 |
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EP2289212B1 (en) | 2014-03-12 |
EP2289212A1 (en) | 2011-03-02 |
US20090310650A1 (en) | 2009-12-17 |
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