Featureless coherent chaotic amplitude modulation
First Claim
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;
generating a first part of a constant power envelope signal (FPCPES) by dividing said PAM signal by a square root of a magnitude of said PAM signal;
generating a second part of said constant power envelope signal (SPCPES)having a magnitude equal to a square root of one minus said magnitude of said PAM signal;
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; and
generating a constant power envelope signal using said first and second product signals.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
23 Claims
-
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; generating a first part of a constant power envelope signal (FPCPES) by dividing said PAM signal by a square root of a magnitude of said PAM signal; generating a second part of said constant power envelope signal (SPCPES)having a magnitude equal to a square root of one minus said magnitude of said PAM signal; 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; and generating a constant power envelope signal using said first and second product signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for generating a coherent communication signal, comprising the steps of:
-
generating a first baseband pulse amplitude modulated signal; generating a second baseband pulse amplitude modulated signal such that said first and second baseband pulse amplitude modulated signals generate output signals with variances that are compliments of each other; computing a plurality of first square root values by taking the square roots of each of a plurality of magnitude values of said first baseband pulse amplitude modulated signal; computing a plurality of second square root values by taking the square roots of each of a plurality of magnitude values of said second baseband pulse amplitude modulated signal; generating first and second spreading sequences formed as sequences of random values; combining each square root value of said plurality of first square root values with a respective random number of said first spreading sequence to generate a first spread spectrum signal; combining each square root value of said plurality of second square root values with respective random numbers of said second spreading sequence to generate a second spread spectrum signal; and combining said first spread spectrum signal and said second spread spectrum signal to form a composite spread signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
-
-
16. A system, comprising:
-
a first generator 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 (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 (SPCPES) having a magnitude equal to a square root of one minus said magnitude of said PAM signal; a fourth generator 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 configured for generating a constant power envelope signal using said first and second product signals. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
-
Specification