Method and apparatus for communicating data in a digital chaos communication system
View Patent ↗The present invention teaches method and apparatus to transform a featureless, unpredictable, and non-repeatable chaos waveform into digital chaos waveforms that maintain featureless characteristics to serve as a for wireless communications protocol, whereby unintended observers cannot detect or disrupt yet imprint a small measure of predictability and repeatability to aid intend observers in recovering embedded information.
1. A method of embedding a data signal in a wireless transmission using a digital chaos sequenced spreading code, comprising:
a. recording a featureless communication waveform having nonlinear dynamics;
b. buffering said featureless communication waveform into distinct segments;
c. sampling said distinct segments to ensure low cross-correlation amongst said samples of distinct segments;
d. grouping samples of said distinct segments at a predefined length and variable quantity;
e. processing at least one group of said group of sampled distinct segments using Gram-Schmidt processing;
f. storing said Gram-Schmidt processed group in a first non-transitory computer readable storage medium;
h. reading out said stored Gram-Schmidt processed group from said first non-transitory computer readable storage medium;
i. spreading said data signal using said read out Gram-Schmidt processed group as a spreading code to create a spreaded data signal;
j. modulating said spreaded data signal; and
k. and transmitting said modulated spreaded data signal.
2. A method according to claim 1 further comprising:
l. storing a copy of said Gram-Schmidt processed group in a second non-transitory computer readable storage medium;
m. demodulating said modulated spreaded data signal to recover said spreaded data signal;
n. reading said copy of said Gram-Schmidt processed group out of said second non-transitory computer readable storage medium; and
o. despreading said spreaded data signal using said read out copy of said Gram-Schmidt processed group as a dispreading code to recover said data signal.
3. A method according to claim 1 , wherein the featureless communication waveform is one of at least one of a native analog chaos waveform, a period waveform, computer simulated non-linear dynamics of a deterministic mapping characteristic, or stochastic mapping characteristic.
4. The method according to claim 1 , further including placing control bits in a pre-amble and a mid-amble of said modulated spreaded data signal.
5. A method for recovering a data signal using a digital chaos sequence spreading code, comprising:
a. recording a featureless communication waveform having nonlinear dynamics;
b. buffering said featureless communication waveform into distinct segments;
c. sampling said distinct segments to ensure low cross-correlation amongst said samples of distinct segments;
d. grouping samples of said distinct segments at a predefined length and variable quantity;
e. processing at least one group of said group of sampled distinct segments using Gram-Schmidt processing;
f. storing said Gram-Schmidt processed group in a first non-transitory computer readable storage medium;
g. reading out said stored Gram-Schmidt processed group from said first non-transitory computer readable storage medium;
h. despreading said data signal using said read out Gram-Schmidt processed group as a despreading code to create a despreaded data signal; and
i. demodulating said despreaded data signal to recover said data signal.
6. A method according to claim 5 , wherein the featureless communication waveform is one of at least one of a native analog chaos waveform, aperiodic waveform, and computer simulated non-linear dynamics of a deterministic mapping characteristic.
7. A method according to claim 5 , wherein the recovered data signal further includes control bits modulated in a pre-amble and a mid-amble of said digital chaos sequence at a transmit side.
8. A method of using a digital chaos sequence spreading code for a data source, comprising:
a. recording a featureless communication waveform having nonlinear dynamics;
b. buffering said featureless communication waveform into distinct segments;
c. sampling said distinct segments to ensure low cross-correlation amongst said samples of distinct segments;
d. grouping samples of said distinct segments at a predefined length and variable quantity;
e. converting at least one of said grouped samples of said distinct segments into a group of orthonormal sequences spanning the same subspace as said at least one of said grouped samples;
f. storing said group of orthonormal sequences in a non-transitory computer readable storage medium;
h. reading out said group of orthonormal sequences from said non-transitory computer readable storage medium;
i. spreading said data source using said read out group of orthonormal sequences as a spreading code to create a spreaded data source;
j. modulating said spreaded data source; and
k. and transmitting said modulated spreaded data source.
9. A method of claim 8 , wherein said featureless communication waveform is one of at least a native analog chaos waveform, a period waveform, computer simulated non-linear dynamics of a deterministic mapping characteristic, or stochastic mapping characteristic.
10. A method according to claim 8 , further including placing control bits in a pre-amble and a mid-amble of said modulated spreaded data source.