Private, convert and/or cognitive communications systems and/or methods based upon pseudo-randomly generated communications alphabets

• US 20110103437A1
• Filed: 12/23/2010
• Published: 05/05/2011
• Est. Priority Date: 06/22/2005
• Status: Active Grant

• Current Assignee: Odyssey Wireless, Inc.
• Original Assignee: Odyssey Wireless, Inc.
• Inventors: Karabinis, Peter D.
• Granted Patent: US 8,537,910 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04K 3/25 based on characteristics of target signal or of transmission as countermeasure against surveillance H04K3/827, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04K 3/827 using characteristics of target signal or of transmission as countermeasure against jamming H04K3/25, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling

Abstract

An available signal space, whether it is a priori specified or is cognitively determined based upon an assessment of frequency utilization, serves to provide a number of signal dimensions which may be occupied by a number of pseudo-randomly generated waveforms. The number of pseudo-randomly generated waveforms may be based upon a key input to a pseudo-random number generator and a desired statistical distribution, and may be subjected to an orthogonalization procedure to produce a respective number of orthogonal pseudo-random waveforms which may serve as a communications alphabet. A specific data sequence to be communicated may be associated with a respective specific element/member of the orthogonal pseudo-random waveforms and that specific element/member may be transmitted in lieu of the specific data sequence. Systems/methods of spread-spectrum communications that are substationally devoid of revealing signatures such as chipping and cyclostationarity are presented, offering increased privacy, reduced detectability and reduced exploitation of communications.

Claims

1. A wireless communications device comprising:

a transmitter and/or a receiver; and

a processor that is configured to pseudo-randomly generate a communications alphabet comprising a plurality of waveform elements;

wherein the processor is further configured to use the communications alphabet that is pseudo-randomly generated and comprises the plurality of waveform elements to transmit and/or receive information via the transmitter and/or the receiver.

2. The wireless communications device according to claim 1, wherein the processor is further configured to pseudo-randomly generate the communications alphabet that comprises the plurality of waveform elements responsive to a statistical distribution and responsive to an orthogonalization procedure;

wherein at least two waveform elements of the plurality of waveform elements are orthogonal therebetween over a signaling interval; and

wherein at least one of the waveform elements of the plurality of waveform elements is pseudo-randomly generated by the processor responsive to said statistical distribution.

3. The wireless communications device according to claim 1, wherein the processor is further configured to generate the communications alphabet such that a frequency-domain representation thereof comprises an amplitude that is greater than a threshold over a first frequency interval and is also greater than the threshold over a second frequency interval that is non-contiguous with the first frequency interval and wherein the amplitude of the frequency-domain representation is less than the threshold over a third frequency interval that is between the first and second frequency intervals.

4. The wireless communications device according to claim 1, wherein the processor is further configured to generate the communications alphabet responsive to a key and/or Time-of-Day value.

5. The wireless communications device according to claim 1, wherein the processor is further configured to use the communications alphabet that is pseudo-randomly generated and comprises the plurality of waveform elements to transmit and/or receive information that is devoid of chipping and/or cyclostationarity via the transmitter and/or the receiver.

6. The wireless communications device according to claim 1, wherein the processor is further configured to:

generate pseudo-randomly a plurality of communications alphabets each comprising a plurality of waveform elements;

use a first communications alphabet of the plurality of communications alphabets to process first data; and

use a second communications alphabet of the plurality of communications alphabets to process second data;

wherein the first communications alphabet and the second communications alphabet differ therebetween.

7. The wireless communications device according to claim 1, wherein the processor is further configured to:

generate pseudo-randomly a plurality of communications alphabets each comprising a plurality of waveform elements;

use a first communications alphabet of the plurality of communications alphabets to process data; and

use a second communications alphabet of the plurality of communications alphabets to process the data;

wherein the first communications alphabet and the second communications alphabet differ therebetween.

8. The wireless communications device according to claim 2, wherein the statistical distribution is truncated.

9. The wireless communications device according to claim 3, wherein said frequency-domain representation comprises a first plurality of frequencies over a first time interval and a second plurality of frequencies over a second time interval;

wherein the first plurality of frequencies differs from the second plurality of frequencies in at least one frequency.

10. The wireless communications device according to claim 1, wherein the processor is further configured to use the communications alphabet to transmit and/or receive information via the transmitter and/or the receiver without resorting to a modulation of a carrier frequency;

and

wherein the processor is configured to transmit and/or receive information via the transmitter and/or the receiver without resorting to a frequency translation of the information to be transmitted, of the information that is received and/or of any waveform element of the communications alphabet.

11. A communications method comprising:

pseudo-randomly generating a communications alphabet comprising a plurality of waveform elements; and

transmitting and/or receiving information using the communications alphabet that is pseudo-randomly generated and comprises the plurality of waveform elements.

12. The method according to claim 11, wherein said pseudo-randomly generating comprises pseudo-randomly generating responsive to a statistical distribution and wherein the method further comprises orthogonalizing responsive to an orthogonalization procedure;

wherein said orthogonalizing comprises orthogonalizing at least two waveform elements of the plurality of waveform elements over a signaling interval; and

wherein said pseudo-randomly generating responsive to a statistical distribution comprises pseudo-randomly generating at least one of the waveform elements of the plurality of waveform elements responsive to said statistical distribution.

13. The method according to claim 11, further comprising:

generating the communications alphabet such that a frequency-domain representation thereof comprises an amplitude that is greater than a threshold over a first frequency interval and is also greater than the threshold over a second frequency interval that is non-contiguous with the first frequency interval and wherein the amplitude of the frequency-domain representation is less than the threshold over a third frequency interval that is between the first and second frequency intervals.

14. The method according to claim 11, further comprising:

generating the communications alphabet responsive to a key and/or Time-of-Day value.

15. The method according to claim 11, further comprising:

transmitting and/or receiving information that is devoid of chipping and/or cyclostationarity.

16. The method according to claim 11, further comprising:

generating pseudo-randomly a plurality of communications alphabets each comprising a plurality of waveform elements;

processing first data by using a first communications alphabet of the plurality of communications alphabets; and

processing second data by using a second communications alphabet of the plurality of communications alphabets;

wherein the first communications alphabet and the second communications alphabet differ therebetween.

17. The method according to claim 11, further comprising:

generating pseudo-randomly a plurality of communications alphabets each comprising a plurality of waveform elements;

processing data by using a first communications alphabet of the plurality of communications alphabets; and

processing the data by using a second communications alphabet of the plurality of communications alphabets;

wherein the first communications alphabet and the second communications alphabet differ therebetween.

18. The method according to claim 12, further comprising:

truncating said statistical distribution and wherein pseudo-randomly generating responsive to a statistical distribution comprises pseudo-randomly generating responsive to the truncated statistical distribution.

19. The method according to claim 13, wherein said frequency-domain representation comprises a first plurality of frequencies over a first time interval and a second plurality of frequencies over a second time interval;

wherein the first plurality of frequencies differs from the second plurality of frequencies in at least one frequency.

20. The method according to claim 11, wherein said transmitting and/or receiving information is devoid of a modulation of a carrier frequency and is devoid of a frequency translation of the information to be transmitted, of the information that is received and/or of any waveform element of the communications alphabet.

21. The method according to claim 11, wherein said transmitting and/or receiving comprises wirelessly transmitting and/or receiving.