Narrow band chaotic frequency shift keying

• US 7,142,617 B2
• Filed: 05/17/2003
• Issued: 11/28/2006
• Est. Priority Date: 05/24/2001
• Status: Expired due to Term

• Current Assignee: Magnolia Licensing LLC (IP Edge LLC)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Mohan, Chandra
• Primary Examiner(s): Bayard, Emmanuel
• Assistant Examiner(s): Williams, Lawrence B.
• Application Number:
  US10/478,950
• Publication Number:
  US 20040165681A1
• Time in Patent Office: 1,291 Days
• Field of Search: 375/130, 375/133, 375/234, 375/285, 375295-296, 375/346, 375/366, 380/263, 380/274, 380/28, 380/34, 380/44, 380/46, 706/17, 708/250, 331/78
• US Class Current: 375/323
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 27/001 using chaotic signals for secret or secure communication H04L9/001

Abstract

A system and method for signal transmission and reception by narrow band chaotic frequency shift keying includes a forward error correction encoder for receiving input data, a data packetizer in signal communication with the forward error correction encoder, a compression encoder in signal communication with the data packetizer, a radio frequency link in signal communication with the compression encoder, a compression decoder in signal communication with the radio frequency link, a data depacketizer in signal communication with the compression decoder, and a forward error correction decoder in signal communication with the data depacketizer for recovering the input data by controlling the orbits of chaos; where the method includes the steps of transmitting a signal indicative of chaotic frequency shift keyed data, propagating the transmitted signal within a narrow frequency band, and receiving the propagated signal substantially without degradation of the indicated data by controlling the orbits of chaos.

Claims

1. A method for signal transmission comprising:

transmitting a signal indicative of chaotic frequency shift keyed data, said transmitting including providing input data;

encoding the provided data for forward error correction, and for controlling orbits of chaos;

packetizing the encoded data for modulation; and

propagating the transmitted signal within a narrow frequency band so that the propagated signal is received substantially without degradation of the indicated data.

2. A method as defined in claim 1 wherein the narrow frequency band comprises a radio frequency band of less than about 10 kHz bandwidth.

3. A method as defined in claim 1 wherein the signal indicative of chaotic frequency shift keyed data is an intermediate frequency signal.

4. A method as defined in claim 1 wherein said encoding comprises modulating a composite information and chaos signal onto a carrier signal by frequency shift keying to form the chaotic frequency shift keyed data.

5. A method as defined in claim 1 wherein said encoding comprises deriving a chaos signal by frequency shift keying in accordance with a non-linear mapping function that exhibits flow.

6. A method comprising:

receiving a transmitted signal indicative of chaotic frequency shift keyed data substantially without degradation of the indicated data by controlling orbits of chaos, the transmitted signal being propagated within a narrow frequency band, and the receiving including;

decompressing the data indicated by the propagated signal;

de-packetizing the decompressed data; and

decoding the de-packetized data to output data substantially without degradation from the transmitted data.

7. A method as defined in claim 6 wherein said decoding comprises demodulating a composite information and chaos signal from a carrier signal by high-speed detection to substantially recover the transmitted data.

8. A method as defined in claim 6 wherein the signal indicative of chaotic frequency shift keyed data is responsive to chaos generation using a non-linear operation of a Colpitts oscillator driven by a non-linear mapping function to aid synchronization between transmitting and receiving.

9. A method as defined in claim 6 wherein said decoding comprises deriving a chaos signal by at least one of a phase comparison and a frequency comparison in accordance with a non-linear mapping function that exhibits flow.

10. A method as defined in claim 9 wherein said decoding further comprises generating an exact replica of a transmitter map for comparison in accordance with said at least one of a phase comparison and a frequency comparison;

and generating an error signal for correction.

11. A method for signal transmission comprising:

transmitting a signal indicative of chaotic frequency shift keyed data, said transmitting including providing input data;

encoding the provided data to generate a tent map of possible orbits of chaos to stay within a bounded state-space region;

packetizing the encoded data for modulation; and

propagating the transmitted signal within a narrow frequency band so that the propagated signal is received substantially without degradation of the indicated data by controlling orbits of chaos.