Spread-spectrum identification signal for communications system

• US 4,943,973 A
• Filed: 03/31/1989
• Issued: 07/24/1990
• Est. Priority Date: 03/31/1989
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.), AT&T Information Systems Inc. (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Werner, Jean-Jacques
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US07/331,933
• Time in Patent Office: 480 Days
• Field of Search: 375/1, 342/13, 342/457
• US Class Current: 375/141
• CPC Class Codes: H04B 1/707 using direct sequence modulation

Abstract

A spread-spectrum signal which conveys identifying information for an associated information signal is superimposed on the associated signal and transmitted therewith. Such identifying information distinguishes between voice and data information signals and between different types of data information signals. Such identification can be used for a variety of purposes within a communications network, such as facility and equipment selection, equipment disablement and bypass, setting communications parameters, e.g., speed, and inhibiting communications upon fault detection.

Claims

1. A communications system comprising

means for transmitting a spread-spectrum signature signal superimposed upon an associated nonspread-spectrum information signal, said spread-spectrum signal conveying information which identifies the associated information signal;

means for receiving said information signal and superimposed spread-spectrum signature signal; and

means responsive to the received spread-spectrum signature signal for recovering the identifying information.

2. The communications system of claim 1 wherein said recovering means also includes means for assigning said associated information signal to one of a plurality of communications modes in response to the identifying information recovered from said spread-spectrum signature signal.

3. The system of claim 2 wherein said assigning means routes said associated information signal to one of a plurality of communications facilities.

4. The system of claim 2 wherein said assigning means causes said associated information signal to bypass predetermined communications apparatus.

5. The system of claim 2 wherein said assigning means selectively disables at least one of a plurality of communications apparatus.

6. The system of claim 2 wherein said assigning means maintains a record of the assigned communications mode.

7. The system of claim 2 wherein said assigning means routes said associated information signal to different ones of a plurality of similar communications apparatus.

8. The system of claim 2 wherein said assigning means generates a signal which inhibits future transmission of said associated information signal.

9. The system of claim 2 wherein said assigning means alters an operating characteristic of said receiving means.

10. The system of claim 2 wherein said assigning means also alters an operating characteristic of said transmitting means.

11. The system of claim 2 wherein said operating characteristic is the rate at which said information signal and superimposed spread-spectrum signature signal is transmitted.

12. The system of claim 1 wherein said transmitting means includes means for generating said spread-spectrum signature signal.

13. The system of claim 12 wherein said generating means includes a pseudorandom sequence generator.

14. The system of claim 1 wherein said transmitting means includes means for superimposing said spread-spectrum signature signal upon said associated information signal.

15. The system of claim 1 wherein receiving means includes a random sequence generator.

16. The system of claim 1 wherein said receiving means includes a decision device which compares a signal to a predetermined threshold.

17. The system of claim 1 wherein said transmitting means transmits said associated information signal and superimposed spread-spectrum signature signal as a baseband signal.

18. The system of claim 1 wherein said transmitting means transmits said associated information signal and superimposed spread-spectrum signature signal as a passband signal.

19. A communications method comprising the steps of

transmitting a spread-spectrum signature signal superimposed upon an associated nonspread-spectrum information signal, said spread-spectrum signal conveying information which identifies the associated information signal;

receiving said information signal and superimposed spread-spectrum signature signal; and

recovering the identifying information from the received spread-spectrum signal.

20. A transmitter for a communications system comprising

means for receiving a nonspread-spectrum information signal and generating a spread-spectrum signal conveying information which identifies said information signal, and means responsive to said spread-sprectrum signal and said information signal for superimposing said spread-spectrum signal onto said information signal.

21. A method comprising the steps of

receiving a nonspread-spectrum information signal, generating a spread-spectrum signal conveying information which identifies said information signal, and superimposing said spread-spectrum signal onto said information signal.

22. A receiver for a communications system comprising

means for receiving a nonspread-spectrum information signal and a superimposed spread-spectrum signal, said spread-spectrum signal conveying information which identifies said information signal, and

means responsive to the superimposed spread-spectrum signal for recovering the identifying information therein.

23. A method comprising the steps of

receiving a nonspread-spectrum information signal and a superimposed spread-spectrum signal, said spread-spectrum signal conveying information which identifies said information signal, and

recovering the identifying information in said spread-spectrum signal.