Ultra-wide band communication system and method

• US 6,668,008 B1
• Filed: 06/06/2000
• Issued: 12/23/2003
• Est. Priority Date: 06/06/2000
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Panasik, Carl M.
• Primary Examiner(s): Le, Amanda T.
• Application Number:
  US09/588,086
• Time in Patent Office: 1,295 Days
• Field of Search: 375/130, 375/139, 375/140, 375/146, 375/296, 375/295, 342/82, 342/202, 455/63
• US Class Current: 375/139
• CPC Class Codes: H04B 7/2603 Arrangements for wireless physical layer control H04B7/2612 takes precedence

Abstract

A system and method for generating an ultra-wide band communication signal having data occurring a specific frequencies precisely excised at baseband. The data to be transmitted is transformed into a function of time where the data to be excised can be removed in the time domain. After the data has been successfully removed in the time domain, the data is then transmitted in the frequency domain in which no data is transmitted at the frequencies where the data was precisely excised.

Claims

1. A method for generating ultra-wide band communication signals comprising the steps of:

(a) generating a baseband signal in the frequency domain;

(b) processing the baseband signal to generate an ultra-wide baseband signal having a desired bandwidth in which frequency is a function of time; and

(c) notching the ultra-wide baseband signal in the time domain to generate an ultra-wide band communication signal having desired signal frequencies precisely excised from the expanded baseband signal.

2. The method according to claim 1 wherein the step of processing the baseband signal comprises expanding the baseband signal.

3. The method according to claim 1 wherein the step of processing the baseband signal comprises spreading the baseband signal.

4. The method according to claim 1 wherein the step of notching the ultra-wide baseband signal comprises generating a desired time domain waveform.

5. The method according to claim 4 wherein the step of notching the ultra-wide baseband signal further comprises synchronizing the desired time domain waveform with the ultra-wide baseband signal.

6. The method according to claim 5 wherein the step of notching the ultra-wide baseband signal further comprises multiplying the synchronized desired time domain waveform by the ultra-wide baseband signal.

7. The method according to claim 1 wherein the step of notching the ultra-wide baseband signal comprises switching the ultra-wide baseband signal off and on at desired times such that baseband signal frequencies occurring at specific times are precisely excised from the expanded baseband signal.

8. An ultra-wide band communication system comprising:

a baseband communication signal transmitter configured for generating a baseband signal in the frequency domain, the transmitter having a first signal processor configured to process the baseband signal to generate an ultra-wide baseband signal having a desired bandwidth in which frequency is a function of time, the transmitter further having a second signal processor configured for notching the ultra-wide baseband signal in the time domain to generate an ultra-wide band communication signal having desired signal frequencies precisely excised from the expanded baseband signal.

9. The ultra-wide band communication system according to claim 8 wherein the first signal processor is an expander.

10. The ultra-wide band communication system according to claim 8 wherein the first signal processor is a spreader.

11. The ultra-wide band communication system according to claim 8 wherein the second signal processor comprises a time domain signal generator.

12. The ultra-wide band communication system according to claim 11 wherein the second signal processor further comprises a synchronizer.

13. The ultra-wide band communication system according to claim 12 wherein the second signal processor further comprises a mixer configured to multiply an expanded baseband signal by a time domain signal that is synchronized with the expanded baseband signal.

14. The ultra-wide band communication system according to claim 8 wherein the second signal processor comprises a switching device configured to switch an expanded baseband signal on and off at specific times such that specific frequencies associated with specific off times are precisely excised from the expanded baseband signal to generate a desired ultra-wide baseband communication signal.

15. A method of generating an ultra-wide band communication signal comprising the steps of:

(a) generating a first stream of data within a band of frequencies;

(b) expanding the first stream of data to generate a second stream of data in which data generated at each frequency within the band of frequencies is uniquely associated with a specific unit of time; and

(c) notching the second stream of data at desired units of time to precisely excise data at specific frequencies necessary to generate a desired ultra-wide band communication signal.

16. The method according to claim 15 wherein the step of notching comprises generating a time domain signal.

17. The method according to claim 16 wherein the step of notching further comprises synchronizing the time domain signal with the second stream of data.

18. The method according to claim 17 wherein the step of notching further comprises mixing the synchronized time domain signal with the synchronized second stream of data.

19. The method according to claim 15 wherein the step of notching comprises switching the second stream of data on and off at specific times.

20. A method of generating an ultra-wide band communication signal comprising the steps of:

(d) generating a first stream of data within a band of frequencies;

(e) spreading the first stream of data to generate a second stream of data in which data generated at each frequency within the band of frequencies is uniquely associated with a specific unit of time; and

(f) notching the second stream of data at desired units of time to precisely excise data at specific frequencies necessary to generate a desired ultra-wide band communication signal.

21. The method according to claim 20 wherein the step of notching comprises generating a time domain signal.

22. The method according to claim 21 wherein the step of notching further comprises synchronizing the time domain signal with the second stream of data.

23. The method according to claim 22 wherein the step of notching further comprises mixing the synchronized time domain signal with the synchronized second stream of data.

24. The method according to claim 20 wherein the step of notching comprises switching the second stream of data on and off at specific times.

25. A system for generating an ultra-wide band communication signal, the system comprising:

means for generating a second stream of data within a second band of frequencies from a first stream of data within a first band of frequencies such that the second stream of data is generated over a wider band of frequencies than that occupied by the first stream of data and further such that each frequency associated with the second stream of data is associated with a unique unit of time; and

means for notching the second stream of data at specific units of time to generate an ultra-wide band communication signal in which data generated at specific frequencies within the second band of frequencies is precisely excised from the second stream of data.

26. The system according to claim 25 wherein the means for generating a second stream of data comprises an expander.

27. The system according to claim 25 wherein the means for generating a second stream of data comprises a spreader.

28. The system according to claim 25 wherein the means for notching comprises means for generating a time domain signal.

29. The system according to claim 28 wherein the means for notching further comprises means for synchronizing the time domain signal with the second stream of data.

30. The system according to claim 29 wherein the means for notching further comprises means for mixing the synchronized time domain signal with the synchronized second stream of data.

31. The system according to claim 25 wherein the means for notching comprises a switching device configured to switch the second stream of data on and off during specific units of time.