Ultra-wideband synchronization systems and methods

• US 20060045134A1
• Filed: 08/25/2004
• Published: 03/02/2006
• Est. Priority Date: 08/25/2004
• Status: Abandoned Application

• Current Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Original Assignee: Intellectual Ventures Holding 73 LLC (Intellectual Ventures LLC)
• Inventors: Santhoff, John, Moore, Steven, Eldon, John
• Application Number:
  US10/925,469
• Publication Number:
  US 20060045134A1
• Time in Patent Office: Days
• US Class Current: 370/503
• CPC Class Codes: H04B 1/7183 Synchronisation
• CPC Class Codes: H04J 3/0655 using timestamps
• CPC Class Codes: H04J 3/0664 unidirectional timestamps

Abstract

The present invention provides systems and methods for ultra-wideband communication devices to maintain synchronization. One embodiment of the present invention provides a method by which ultra-wideband communication devices may update their timing references by the use of a statistics register. In another embodiment, a network of ultra-wideband communication devices uses the statistics registers of a plurality of ultra-wideband devices to update their timing references based on calculating a function. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Claims

1. A method of synchronization comprising the steps of:

transmitting an ultra-wideband signal comprising a synchronization sequence from a first device having a first timing reference;

receiving the ultra-wideband signal at a second device having a second timing reference;

synchronizing the second timing reference to the first timing reference based on the time of receipt of the synchronization sequence; and

updating a statistics register on the second device with the time of arrival of the synchronization sequence.

2. The method of claim 1, further comprising the step of calculating a function from the statistics register.

3. The method of claim 2, wherein the function is selected from a group consisting of:

a mean function, a median function, a rate of change function, and a sum function.

4. The method of claim 1, further comprising the step of communicating the contents of the statistics register to the first device.

5. The method of claim 1, further comprising the step of adjusting the first timing reference based on the contents of the statistics register.

6. The method of claim 1, further comprising the step of adjusting the second timing reference based on the contents of the statistics register.

7. The method of claim 1, wherein the synchronization sequence is transmitted using at least one discrete pulse of electromagnetic energy.

8. The method of claim 7, wherein the at least one discrete pulse of electromagnetic energy has a duration that can range from between about 10 picoseconds to about 1 microsecond.

9. The method of claim 7, wherein the at least one discrete pulse of electromagnetic energy has a power that can range from between about +30 dBm to about −

60 dBm, as measured at a single frequency.

10. A communication network, comprising:

a first device transmitting an ultra-wideband signal; and

at least two receiving devices receiving the ultra-wideband signal, with each of the at least two receiving devices transmitting a statistics register to the first device;

wherein the first device calculates a timing reference adjustment from the received statistics registers.

11. The communication network of claim 10, wherein the calculation of a timing reference adjustment further comprises weighting a contents of each statistics register by a parameter and calculating a function on the weighted statistics.

12. The communication network of claim 11, wherein the parameter is related to a data rate required by at least one of the at least two receiving devices.

13. The communication network of claim 11, wherein the parameter is related to a distance between at least one of the receiving devices and the first device.

14. The communication network of claim 11, wherein the parameter is related to a quality of service requirement of at least one of the receiving devices.

15. The communication network of claim 11, wherein the function is selected from a group consisting of:

a mean function, a median function, a rate of change function, and a sum function.

16. The communication network of claim 10, wherein the first device makes an adjustment to its timing reference based on the calculated timing reference adjustment.

17. The communication network of claim 10, wherein the ultra-wideband signal is transmitted using at least one discrete pulse of electromagnetic energy.

18. The communication network of claim 17, wherein the at least one discrete electromagnetic pulse has a duration that can range from between about 10 picoseconds to about 1 microsecond.

19. The communications network of claim 18, wherein the at least one discrete electromagnetic pulse has a power that can range between about +30 dBm to about −

60 dBm, as measured at a single frequency.

20. A method of synchronization comprising the steps of:

transmitting an ultra-wideband signal comprising a synchronization sequence from a first device having a first timing reference;

receiving the ultra-wideband signal at a second device having a second timing reference;

adjusting the second timing reference using the synchronization sequence; and

adjusting the second timing reference before receiving another synchronization sequence.

21. The method of claim 20, wherein the adjustment of the timing reference is done on a pulse-to-pulse basis.

22. The method of claim 20, wherein the adjustment of the timing reference is done on a greater than a pulse-to-pulse basis.

23. The method of claim 20, wherein the adjustment of the timing reference is done in response to exceeding a threshold in timing reference drift.

24. The method of claim 20, further comprising updating a statistics register on the second device and wherein the adjustment of the timing reference is based on calculating a function where the contents of the statistics register is an input to the function.

25. The method of claim 24, wherein the function is selected from a group consisting of:

a mean function, a median function, a rate of change function, and a sum function.

26. The method of claim 20, wherein the ultra-wideband signal is transmitted using at least one discrete pulse of electromagnetic energy.

27. The method of claim 26, wherein the least one discrete electromagnetic pulse has a duration that can range from between about 10 picoseconds to about 1 microsecond.

28. The method of claim 26, wherein the at least one discrete electromagnetic pulse has a power that can range from between about +30 dBm to about −

60 dBm, as measured at a single frequency.