Claims
- 1. A method for acquiring a received impulse radio signal, comprising:
searching, with respect to time, a region of the impulse radio signal using a first template signal to locate a block including a signal cell; and searching, with respect to time, the block using a second template signal to locate the signal cell to acquire the received impulse radio signal.
- 2. The method of claim 1 wherein the impulse radio signal is a random-code division multiple access radio signal.
- 3. The method of claim 1 wherein the impulse radio signal is an ultra-wide-bandwidth radio signal.
- 4. The method of claim 1 wherein the impulse radio signal is a direct sequence-code division multiple access radio signal.
- 5. The method of claim 1 wherein the impulse radio signal is a direct binary phase-shift keyed random time hopping radio signal.
- 6. The method of claim further comprising:
wherein a first correlation interval associated with the first template signal is substantially longer than a second correlation interval associated with the second template signal.
- 7. The method of claim 5 wherein the searching further comprises:
time shifting the first and second template signals while searching; correlating the shifted first and second template signals over the first and second correlation intervals to determine first and second outputs, respectively; and comparing the first and second outputs to first and second thresholds to locate the block and signal cell, respectively.
- 8. The method of claim 1 wherein a transmitted impulse radio signal corresponding to the received impulse radio signal is represented by
- 9. The method of claim 8 wherein the first template signal is expressed as
- 10. The method of claim 8 wherein the second template signal is expressed as
- 11. The method of claim 1 wherein the searching of the region uses a block threshold, τb, and the searching of the block uses a signal threshold τs.
- 12. A system for acquiring a received impulse radio signal, comprising:
first means for searching, with respect to time, a region of the impulse radio signal using a first template signal to locate a block including a signal cell; and second means for searching, with respect to time, the block using a second template signal to locate the signal cell to acquire the received impulse radio signal.
- 13. An apparatus for acquiring a received impulse radio signal, comprising:
a correlation unit configured to search, with respect to time, a region of the impulse radio signal using a first template signal to locate a block including a signal cell, and to search, with respect to time, the block using a second template signal to locate the signal cell to acquire the received impulse radio signal; a synchronization unit to time-shift the first and second template signals while searching; and a decision unit to compare first and second outputs of the correlation unit to first and second thresholds while searching the region and block respectively.
CROSS REFERENCE TO RELATED APPLICATION
[0001] A claim of priority is made to U.S. provisional application serial No. 60/451,442, “Method and Apparatus for Rapid Signal Acquisition in Ultra Wideband Communications Systems,” filed Mar. 3, 2003.
Provisional Applications (1)
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Number |
Date |
Country |
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60451442 |
Mar 2003 |
US |