Time-tracking for clustered demodulation elements in a spread spectrum system
First Claim
Patent Images
1. A wireless communication device comprising:
- a searcher that generates a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength;
a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; and
a controller that adds a virtual path to the list of paths based on a comparison of the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths,wherein the virtual path is associated with a corresponding time offset and signal strength, which do not equal the time offset and signal strength of any one of the plurality of demodulation elements.
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Abstract
An apparatus, such as a subscriber unit or a base station within a spread spectrum communication system, provides advanced control over the time-tracking of demodulation elements when unresolvable multipath situations arise. The apparatus provides merge protection that prevents clustered demodulation elements from contracting beyond a minimum time span. In addition, the apparatus provides a master/slave feature for synchronizing the time-tracking of the demodulation elements when clustered around a multipath signal.
8 Citations
19 Claims
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1. A wireless communication device comprising:
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a searcher that generates a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; and a controller that adds a virtual path to the list of paths based on a comparison of the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths, wherein the virtual path is associated with a corresponding time offset and signal strength, which do not equal the time offset and signal strength of any one of the plurality of demodulation elements. - View Dependent Claims (2, 3)
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4. A wireless communication device comprising:
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a searcher that generates a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; and a controller that adds a virtual path to the list of paths based on a comparison of the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths, wherein the controller replaces a first path from the list of paths with a replacement path having a first time offset and a first signal strength associated with a first demodulation element based on a comparison of the first path and the first demodulation element, and wherein the controller places the virtual path at a second time period and a second signal strength relative to the replacement path.
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5. A wireless communication device comprising:
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a searcher that generates a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; and a controller that adds a virtual path to the list of paths based on a comparison of the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths, wherein the controller adds the virtual path if not more than one path from the list of paths is within a determined time period from a cluster of demodulations elements selected from the plurality of demodulation elements. - View Dependent Claims (6)
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7. A method implemented in an apparatus for managing a plurality of demodulation units in a wireless communication device, the wireless communication device including a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength, the method comprising:
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generating a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; comparing the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths; and adding a virtual path to the list of paths based on the comparison, wherein the virtual path is associated with a corresponding time offset and signal strength, which do not equal the time offset and signal strength of any one of the plurality of demodulation elements. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A wireless communication device comprising:
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a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; means for generating a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; means for comparing the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths; and means for adding a virtual path to the list of paths based on the comparison, wherein the virtual path is associated with a corresponding time offset and signal strength, which do not equal the time offset and signal strength of any one of the plurality of demodulation elements. - View Dependent Claims (14, 15)
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16. A wireless communication device comprising:
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a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; means for generating a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; means for comparing the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths; means for adding a virtual path to the list of paths based on the comparison; means for replacing a first path from the list of paths with a replacement path having a first time offset and a first signal strength associated with a first demodulation element based on a comparison of the first path and the first demodulation element; and means for placing the virtual path at a second time period and a second signal strength relative to the replacement path.
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17. A wireless communication device comprising:
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a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength; means for generating a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; and means for comparing the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths, wherein the virtual path is added if not more than one path from the list of paths is within a determined time period from a cluster of demodulations elements selected from the plurality of demodulation elements. - View Dependent Claims (18)
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19. A computer program product, comprising:
computer-readable medium for managing a plurality of demodulation units in a wireless communication device, the wireless communication device including a plurality of demodulation elements, each of the plurality of demodulation elements having a corresponding time offset and corresponding signal strength, the computer-readable medium comprising; code for causing a computer to generate a list of paths associated with received signals, each path in the list of paths identified by a corresponding time offset and corresponding signal strength; code for causing a computer to compare the time offsets and the signal strengths of the plurality of demodulation elements with the time offsets and the signal strengths of the list of paths; and code for causing a computer to add a virtual path to the list of paths based on the comparison, wherein the virtual path is associated with a corresponding time offset and signal strength, which do not equal the time offset and signal strength of any one of the plurality of demodulation elements.
Specification