Method and apparatus for performing a signal detection and assignment in a wireless communication system
First Claim
1. In a code division multiple access wireless communication system, the system including an antenna, a base station multipath signal searcher for generating a plurality of search metrics from a plurality of multipath signals of a mobile station signal, and a base station transceiver for demodulating the mobile station signal, a method for detecting the mobile station signal comprising the steps of:
- receiving the plurality of search metrics, each of the plurality of search metrics having an offset index and an offset energy value, the offset index corresponding to one of a plurality of time offsets associated with a multipath signal of the mobile station signal;
calculating a plurality of decoding success predictors based on a plurality of combinations of the offset energy values, the plurality of decoding success predictors indicating a likelihood of successful mobile station signal demodulation;
selecting a maximum decoding success predictor from the plurality of decoding success predictors; and
acknowledging a mobile station signal detection by the base station transceiver if the maximum decoding success predictor has a value greater than zero.
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Abstract
In a wireless communication system comprising an effective ray detector, a method for detecting and assigning a mobile station signal including receiving a plurality of search metrics, the plurality of search metrics including a plurality of offset energy values at corresponding time offsets, sorting the plurality of search metrics in order of their offset energy values, calculating a plurality of decoding success predictors, and selecting the decoding success predictor having the maximum value. The method also includes forwarding an acknowledgment message declaring signal detection to the mobile station if the maximum decoding success predictor has a value greater than zero. The method further includes assigning receiver demodulation at the time offsets associated with the maximum decoding success predictor if the maximum decoding success predictor has a value greater than zero.
30 Citations
25 Claims
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1. In a code division multiple access wireless communication system, the system including an antenna, a base station multipath signal searcher for generating a plurality of search metrics from a plurality of multipath signals of a mobile station signal, and a base station transceiver for demodulating the mobile station signal, a method for detecting the mobile station signal comprising the steps of:
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receiving the plurality of search metrics, each of the plurality of search metrics having an offset index and an offset energy value, the offset index corresponding to one of a plurality of time offsets associated with a multipath signal of the mobile station signal;
calculating a plurality of decoding success predictors based on a plurality of combinations of the offset energy values, the plurality of decoding success predictors indicating a likelihood of successful mobile station signal demodulation;
selecting a maximum decoding success predictor from the plurality of decoding success predictors; and
acknowledging a mobile station signal detection by the base station transceiver if the maximum decoding success predictor has a value greater than zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
adding the largest offset energy value of the plurality of offset energy values and a first penalty value to form a first decoding success predictor; and
adding the largest offset energy value of the plurality of offset energy values and the second largest offset energy value of the plurality of offset energy values and a second penalty value to form a second decoding success predictor.
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3. A method for detecting the mobile station signal according to claim 2, wherein the first penalty value represents a predetermined noise aggregate of one of the plurality of multipath signals.
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4. A method for detecting the mobile station signal according to claim 2, wherein the second penalty value represents a predetermined noise aggregate of two of the plurality of multipath signals.
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5. A method for detecting the mobile station signal according to claim 1, wherein the step of acknowledging the mobile station signal detection further comprises sending an Acknowledgment Message to the mobile station, the Acknowledgment Message indicating to a mobile station that the mobile station signal was transmitted at a sufficient power level.
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6. A method for detecting the mobile station signal according to claim 1, wherein the mobile station signal is selected from the group consisting of a mobile station signaling signal, a mobile station voice signal, and a mobile station data signal.
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7. A method for detecting the mobile station signal according to claim 1, further comprising the steps of:
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selecting a subset of a plurality of offset indices corresponding to the plurality of combinations of the offset energy values used to calculate the maximum decoding success predictor to form a detected set of offset indices;
forwarding the detected set of offset indices to the base station transceiver; and
assigning demodulation of the mobile station signal to occur at the detected set of offset indices.
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8. A method for detecting the mobile station signal according to claim 1, further comprising the step of sorting the plurality of search metrics in descending order of their offset energy values to yield a plurality of sorted search metrics, each of the plurality of sorted search metrics having a sorted offset index and a sorted offset energy value.
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9. A method for detecting the mobile station signal according to claim 8, wherein the step of calculating the plurality of decoding success predictors comprises:
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adding the sorted offset energy value corresponding to the first of the plurality of sorted search metrics and a first penalty value to form a first decoding success predictor; and
adding the sorted offset energy value corresponding to the first of the plurality of sorted search metrics and the sorted offset energy value corresponding to the second of the plurality of sorted search metrics and a second penalty value to form a second decoding success predictor.
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10. A method for detecting the mobile station signal according to claim 9, wherein the first penalty value represents a predetermined noise aggregate of one of the plurality of multipath signals.
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11. A method for detecting the mobile station signal according to claim 9, wherein the second penalty value represents a predetermined noise aggregate of two of the plurality of multipath signals.
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12. A method for detecting the mobile station signal according to claim 8, wherein the step of acknowledging the mobile station signal detection further comprises sending an Acknowledgment Message to a mobile station, the Acknowledgment Message indicating to the mobile station that the mobile station signal was transmitted at a sufficient power level.
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13. A method for detecting the mobile station signal according to claim 8, wherein the mobile station signal is selected from the group consisting of a mobile station signaling signal, a mobile station voice signal, and a mobile station data signal.
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14. A method for detecting the mobile station signal according to claim 8, further comprising the steps of:
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selecting a subset of a plurality of offset indices corresponding to the plurality of combinations of the offset energy values used to calculate the maximum decoding success predictor to form a detected set of offset indices;
forwarding the detected set of offset indices to the base station transceiver; and
assigning demodulation of the mobile station signal to occur at the detected set of offset indices.
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15. In a code division multiple access wireless communication system, the system including an antenna, a base station multipath signal searcher and a base station transceiver, a method for detecting and assigning a mobile communication signal comprising the steps of:
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receiving a first multipath signal having a first offset energy at a first time offset, the first multipath signal resulting from the mobile communication signal;
receiving a second multipath signal having a second offset energy at a second time offset, the second multipath signal resulting from the mobile communication signal;
receiving a third multipath signal having a third offset energy at a third time offset, the third multipath signal resulting from the mobile communication signal;
generating a first search metric, the first search metric having a first offset index and a first offset energy value, the first offset index corresponding to the first time offset;
generating a second search metric, the second search metric having a second offset index and a second offset energy value, the second offset index corresponding to the second time offset;
generating a third search metric, the third search metric having a third offset index and a third offset energy value, the third offset index corresponding to the third time offset;
sorting the search metrics in descending order of their corresponding offset energy values to yield a sorted search metric set, the sorted search metric set including;
a first sorted search metric corresponding to the search metric having largest offset energy value, the first sorted search metric having a first sorted offset index;
a second sorted search metric corresponding to the second largest offset energy value, the second sorted search metric having a second sorted offset index; and
a third sorted search metric corresponding to the third largest offset energy value, the third sorted search metric having a third sorted offset index;
adding the offset energy value corresponding to the first sorted search metric and a first penalty value to form a first decoding success predictor;
adding the offset energy value corresponding to the first sorted search metric and the offset energy value corresponding to the second sorted search metric and a second penalty value to form a second decoding success predictor;
adding the offset energy value corresponding to the first sorted search metric and the offset energy value corresponding to the second sorted search metric and the offset energy value corresponding to the third sorted search metric and a third penalty value to form a third decoding success predictor;
selecting a maximum decoding success predictor, the maximum decoding success predictor having the highest value;
directing the base station transceiver to send a message if the maximum decoding success predictor has a value greater than zero;
selecting the offset indices corresponding to the offset energy values used to calculate the maximum decoding success predictor, to form a detected set of offset indices if the maximum decoding success predictor has a value greater than zero;
forwarding the detected set of offset indices to the base station transceiver; and
assigning demodulation of the mobile communication signal to occur at the detected set of offset indices. - View Dependent Claims (16, 17, 18, 19)
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20. An effective ray detector for use in a code division multiple access wireless communication system conveying a mobile station signal, the code division multiple access wireless communication system including an antenna, a base station multipath signal searcher for generating a plurality of search metrics from the mobile station signal, and a base station transceiver for demodulating the mobile station signal, the effective ray detector comprising:
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an offset energy sorter adapted to sort a plurality of received search metrics having a corresponding plurality of received offset indices and a corresponding plurality of received offset energy values to yield a plurality of sorted search metrics, the plurality of sorted search metrics having a corresponding plurality of sorted offset indices and a corresponding plurality of sorted offset energy values, the plurality of received offset indices corresponding to a plurality of time offsets of a plurality of multipath signals resulting from the mobile station signal;
a decoding success predictor calculator adapted to calculate a plurality of decoding success predictors corresponding to a plurality of combinations of the sorted offset energy values, the plurality of decoding success predictors indicating a likelihood of successful mobile station signal demodulation;
a max decoding success predictor selector adapted to select a maximum decoding success predictor from the plurality of decoding success predictors, the maximum decoding success predictor having the highest value;
a decoding success predictor threshold indicator adapted to forward the maximum decoding success predictor if the maximum decoding success predictors has a value greater than zero; and
a winning offset selector adapted to select a subset of the plurality of sorted offset indices corresponding to the plurality of combinations of the sorted offset energy values used to calculate the maximum decoding success predictor to form a detected set of offset indices. - View Dependent Claims (21, 22, 23, 24, 25)
adding the sorted offset energy value corresponding to the first of the plurality of sorted search metrics and a first penalty value to form a first decoding success predictor; and
adding the sorted offset energy value corresponding to the first of the plurality of sorted search metrics and the sorted offset energy value corresponding to the second of the plurality of sorted search metrics and a second penalty value to form a second decoding success predictor.
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24. The effective ray detector according to claim 23, wherein the first penalty value represents a predetermined noise aggregate of one of the plurality of multipath signals.
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25. The effective ray detector according to claim 23, wherein the second penalty value represents a predetermined noise aggregate of two of the plurality of multipath signals.
Specification