System and method for improving performance of an adaptive antenna array in a vehicular environment
First Claim
1. For use in wireless network communications system comprising a base transceiver station having an adaptive antenna array and a mobile station having a first mobile antenna and a second mobile antenna, an apparatus for improving downlink performance of said adaptive antenna array of said base transceiver station, said apparatus comprising:
- a spatial signature estimator associated with said base transceiver station, said spatial signature estimator capable of obtaining a spatial signature from a signal received by said base transceiver station from said first mobile antenna and that is capable of obtaining a spatial signature from a signal received by said base transceiver station from said second mobile antenna; and
correlation circuitry coupled to said spatial signature estimator, said correlation circuitry capable of using spatial signatures obtained from said first mobile antenna and from said second mobile antenna to identify a least changing spatial signature, and capable of using said least changing spatial signature to obtain a downlink beamforming weight vector.
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Abstract
A system and method is disclosed for improving downlink performance of an adaptive antenna array in a vehicular environment. The system comprises a mobile station that has a first mobile antenna and a second mobile antenna. A spatial signature estimator associated with a base transceiver station obtains spatial signatures from signals from the first mobile antenna and from the second mobile antenna within an uplink interval. Correlation circuitry uses the spatial signatures to identify a least changing spatial signature to obtain an optimal downlink beamforming weight vector to be used in the transmission of a signal to the mobile station in the next downlink interval.
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Citations
20 Claims
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1. For use in wireless network communications system comprising a base transceiver station having an adaptive antenna array and a mobile station having a first mobile antenna and a second mobile antenna, an apparatus for improving downlink performance of said adaptive antenna array of said base transceiver station, said apparatus comprising:
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a spatial signature estimator associated with said base transceiver station, said spatial signature estimator capable of obtaining a spatial signature from a signal received by said base transceiver station from said first mobile antenna and that is capable of obtaining a spatial signature from a signal received by said base transceiver station from said second mobile antenna; and
correlation circuitry coupled to said spatial signature estimator, said correlation circuitry capable of using spatial signatures obtained from said first mobile antenna and from said second mobile antenna to identify a least changing spatial signature, and capable of using said least changing spatial signature to obtain a downlink beamforming weight vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. For use in wireless network communications system comprising a base transceiver station having an adaptive antenna array and a mobile station having a first mobile antenna and a second mobile antenna, a method for improving downlink performance of said adaptive antenna array of said base transceiver station, said method comprising the steps of:
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obtaining in a spatial signature estimator associated with said base transceiver station a spatial signature from a signal received by said base transceiver station from said first mobile antenna;
obtaining in said spatial signature estimator a spatial signature from a signal received by said base transceiver station from said second mobile antenna; and
using spatial signatures obtained from said first mobile antenna and from said second mobile antenna to identify a least changing spatial signature; and
using said least changing spatial signature to obtain a downlink beamforming weight vector. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification