METHOD AND SYSTEM FOR TRANSMITTER BEAMFORMING
First Claim
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1. A method comprising:
- observing a predetermined number of spatial signatures for a communications channel between a base station and a mobile terminal during a predetermined time period;
calculating transform matrices using a most recently observed spatial signature and one or more previously observed spatial signatures;
generating at the base station one or more test spatial signatures from a previously observed spatial signature that form a vector space about the previously observed spatial signature based on the transform matrices such that the vector space is wider than a vector space associated with the observed predetermined number of spatial signatures; and
deriving beamforming weights based on the one or more test spatial signatures for beamforming a transmission to the mobile terminal via an antenna subsystem of the base station, wherein the beamforming weights are configured to generate a wider de-focused beam relative to beamforming weights generated from the observed predetermined number of spatial signatures.
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Abstract
A system and method are provided for improving the performance of a beamforming antenna array in a wireless communications system. By observing a predetermined times of channel spatial signatures, one or more test spatial signatures are generated based on statistical analysis of the observed spatial signatures for predicting channel characteristics. A beamforming weight is derived based on the generated test spatial signatures for beamforming by an antenna subsystem of the wireless communication system.
5 Citations
20 Claims
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1. A method comprising:
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observing a predetermined number of spatial signatures for a communications channel between a base station and a mobile terminal during a predetermined time period; calculating transform matrices using a most recently observed spatial signature and one or more previously observed spatial signatures; generating at the base station one or more test spatial signatures from a previously observed spatial signature that form a vector space about the previously observed spatial signature based on the transform matrices such that the vector space is wider than a vector space associated with the observed predetermined number of spatial signatures; and deriving beamforming weights based on the one or more test spatial signatures for beamforming a transmission to the mobile terminal via an antenna subsystem of the base station, wherein the beamforming weights are configured to generate a wider de-focused beam relative to beamforming weights generated from the observed predetermined number of spatial signatures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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a plurality of antennas; a beamformer unit configured to combine signals of various phases and magnitudes for transmission via the plurality of antennas such that the signals are coherently combined at a mobile terminal; a receiver configured to; observe a predetermined number of spatial signatures for a communications channel between a base station and a mobile terminal during a predetermined time period; and a transmitter configured to; calculate transform matrices using a most recently observed spatial signature and one or more previously observed spatial signatures; generate one or more test spatial signatures from a previously observed spatial signature that form a vector space about the previously observed spatial signature based on the transform matrices such that the vector space is wider than a vector space associated with the observed predetermined number of spatial signatures; and derive beamforming weights based on the one or more test spatial signatures, wherein the beamforming weights are configured to generate a wider de-focused beam relative to a beam generated from the observed predetermined number of spatial signatures. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification