Adaptive antenna array wireless data access point
First Claim
1. A wireless communication system providing adaptive beam forming in a transmit signal path, said system comprising:
- an array of antenna elements, wherein said array includes at least M spaced apart antenna elements;
signal transmission circuitry providing M orthogonal renditions of a first signal, wherein said signal transmission circuitry is coupled to said M spaced apart antenna elements to provide a different one of said M orthogonal renditions of said first signal to each of said M spaced apart antenna elements for radiation in said transmit signal path;
signal reception circuitry providing discrete information with respect to each one of said M orthogonal renditions of said first signal as determined from a composite receive signal of said M orthogonal renditions of said first signal;
channel estimator circuitry coupled to said signal reception circuitry and receiving said discrete information with respect to each one of said M orthogonal renditions of said first signal, wherein said channel estimator circuitry determines a spatial signature associated with said composite receive signal; and
beam forming circuitry providing beam forming coefficients to be used in transmission of a second signal, wherein said beam forming coefficients are determined as a function of a conjugate of said spatial signature.
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Abstract
The invention provides systems and methods for providing improved wireless data communication. Preferred embodiments of the present invention utilize multiple antenna beams in the forward link to provide increased forward link capacity and/or improved forward link signal quality. Multiple orthogonal sub-pilots are transmitted from a plurality of antenna elements for use in determining forward link channel characteristics according to a preferred embodiment. Forward link channel estimates may then be made by the preferred embodiment subscriber units and provided in a reverse link control channel to the corresponding base station. Multiple beams may also be utilized in the reverse link to provide increased reverse link capacity, such as for use in providing feedback of forward link channel estimates.
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Citations
30 Claims
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1. A wireless communication system providing adaptive beam forming in a transmit signal path, said system comprising:
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an array of antenna elements, wherein said array includes at least M spaced apart antenna elements;
signal transmission circuitry providing M orthogonal renditions of a first signal, wherein said signal transmission circuitry is coupled to said M spaced apart antenna elements to provide a different one of said M orthogonal renditions of said first signal to each of said M spaced apart antenna elements for radiation in said transmit signal path;
signal reception circuitry providing discrete information with respect to each one of said M orthogonal renditions of said first signal as determined from a composite receive signal of said M orthogonal renditions of said first signal;
channel estimator circuitry coupled to said signal reception circuitry and receiving said discrete information with respect to each one of said M orthogonal renditions of said first signal, wherein said channel estimator circuitry determines a spatial signature associated with said composite receive signal; and
beam forming circuitry providing beam forming coefficients to be used in transmission of a second signal, wherein said beam forming coefficients are determined as a function of a conjugate of said spatial signature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification