Sub-sampling antenna elements
First Claim
1. An antenna apparatus comprising:
- a uniform circular array comprising a plurality of omnidirectional antenna elements;
a rotational mechanism which can cause a rotatable part of the antenna apparatus to be rotatably positioned with respect to a fixed non-rotatable part of the antenna apparatus, wherein the uniform circular array is comprised in the rotatable part;
a plurality of RF chains, wherein a number of the plurality of RF chains is less than a number of the plurality of omnidirectional antenna elements;
selective connection circuitry to couple a subset of the plurality of omnidirectional antenna elements to the plurality of RF chains;
sampling circuitry coupled to the plurality of RF chains to sample signals received by the subset of the plurality of omnidirectional antenna elements; and
signal detection circuitry to control a signal detection process comprising the selective connection circuitry iteratively coupling subsets of the plurality of omnidirectional antenna elements to the plurality of RF chains and the signal detection circuitry constructing a signal sample spatial covariance matrix for the plurality of omnidirectional antenna elements from the signals sampled by the sampling circuitry at each iteration,and the signal detection circuitry is configured to apply a beamforming algorithm to the signal sample spatial covariance matrix to parameterise the signals received by the plurality of omnidirectional antenna elements.
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Accused Products
Abstract
An antenna apparatus for use in a wireless network and method of operating such an antenna apparatus are provided. The antenna apparatus has omnidirectional antenna elements and RF chains, where there are fewer RF chains than omnidirectional antenna elements. A subset of the omnidirectional antenna elements are coupled to the RF chains and sampling circuitry coupled to the RF chains samples the signals received by the subset of the omnidirectional antenna elements. This forms part of a signal detection process in which different subsets of the omnidirectional antenna elements are iteratively coupled to the RF chains. A signal sample spatial covariance matrix for the omnidirectional antenna elements is constructed from the signals sampled by the sampling circuitry at each iteration and a beamforming algorithm applied to the signal sample spatial covariance matrix parameterizes the signals received by the omnidirectional antenna elements.
109 Citations
14 Claims
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1. An antenna apparatus comprising:
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a uniform circular array comprising a plurality of omnidirectional antenna elements; a rotational mechanism which can cause a rotatable part of the antenna apparatus to be rotatably positioned with respect to a fixed non-rotatable part of the antenna apparatus, wherein the uniform circular array is comprised in the rotatable part; a plurality of RF chains, wherein a number of the plurality of RF chains is less than a number of the plurality of omnidirectional antenna elements; selective connection circuitry to couple a subset of the plurality of omnidirectional antenna elements to the plurality of RF chains; sampling circuitry coupled to the plurality of RF chains to sample signals received by the subset of the plurality of omnidirectional antenna elements; and signal detection circuitry to control a signal detection process comprising the selective connection circuitry iteratively coupling subsets of the plurality of omnidirectional antenna elements to the plurality of RF chains and the signal detection circuitry constructing a signal sample spatial covariance matrix for the plurality of omnidirectional antenna elements from the signals sampled by the sampling circuitry at each iteration, and the signal detection circuitry is configured to apply a beamforming algorithm to the signal sample spatial covariance matrix to parameterise the signals received by the plurality of omnidirectional antenna elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating an antenna apparatus comprising the steps of:
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selectively coupling a subset of a plurality of omnidirectional antenna elements of the antenna apparatus comprised in a uniform circular array to a plurality of RF chains of the antenna apparatus, wherein a number of the plurality of RF chains is less than a number of the plurality of omnidirectional antenna elements; positioning a rotatable part of the antenna apparatus in rotation with respect to a fixed non-rotatable part of the antenna apparatus, wherein the uniform circular array is comprised in the rotatable part; operating sampling circuitry coupled to the plurality of RF chains to sample signals received by the subset of the plurality of omnidirectional antenna elements; iteratively coupling subsets of the plurality of omnidirectional antenna elements to the plurality of RF chains; constructing a signal sample spatial covariance matrix for the plurality of omnidirectional antenna elements from the signals sampled by the sampling circuitry at each iteration; applying a beamforming algorithm to the signal sample spatial covariance matrix to parameterise the signals received by the plurality of omnidirectional antenna elements.
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14. An antenna apparatus comprising:
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a uniform circular array comprising a plurality of omnidirectional antenna element means; a rotation means for causing a rotatable part of the antenna apparatus to be rotatably positioned with respect to a fixed non-rotatable part of the antenna apparatus, wherein the uniform circular array is comprised in the rotatable part; a plurality of RF chain means, wherein a number of the plurality of RF chain means is less than a number of the plurality of omnidirectional antenna element means; means for selectively coupling a subset of the plurality of omnidirectional antenna element means to the plurality of RF chain means; means for operating sampling circuitry coupled to the plurality of RF chains to sample signals received by the subset of the plurality of omnidirectional antenna elements; means for iteratively coupling subsets of the plurality of omnidirectional antenna elements to the plurality of RF chains; means for constructing a signal sample spatial covariance matrix for the plurality of omnidirectional antenna elements from the signals sampled by the sampling circuitry at each iteration; and means for applying a beamforming algorithm to the signal sample spatial covariance matrix to parameterise the signals received by the plurality of omnidirectional antenna elements.
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Specification