Communications systems including adaptive antenna systems and methods for inter-system and intra-system interference reduction
First Claim
1. A method of forming a downlink beam in an adaptive antenna system of a communications system, comprising:
- receiving vectors of signals including signals transmitted by user terminals of the communications system and signals transmitted by transceivers of an independent communications system;
obtaining spatial information for the user terminals of the communications system and the transceivers of the independent communications system;
generating complex transmitting weights that form spatial nulls directed at the transceivers of the independent communications system; and
transmitting a downlink communications signal using the complex transmitting weights,wherein obtaining spatial information for the user terminals of the communications system and the transceivers of the independent communications system comprises obtaining the spatial information using the received vectors of signals,wherein obtaining spatial information comprises generating estimates of an array covariance matrix using the signals transmitted by the user terminals of the communications system and the signals transmitted by the transceivers of an independent communications system, andwherein generating estimates of the array covariance matrix comprises;
estimating a covariance matrix for the transceivers of the independent communications system;
estimating a covariance matrix for the user terminals of the communications system; and
deriving a composite covariance matrix by combining the covariance matrix for the transceivers of the independent communications system with the covariance matrix for the user terminals of the communications system.
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Accused Products
Abstract
Methods of forming a downlink beam in an adaptive antenna system of a communications system that may reduce inter-system and/or intra-system interference include receiving vectors of signals including signals transmitted by user terminals of the communications system and signals transmitted by transceivers of an independent communications system, obtaining spatial information for the user terminals of the communications system and the transceivers of the independent communications system, generating complex transmitting weights that form spatial nulls directed at the transceivers of the independent communications system, and transmitting a downlink communications signal using the complex transmitting weights. Related systems are also disclosed.
164 Citations
50 Claims
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1. A method of forming a downlink beam in an adaptive antenna system of a communications system, comprising:
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receiving vectors of signals including signals transmitted by user terminals of the communications system and signals transmitted by transceivers of an independent communications system; obtaining spatial information for the user terminals of the communications system and the transceivers of the independent communications system; generating complex transmitting weights that form spatial nulls directed at the transceivers of the independent communications system; and transmitting a downlink communications signal using the complex transmitting weights, wherein obtaining spatial information for the user terminals of the communications system and the transceivers of the independent communications system comprises obtaining the spatial information using the received vectors of signals, wherein obtaining spatial information comprises generating estimates of an array covariance matrix using the signals transmitted by the user terminals of the communications system and the signals transmitted by the transceivers of an independent communications system, and wherein generating estimates of the array covariance matrix comprises; estimating a covariance matrix for the transceivers of the independent communications system; estimating a covariance matrix for the user terminals of the communications system; and deriving a composite covariance matrix by combining the covariance matrix for the transceivers of the independent communications system with the covariance matrix for the user terminals of the communications system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A base transceiver system of a communications system, comprising:
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an antenna array configured to receive vectors of signals including signals transmitted by user terminals of the communications system and signals transmitted by transceivers of an independent communications system; and an electronics system coupled to the antenna array and configured to obtain spatial information for the user terminals of the communications system and the transceivers of the independent communications system, to generate complex transmitting weights that form spatial nulls directed at the transceivers of the independent communications system, and to transmit a downlink communications signal over the antenna array using the complex transmitting weights, wherein the electronics system is configured to obtain spatial information for the user terminals of the communications system and the transceivers of the independent communications system using the received vectors of signals, wherein the electronics system is configured to generate estimates of an array covariance matrix using the signals transmitted by the user terminals of the communications system and the signals transmitted by the transceivers of an independent communications system, and wherein the electronics system is configured to generate estimates of the array covariance matrix by estimating a covariance matrix for the transceivers of the independent communications system, estimating a covariance matrix for the user terminals of the communications system, and deriving a composite covariance matrix by combining the covariance matrix for the transceivers of the independent communications system with the covariance matrix for the user terminals of the communications system. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A communications system, comprising:
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user terminals configured to generate communication signals in a first frequency band; and a base transceiver system comprising; an antenna array configured to receive vectors of signals including signals transmitted by the user terminals in the first frequency band and signals transmitted by transceivers of an independent communications system in a second frequency band and an electronics system coupled to the antenna array and configured to obtain spatial information for the user terminals of the communications system and the transceivers of the independent communications system, to generate complex transmitting weights that form spatial nulls directed at the transceivers of the independent communications system, and to transmit a downlink communications signal to at least one of the user terminals of the communications system over the antenna array using the complex transmitting weights, wherein the electronics system is configured to obtain spatial information for the user terminals of the communications system and the transceivers of the independent communications system using the received vectors of signals, wherein the electronics system is configured to generate estimates of an array covariance matrix using the signals transmitted by the user terminals of the communications system and the signals transmitted by the transceivers of an independent communications system, and wherein the electronics system is configured to generate estimates of the array covariance matrix by estimating a covariance matrix for the transceivers of the independent communications system, estimating a covariance matrix for the user terminals of the communications system, and deriving a composite covariance matrix by combining the covariance matrix for the transceivers of the independent communications system with the covariance matrix for the user terminals of the communications system. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification