Adaptive antenna array methods and apparatus for use in a multi-access wireless communication system
First Claim
1. A method for providing adaptation of an antenna array in a base station associated with a cell of a cellular wireless communication system, comprising the steps of:
- estimating a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array;
processing the estimated spatial covariance matrices to generate an estimate of an interference matrix for the plurality of mobile stations;
estimating an array response for the given mobile station from the interference matrix;
processing the array response for the given mobile station to generate an antenna weighting associated with the given mobile station; and
applying the antenna weighting to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol.
5 Assignments
0 Petitions
Accused Products
Abstract
Adaptive antenna array techniques for use in an orthogonal frequency division multiplexed spread-spectrum multi-access (OFDM-SSMA) cellular wireless system or other type of wireless communication system. A base station of the system includes an antenna array and a base station receiver. The base station receiver implements an adaptive antenna gain algorithm which estimates a spatial covariance matrix for each of K mobile stations communicating with the base station. The spatial covariance matrix for a given one of the mobile stations is determined at least in part based on a unique hopping sequence of the mobile station, and provides a correlation between signals received from the mobile station at different antenna elements within the antenna array. An average spatial covariance matrix for a set of received signals is also generated. The individual spatial covariance matrices and the average spatial covariance matrix are processed to generate an estimate of an interference matrix for the K mobile stations, and the estimate of the interference matrix is further processed to generate array responses for each of the mobile stations. The array response for a given mobile station is processed to determine an antenna weighting which is applied to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol.
-
Citations
20 Claims
-
1. A method for providing adaptation of an antenna array in a base station associated with a cell of a cellular wireless communication system, comprising the steps of:
-
estimating a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array;
processing the estimated spatial covariance matrices to generate an estimate of an interference matrix for the plurality of mobile stations;
estimating an array response for the given mobile station from the interference matrix;
processing the array response for the given mobile station to generate an antenna weighting associated with the given mobile station; and
applying the antenna weighting to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. An apparatus for use in a base station associated with a cell of a cellular wireless communication system and having an antenna array, the apparatus comprising:
a base station receiver coupled to the antenna array and operative;
(i) to estimate a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array;
(ii) to process the estimated spatial covariance matrices to generate an estimate of an interference matrix for the plurality of mobile stations;
(iii) to estimate an array response for the given mobile station from the interference matrix;
(iv) to process the array response for the given mobile station to generate an antenna weighting associated with the given mobile station; and
(v) to apply the antenna weighting to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol.
-
16. An apparatus for providing adaptation of an antenna array in a base station associated with a cell of a cellular wireless communication system, the apparatus comprising:
-
means for estimating a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array;
means for processing the estimated spatial covariance matrices to generate an estimate of an interference matrix for the plurality of mobile stations;
means for estimating an array response for the given mobile station from the interference matrix;
means for processing the array response for the given mobile station to generate an antenna weighting associated with the given mobile station; and
means for applying the antenna weighting to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol.
-
-
17. A method for providing adaptation of an antenna array in a base station associated with a cell of a cellular wireless communication system, comprising the steps of:
-
determining a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array; and
processing the estimated spatial covariance matrices to determine an antenna weighting associated with the given mobile station;
wherein the antenna weighting is applied to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol; and
wherein the unique hopping sequence specifies for the given mobile station a hopping between tones of a plurality of orthogonal frequency division multiplexed tones, each of the mobile stations being assigned one or more of the tones for use in conjunction with transmission of a corresponding symbol, the tone assignments being changed for the mobile stations on a symbol-by-symbol basis.
-
-
18. An apparatus for use with a base station associated with a cell of a cellular wireless communication system and having an antenna array, the apparatus comprising:
-
a base station receiver coupled to the antenna array and operative;
(i) to determine a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array; and
(ii) to process the estimated spatial covariance matrices to determine an antenna weighting associated with the given mobile station;
wherein the antenna weighting is applied to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol; and
wherein the unique hopping sequence specifies for the given mobile station a hopping between tones of a plurality of orthogonal frequency division multiplexed tones, each of the mobile stations being assigned one or more of the tones for use in conjunction with transmission of a corresponding symbol, the tone assignments being changed for the mobile stations on a symbol-by-symbol basis.
-
-
19. An apparatus for providing adaptation for an antenna array of a base station associated with a cell of a cellular wireless communication system, the apparatus comprising:
-
means for determining a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array;
means for processing the estimated spatial covariance matrices to determine an antenna weighting associated with the given mobile station; and
weight applying means for applying the antenna weighting to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol;
wherein the unique hopping sequence specifies for the given mobile station a hopping between tones of a plurality of orthogonal frequency division multiplexed tones, each of the mobile stations being assigned one or more of the tones for use in conjunction with transmission of a corresponding symbol, the tone assignments being changed for the mobile stations on a symbol-by-symbol basis.
-
-
20. An apparatus for use with a base station associated with a cell of a cellular wireless communication system and having an antenna array, the apparatus comprising:
-
a processor operative;
(i) to determine a spatial covariance matrix for each of a plurality of mobile stations communicating with the base station, the spatial covariance matrix for a given one of the mobile stations being determined at least in part based on a unique hopping sequence of the mobile station and providing a correlation between signals received from the mobile station at different antenna elements within the antenna array; and
(ii) to process the estimated spatial covariance matrices to determine an antenna weighting associated with the given mobile station;
wherein the antenna weighting is applied to a signal received from the given mobile station in order to facilitate detection of a corresponding transmitted symbol, and wherein the unique hopping sequence specifies for the given mobile station a hopping between tones of a plurality of orthogonal frequency division multiplexed tones, each of the mobile stations being assigned one or more of the tones for use in conjunction with transmission of a corresponding symbol, the tone assignments being changed for the mobile stations on a symbol-by-symbol basis.
-
Specification