Adaptive antenna array with programmable sensitivity
First Claim
1. A method, comprising:
- taking a number of discrete samples of a received signal in an adaptive antenna array processing system;
estimating a noise environment of the received signal from the discrete samples;
applying a regularization constant to a covariance matrix of the received signal to regularize the estimated noise environment;
adding a variable synthetic signal based on the regularized estimated noise environment to the received signal to reduce a noise contribution for noise at power levels below the regularization constant; and
developing a spatial processing strategy based on the regularized noise environment.
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Accused Products
Abstract
Methods and apparatus for calculating spatial processing strategies in adaptive antenna array processing systems. Reference signal quality, intersymbol interference, data processed and received signal quality can be determined by burst type or remote device type and used to determine a synthetic signal level for use in developing a spatial processing strategy. A synthetic signal have an isotropically distributed component can be added to the antennas in the array or the diagonal elements of the received signal covariance matrix to develop uplink and downlink spatial processing strategies. Different synthetic signals at different signal levels can be used to develop different uplink and downlink spatial processing strategies. The downlink signal level can be larger than the uplink signal level. Uplink and downlink processing strategies can be developed in substantially the same way.
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Citations
22 Claims
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1. A method, comprising:
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taking a number of discrete samples of a received signal in an adaptive antenna array processing system; estimating a noise environment of the received signal from the discrete samples; applying a regularization constant to a covariance matrix of the received signal to regularize the estimated noise environment; adding a variable synthetic signal based on the regularized estimated noise environment to the received signal to reduce a noise contribution for noise at power levels below the regularization constant; and developing a spatial processing strategy based on the regularized noise environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An article of manufacture comprising a machine readable medium having instructions to cause a programmable processor to perform operations, including:
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taking a number of discrete samples of a received signal in an adaptive antenna array processing system; estimating a noise environment of the received signal from the discrete samples; applying a regularization constant to a covariance matrix of the received signal to regularize the estimated noise environment, adding a variable synthetic signal based on the regularized estimated noise environment to the received signal to reduce a noise contribution for noise at power levels below the regularization constant; and developing a spatial processing strategy based on the regularized noise environment. - View Dependent Claims (11, 12, 13)
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14. An apparatus for developing a spatial processing strategy in an adaptive antenna array processing system, comprising:
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means for taking a number of discrete samples of a received signal in an adaptive antenna array processing system; means for estimating a noise environment of the received signal from the discrete samples; means for applying a regularization constant to a covariance matrix of the received signal to regularize the estimated noise environment; means for adding a variable synthetic signal based on the regularized estimated noise environment to the received signal to reduce a noise contribution for noise at power levels below the regularization constant; and means for developing a spatial processing strategy based on the regularized noise environment. - View Dependent Claims (15, 16, 17)
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18. A handset comprising:
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a transmitter operative to send an uplink signal to a transceiver, the uplink signal to cause the transceiver to take a discrete number of samples of the uplink signal, estimate a noise environment of the uplink signal from the discrete samples, apply a regularization constant to a covariance matrix of the uplink signal to regularize the estimated noise environment, add a variable synthetic signal based on the regularized estimated noise environment to the uplink signal to reduce a noise contribution for noise at power levels below the regularization constant, develop a downlink processing strategy based on the regularized noise environment, and transmit a downlink signal in accordance with the downlink processing strategy, the downlink signal having an improved signal quality over the uplink signal; and a receiver operative to receive and process the downlink signal having the improved signal quality. - View Dependent Claims (19, 20)
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21. A method comprising:
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sending an uplink signal from a subscriber unit to a transceiver, the uplink signal to cause the transceiver to take a discrete number of samples of the uplink signal, estimate a noise environment of the uplink signal from the discrete samples, apply a regularization constant to a covariance matrix of the uplink signal to regularize the estimated noise environment, add a variable synthetic signal based on the regularized estimated noise environment to the uplink signal to reduce a noise contribution for noise at power levels below the regularization constant, develop a downlink processing strategy with the regularized noise environment, and transmit a downlink signal in accordance based on the downlink processing strategy, the downlink signal having an improved signal quality over the uplink signal; and receiving the downlink signal having the improved signal quality.
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22. A method comprising:
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sending an uplink signal from a subscriber unit to a transceiver; and receiving, at the subscriber unit, a downlink signal from the transceiver produced with a downlink processing strategy, the downlink processing strategy to include estimating a noise environment of the uplink signal from a discrete number of samples of the uplink signal, applying a regularization constant to a covariance matrix of the uplink signal to regularize the estimated noise environment, adding a variable synthetic signal based on the regularized estimated noise environment to the uplink signal to reduce a noise contribution for noise at power levels below the regularization constant.
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Specification