Method and arrangement for interference mitigation
First Claim
1. A method of mitigating interference for received signals in a communication system, characterized by the steps of:
- receiving a transmitted signal via at least two antenna elements;
estimating a channel for said received signals;
estimating a disturbance covariance matrix based on said channel estimate, said estimated disturbance covariance matrix representing received interference plus noise of said received signals;
adapting said estimated covariance matrix by enhancing the diagonal elements of said covariance matrix to provide an enhanced covariance matrix, to reduce the spread in the eigenvalues of said covariance matrix, and thereby improve the robustness of the covariance matrix;
selectively using IRC and/or MRC to mitigate interference of said received signal, based on at least said channel estimate and on said enhanced covariance matrix, to provide a received signal with improved quality on channels with Doppler frequency.
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Accused Products
Abstract
In a method of mitigating interference for received signals in a communication system, receiving S10 a transmitted signal via at least two antenna elements, estimating S20 a channel for the received signals, and estimating S30 a disturbance covariance matrix based on the channel estimate, which estimated disturbance covariance matrix represents received interference plus noise of the received signals. Subsequently, adapting S40 the estimated covariance matrix by enhancing the diagonal elements of the covariance matrix to provide an enhanced covariance matrix, to reduce the spread in eigenvalues of the covariance matrix, and thereby improve the robustness of the covariance matrix. Finally, selectively S50 using IRC and/or MRC to mitigate interference of the received signals, based on at least the channel estimate and on the enhanced covariance matrix, to provide a received signal with improved quality on channels with Doppler frequency.
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Citations
14 Claims
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1. A method of mitigating interference for received signals in a communication system, characterized by the steps of:
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receiving a transmitted signal via at least two antenna elements; estimating a channel for said received signals; estimating a disturbance covariance matrix based on said channel estimate, said estimated disturbance covariance matrix representing received interference plus noise of said received signals; adapting said estimated covariance matrix by enhancing the diagonal elements of said covariance matrix to provide an enhanced covariance matrix, to reduce the spread in the eigenvalues of said covariance matrix, and thereby improve the robustness of the covariance matrix; selectively using IRC and/or MRC to mitigate interference of said received signal, based on at least said channel estimate and on said enhanced covariance matrix, to provide a received signal with improved quality on channels with Doppler frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An arrangement in a communication system, characterized by:
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a receiver configured to receive a signal via at least two antenna elements in said arrangement; a channel estimator configured to provide a channel estimate of said received signal; a disturbance estimator configured to provide an estimate of a disturbance covariance matrix of said channel estimate, said estimated disturbance covariance matrix representing interference plus noise of said channel estimate; an adaptation unit configured to adapt said covariance matrix estimate by enhancing the diagonal elements of said covariance matrix to provide an enhanced covariance matrix, to reduce the spread in the eigenvalues of said covariance matrix, and thereby improve the robustness of the covariance matrix; a IRC/MRC selector configured to selectively use IRC and/or MRC to mitigate interference of said received signal, based on at least said channel estimate and on said enhanced covariance matrix, to provide a received signal with improved quality on channels with Doppler frequency. - View Dependent Claims (11, 12, 13, 14)
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Specification