High-performance diagonal loading for MMSE equalization
AssigneeMarvell International Ltd.
InventorsShimon Moshavi, Ram Sever
Life of this patent
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Abstract
A method includes, in a mobile communication terminal, receiving downlink signals from at least two antennas. A signal covariance matrix for the received signals is calculated. Each diagonal element of the signal covariance matrix is enlarged by a respective antenna-specific value that depends on a respective antenna associated with the diagonal element. Equalizer coefficients are computed based on the signal covariance matrix having the enlarged diagonal elements. The received downlink signals are equalized using the equalizer coefficients.
Claims20
A method, comprising:
- in a mobile communication terminal, receiving downlink signals from at least two antennas;
- calculating a signal covariance matrix for the received signals;
- enlarging each diagonal element of the signal covariance matrix by a respective antenna-specific value that depends on a respective antenna associated with the diagonal element;
- computing equalizer coefficients based on the signal covariance matrix having the enlarged diagonal elements;
- and
- equalizing the received downlink signals using the equalizer coefficients.
Apparatus, comprising:
- a receiver front-end, which is configured to receive downlink signals from at least two antennas;
- and
- processing circuitry, which is configured to calculate a signal covariance matrix for the received signals, to enlarge each diagonal element of the signal covariance matrix by a respective antenna-specific value that depends on a respective antenna associated with the diagonal element, to compute equalizer coefficients based on the signal covariance matrix having the enlarged diagonal elements, and to equalize the received downlink signals using the equalizer coefficients.
A method, comprising:
- in a mobile communication terminal, receiving downlink signals from at least two antennas;
- calculating a signal covariance matrix for the received signals;
- evaluating a predefined criterion and choosing, based on the criterion, between:
- enlarging each diagonal element of the signal covariance matrix by a respective antenna-specific value that depends on a respective antenna associated with the diagonal element;
- and
- enlarging each diagonal element of the signal covariance matrix regardless of the respective antenna associated with the diagonal element;
- computing equalizer coefficients based on the signal covariance matrix having the enlarged diagonal elements;
- and
- equalizing the received downlink signals using the equalizer coefficients.
Apparatus, comprising:
- a receiver front-end, which is configured to receive downlink signals from at least two antennas;
- and
- processing circuitry, which is configured to calculate a signal covariance matrix for the received signals, to evaluate a predefined criterion, to choose, based on the criterion, between enlarging each diagonal element of the signal covariance matrix by a respective antenna-specific value that depends on a respective antenna associated with the diagonal element, and between enlarging each diagonal element of the signal covariance matrix regardless of the respective antenna associated with the diagonal element, to compute equalizer coefficients based on the signal covariance matrix having the enlarged diagonal elements, and to equalize the received downlink signals using the equalizer coefficients.
Dependencies are inferred from the claim text.