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US 8,135,351 B2Granted
Systems and methods for improving channel estimation
AssigneeQUALCOMM Incorporated
InventorsDurga Prasad Malladi, Josef Blanz, Yongbin Wei
Life of this patent
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Abstract
A method for improving channel estimation in a wireless communication system is disclosed. A wireless signal that includes a plurality of multipath components is received. N channel estimates are then obtained, where N is any positive integer greater than one. Each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components. The effects of interference between the plurality of multipath components on the N channel estimates is then reduced.
Claims31
A method for improving channel estimation in a wireless communication system, comprising:
- receiving a wireless signal that comprises a plurality of multipath components;
- estimating a time delay for at least one of the plurality of multipath components;
- obtaining N channel estimates, wherein N is any positive integer greater than one, wherein each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components;
- and
- reducing the effects of interference between the plurality of multipath components on the N channel estimates by calculating and applying a fading coefficient vector estimate to the N channel estimates based on a correlation matrix and a covariance matrix;
- wherein obtaining the N channel estimates comprises correlating each of N descrambled signals with a reference signal to obtain the N channel estimates, the reference signal including a downlink channel, and wherein the reference signal is further used to calculate the correlation matrix and the covariance matrix and reducing the effects of interference employs the correlation matrix and the covariance matrix, and the correlation matrix and covariance matrix employ the reference signal.
3 more elements
A mobile station for use in a wireless communication system, the mobile station comprising:
- at least one antenna for receiving a wireless signal that comprises a plurality of multipath components;
- a receiver in electronic communication with the at least one antenna;
- and
- an enhanced channel estimator that implements a method comprising:
- estimating a time delay for at least one of the plurality of multipath components;
- obtaining N channel estimates, wherein N is any positive integer greater than one, wherein each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components;
- and
- reducing the effects of interference between the plurality of multipath components on the N channel estimates by calculating and applying a fading coefficient vector estimate to the N channel estimates based on a multipath correlation matrix and a noise covariance matrix;
- wherein obtaining the N channel estimates comprises correlating each of N descrambled signals with a reference signal to obtain the N channel estimates, the reference signal including a downlink channel, and wherein the reference signal is further used to calculate the multipath correlation matrix and the noise covariance matrix and reducing the effects of interference is based on the correlation matrix and the covariance matrix, and the correlation matrix and covariance matrix are based on the reference signal.
6 more elements
An apparatus for use in a wireless communication system, the mobile station comprising:
- at least one antenna for receiving a wireless signal that comprises a plurality of multipath components;
- a receiver in electronic communication with the at least one antenna;
- and
- an enhanced channel estimator that implements a method comprising:
- estimating a time delay for at least one of the plurality of multipath components;
- obtaining N channel estimates, wherein N is any positive integer greater than one, wherein each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components;
- and
- reducing the effects of interference between the plurality of multipath components on the N channel estimates by calculating and applying a fading coefficient vector estimate to the N channel estimates based on a correlation matrix and a covariance matrix;
- wherein obtaining the N channel estimates comprises correlating each of N descrambled signals with a reference signal to obtain the N channel estimates, the reference signal including a downlink channel, and wherein the reference signal is further used to calculate the correlation matrix and the covariance matrix and reducing the effects of interference is based on the correlation matrix and the covariance matrix, and the correlation matrix and covariance matrix are based on the reference signal.
6 more elements
A mobile station for use in a wireless communication system, the mobile station comprising:
- means for estimating a time delay for at least one of the plurality of multipath components;
- means for receiving a wireless signal that comprises a plurality of multipath components;
- means for obtaining N channel estimate, wherein N is any positive integer greater than one, wherein each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components;
- and
- means for reducing the effects of interference between the plurality of multipath components on the N channel estimates by calculating and applying a fading coefficient vector estimate to the N channel estimates based on a correlation matrix and a covariance matrix;
- wherein the means for obtaining the N channel estimates is configured to correlate each of the N descrambled signals with a reference signal to obtain the N channel estimates, the reference signal including a downlink channel, and wherein the reference signal is further used to calculate the correlation matrix and the covariance matrix and reducing the effects of interference is based on the correlation matrix and the covariance matrix, and the correlation matrix and covariance matrix are based on the reference signal.
3 more elements
A non-transitory storage medium readable by a processor, the storage medium encoded with a computer program, the computer program comprising instructions executable to perform a method for improving channel estimation in a wireless communication system, the method comprising:
- receiving a wireless signal that comprises a plurality of multipath components;
- estimating a time delay for at least one of the plurality of multipath components;
- obtaining N channel estimates, wherein N is any positive integer greater than one, wherein each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components;
- and
- reducing the effects of interference between the plurality of multipath components on the N channel estimates by calculating and applying a fading coefficient vector estimate to the N channel estimates based on a correlation matrix and a covariance matrix;
- wherein obtaining the N channel estimates comprises correlating each of the N descrambled signals with a reference signal to obtain the N channel estimates, the reference signal including a downlink channel, and wherein the reference signal is further used to calculate the correlation matrix and the covariance matrix and reducing the effects of interference is based on the correlation matrix and the covariance matrix, and the correlation matrix and covariance matrix are based on the reference signal.
3 more elements
Dependencies are inferred from the claim text.