Method and device for multi-user frequency-domain channel estimation
AssigneeMotorola, Inc.
InventorsTimothy A. Thomas, Frederick W. Vook
Life of this patent
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Abstract
The present invention is a technique of estimating the time and frequency response of at least one desired signal received by at least one antenna. The invention is an update formula for the time-invariant channel responses for multiple transmitting devices, called “Doppler channels”, that model the time-varying channel between each of the transmitting devices and each receiving device. Through use of the update formula, the time-varying channels of the multiple transmitting devices can be better tracked than with prior inventions.
Claims8
A method of operating a communication system, the method comprising the steps of:
- producing a plurality of Doppler channels, wherein the Doppler channels are channel estimates produced at a plurality of differing times, and wherein a time-varying channel is represented as a sum of multiple time-invariant Doppler channels;
- computing a Doppler matrix from the plurality of Doppler channels;
- and
- determining a channel estimate from a preexisting channel estimate and the Doppler matrix.
A method of operating a communication system including at least one receiver comprising:
- initializing a time varying channel update device by computing a Doppler vector at time B+1, as a function of the Doppler Parameterization matrix at the times of interest QB, and the Doppler parameterization vector at time B;
- and
- computing an updated device estimation by providing Doppler channel estimates as a function of a Doppler matrix at time B+1, a Doppler vector at time B+1, a Doppler channel estimate at time B, and a channel estimate at time B+1 using a channel estimate at time B+1, and the Doppler channel estimates at time B.
A receiver for a wireless communication system comprising:
- means for producing a plurality of Doppler channels, wherein the Doppler channels are channel estimates produced at a plurality of differing times, and wherein a time-varying channel is represented as a sum of multiple time-invariant Doppler channels;
- means for computing a Doppler matrix from the plurality of Doppler channels;
- and
- means for determining a channel estimate from a preexisting channel estimate and the Doppler matrix.
Dependencies are inferred from the claim text.