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US 8,428,197 B2Granted
Enhanced channel estimation for communication system receiver
AssigneeQUALCOMM Incorporated
InventorsSe Bin Im, Jong Hyeon Park, Je Woo Kim, Hyung Jin Choi
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Abstract
An embodiment of the present invention is a technique to process signals in a communication system. A channel impulse response (CIR) generator generates a time-domain windowed CIR from a received signal using a window function. A thresholder thresholds the time-domain windowed CIR. A compensator compensates window effect for the thresholded time-domain windowed CIR to provide an enhanced channel estimate in frequency domain.
Claims31
An apparatus comprising:
- a channel impulse response (CIR) generator to generate a time-domain windowed CIR from a received signal using a window function;
- a thresholder coupled to the CIR generator to threshold the time-domain windowed CIR;
- and
- a compensator coupled to the thresholder to compensate, in the time-domain, for window effect of the thresholded time-domain windowed CIR to provide an enhanced channel estimate,
- wherein the compensator comprises:
- a cluster generator coupled to the thresholder to generate a compensating vector of components in the thresholded time-domain windowed CIR;
- a window compensator to generate a window compensated vector from the compensating vector using a pre-determined inverse matrix of the window function having dimensions corresponding to a length of the compensating vector;
- and
- a frequency-domain processor coupled to the window compensator to compute a frequency-domain vector from the window compensated vector, wherein the frequency-domain vector is the enhanced channel estimate.
6 more elements
A method comprising:
- generating a time-domain windowed CIR from a received signal using a window function;
- thresholding the time-domain windowed CIR;
- and
- compensating, in the time-domain, for window effect of the thresholded time-domain windowed CIR to provide an enhanced channel estimate,
- wherein the compensating comprises:
- generating a compensating vector of components in the thresholded time-domain windowed CIR;
- generating a window compensated vector from the compensating vector using a pre-determined inverse matrix of the window function having dimensions corresponding to a length of the compensating vector;
- and
- computing, by a frequency-domain processor, a frequency-domain vector from the window compensated vector, wherein the frequency-domain vector is the enhanced channel estimate.
6 more elements
A system comprising:
- a plurality of antennae to receive a radio frequency (RF) signal;
- and
- a receiver processing unit coupled to the antennae, the receiver processing unit comprising:
- a receive signal processing unit to process the received RF signal;
- a channel estimator to provide an enhanced channel estimate using the processed received RF signal according to an operational mode;
- and
- an equalizer and combiner coupled to the channel estimator to generate an equalized and combined signal using the processed signals and the enhanced channel estimate,
- wherein the channel estimator comprises:
- a channel impulse response (CIR) generator to generate a time-domain windowed CIR from a received signal using a window function;
- a thresholder coupled to the CIR generator to threshold the time-domain windowed CIR;
- and
- a compensator coupled to the thresholder to compensate, in the time-domain, for window effect of the thresholded time-domain windowed CIR to provide an enhanced channel estimate, and
- wherein the compensator comprises:
- a cluster generator coupled to the thresholder to generate a compensating vector of components in the thresholded time-domain windowed CIR;
- a window compensator to generate a window compensated vector from the compensating vector using a pre-determined inverse matrix of the window function having dimensions corresponding to a length of the compensating vector;
- and
- a frequency-domain processor coupled to the window compensator to compute a frequency-domain vector from the window compensated vector, wherein the frequency-domain vector is the enhanced channel estimate.
14 more elements
An apparatus comprising:
- means for generating a time-domain windowed CIR from a received signal using a window function;
- means for thresholding the time-domain windowed CIR;
- and
- means for compensating, in the time-domain, for window effect of the thresholded time-domain windowed CIR to provide an enhanced channel estimate,
- wherein the means for compensating comprises:
- means for generating a compensating vector of components in the thresholded time-domain windowed CIR;
- means for generating a window compensated vector from the compensating vector using a pre-determined inverse matrix of the window function having dimensions corresponding to a length of the compensating vector;
- and
- means for computing a frequency-domain vector from the window compensated vector, wherein the frequency-domain vector is the enhanced channel estimate.
6 more elements
A machine-readable apparatus comprising a memory unit having one or more software modules stored thereon, the one or more software modules being executable by one or more processors and the one or more software modules comprising:
- code for generating a time-domain windowed CIR from a received signal using a window function;
- code for thresholding the time-domain windowed CIR;
- and
- code for compensating, in the time-domain, for window effect of the thresholded time-domain windowed CIR to provide an enhanced channel estimate,
- wherein the code for compensating comprises:
- code for generating a compensating vector of components in the thresholded time-domain windowed CIR;
- code for generating a window compensated vector from the compensating vector using a pre-determined inverse matrix of the window function having dimensions corresponding to a length of the compensating vector;
- and
- code for computing a frequency-domain vector from the window compensated vector, wherein the frequency-domain vector is the enhanced channel estimate.
6 more elements
Dependencies are inferred from the claim text.