Multiple antenna multicarrier communication system and method with reduced mobile-station processing
First Claim
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1. A method comprising:
- generating an initial channel transfer function estimate of a orthogonal frequency division multiplexed (OFDM) communication channel for each of a plurality of channel paths between a multi-antenna mobile station and a multi-antenna base station using a frequency domain representation of received signals;
estimating a sampled channel impulse response by performing an inverse Fourier transformation on the initial channel transfer function estimate;
representing the estimate of the sampled channel impulse response by a plurality of rays for each of the channel paths;
generating a quantized time-domain representation of the initial channel transfer function estimate for each of the channel paths from at least some of the rays; and
sending the quantized time-domain representation of the initial channel transfer function estimate to the base station for use in generating beamforming coefficients for use in subsequent transmissions to the mobile station,wherein each ray is associated with a different delay of the estimated sampled channel impulse response for an associated channel path.
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Abstract
In a multiple-input multiple-output (MIMO) multicarrier communication system, a mobile station sends a quantized time-domain representation of the channel transfer function to a base station for use by the base station in generating beamforming coefficients for use in subsequent transmissions to the mobile station. In some embodiments, the quantized time-domain representation of the channel transfer function may be generated from selected most significant rays of an initial estimated sampled channel impulse response. Other embodiments may be described and claimed.
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Citations
20 Claims
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1. A method comprising:
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generating an initial channel transfer function estimate of a orthogonal frequency division multiplexed (OFDM) communication channel for each of a plurality of channel paths between a multi-antenna mobile station and a multi-antenna base station using a frequency domain representation of received signals; estimating a sampled channel impulse response by performing an inverse Fourier transformation on the initial channel transfer function estimate; representing the estimate of the sampled channel impulse response by a plurality of rays for each of the channel paths; generating a quantized time-domain representation of the initial channel transfer function estimate for each of the channel paths from at least some of the rays; and sending the quantized time-domain representation of the initial channel transfer function estimate to the base station for use in generating beamforming coefficients for use in subsequent transmissions to the mobile station, wherein each ray is associated with a different delay of the estimated sampled channel impulse response for an associated channel path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multicarrier mobile station comprising:
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a channel estimator to generate an initial channel transfer function estimate of a orthogonal frequency division multiplexed (OFDM) communication channel for each of a plurality of channel paths between a multi-antenna mobile station and a multi-antenna base station using a frequency domain representation of received signals; inverse Fourier transform circuitry to estimate a sampled channel impulse response performing an inverse Fourier transformation on the initial channel transfer function estimate; circuitry to generate a quantized time-domain representation of the initial channel transfer function estimate; and circuitry to send the quantized time-domain representation of the initial channel transfer function to a base station for use by the base station in generating beamforming coefficients for use in subsequent transmissions to the mobile station, wherein the circuitry to generate the quantized time-domain representation represents the estimate of the sampled channel impulse response by a plurality of rays for each of the channel paths, wherein each ray is associated with a different delay of the estimated sampled channel impulse response for an associated channel path, and wherein the quantized time-domain representation is generated from some of the rays. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer-readable medium that stores instructions for execution by one or more processors, which when executed, cause the one or more processors to send a quantized time-domain representation of an initial channel transfer function from a mobile station to a base station for use by the base station in generating beamforming coefficients for use in subsequent transmissions to the mobile station, wherein the execution of the instructions result in:
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generating the initial channel transfer function estimate of a orthogonal frequency division multiplexed (OFDM) communication channel for each of a plurality of channel paths between a multi-antenna mobile station and a multi-antenna base station using a frequency domain representation of received signals; estimating a sampled channel impulse response by performing an inverse Fourier transformation on the channel transfer function estimate; representing the estimate of the sampled channel impulse response by a plurality of rays for each of the channel paths, and generating a quantized time-domain representation of the initial channel transfer function estimate for each of the channel paths from at least some of the rays, wherein each ray is associated with a different delay of the estimated sampled channel impulse response for an associated channel path. - View Dependent Claims (20)
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Specification