COMMUNICATION STATION AND METHOD FOR EFFICIENTLY PROVIDING CHANNEL FEEDBACK FOR MIMO COMMUNICATIONS
First Claim
1. A method performed by a receiving station for providing channel feedback for an orthogonal frequency division multiplexed (OFDM) channel, the method comprising:
- performing recursive differential quantization of channel information across at least one of time and frequency to generate quantized differential channel feedback; and
transmitting the quantized differential channel feedback to a transmitting station for use in precoding a multiple-input multiple-output (MIMO) transmission, wherein the quantized differential channel feedback comprises one of a quantized differential channel matrix and a quantized differential beamforming matrix.
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Abstract
Embodiments of a communication station and methods for efficiently providing channel feedback for MIMO communications over an OFDM channel are generally described herein. In some embodiments, receiving stations may perform a recursive differential quantization of channel information across time and/or frequency to generate quantized differential channel feedback. The quantized differential channel feedback from each receiving station may be used by a transmitting station to precode MIMO transmissions to one or more of the receiving stations. The quantized differential channel feedback may be either a quantized differential channel matrix or a quantized differential beamforming matrix.
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Citations
27 Claims
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1. A method performed by a receiving station for providing channel feedback for an orthogonal frequency division multiplexed (OFDM) channel, the method comprising:
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performing recursive differential quantization of channel information across at least one of time and frequency to generate quantized differential channel feedback; and transmitting the quantized differential channel feedback to a transmitting station for use in precoding a multiple-input multiple-output (MIMO) transmission, wherein the quantized differential channel feedback comprises one of a quantized differential channel matrix and a quantized differential beamforming matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A receiving station configured to provide channel feedback for multiple-input multiple-output (MIMO) communications over an orthogonal frequency division multiplexed (OFDM) channel, the receiving station comprising:
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differential quantization circuitry to recursively quantize differential channel information across one of time and frequency to generate quantized differential channel feedback; and circuitry to transmit the quantized differential channel feedback to a transmitting station for use in precoding a MIMO transmission for subsequent receipt by the receiving station, wherein the quantized differential channel feedback comprises one of a quantized differential channel matrix and a quantized differential beamforming matrix. - View Dependent Claims (15, 16, 17, 18)
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19. A method for performing differential quantization of channel information to generate a quantized differential channel matrix for multiple-input multiple-output (MIMO) communications over an orthogonal frequency division multiplexed (OFDM) channel, the method comprising:
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either normalizing a channel matrix for a first subcarrier in the frequency domain and using a differential codebook to recursively quantize a difference between the normalized channel matrix for the first subcarrier and an initial reference matrix;
orscaling the differential codebook to match channel magnitude and using the scaled differential codebook to recursively quantize a difference between the channel matrix for the first subcarrier and the initial reference matrix, and iteratively updating the initial reference matrix for a number of iterations based on a difference between a previously updated reference matrix and the channel matrix for the first subcarrier to obtain a refined reference matrix; and quantizing a difference between each subsequent iteratively updated refined reference matrix and the channel matrix to generate quantization indices for the first subcarrier, wherein the initial reference matrix is initially a constant matrix. - View Dependent Claims (20, 21, 22)
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23. A method for performing differential quantization of channel information to generate a quantized differential beamforming matrix for multiple-input multiple-output (MIMO) communications over an orthogonal frequency division multiplexed (OFDM) channel, the method comprising:
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generating a candidate set of quantized beamforming matrices by rotating initial beamforming matrices in a differential codebook to center around an initial reference beamforming matrix; evaluating performance of at least some of the quantized beamforming matrices of the candidate set; selecting one of the quantized beamforming matrices of the candidate set based on the evaluated performance; and performing further iterations of the generating, evaluating and selecting using a prior selected quantized beamforming matrix from a prior iteration as a refined reference beamforming matrix for each subsequent iteration. - View Dependent Claims (24, 25, 26, 27)
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Specification