Interpolation in channel state feedback
AssigneeIntel Corporation
InventorsQinghua Li, Xintian E. Lin
Life of this patent
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Abstract
Feedback bandwidth may be reduced in a closed loop MIMO system by Householder transformations, vector quantization using codebooks, and down-sampling in the frequency domain. A column of a beamforming matrix is quantized using a codebook, a Householder reflection is performed on the beamforming matrix to reduce the dimensionality of the beamforming matrix, and the quantizing and performing of Householder reflection on the previously dimensionality reduced beamforming matrix is recursively repeated to obtain a further reduction of dimensionality of the beamforming matrix. These actions are performed for a subset of orthogonal frequency divisional multiplexing (OFDM) carriers, and quantized column vectors for the subset of OFDM carriers are transmitted.
Claims12
A method performed by a wireless station in a closed loop multiple-input-multiple-output (MIMO) wireless network, the method comprising:
- quantizing a column of a beamforming matrix using a codebook;
- performing a Householder reflection on the beamforming matrix to reduce the dimensionality of the beamforming matrix;
- recursively repeating the quantizing and performing of Householder reflection on the previously dimensionality-reduced beamforming matrix in order to obtain a further reduction of dimensionality of the beamforming matrix;
- performing the preceding actions for each carrier of a subset of OFDM carriers to obtain quantized column vectors for the subset of OFDM carriers;
- and
- transmitting the quantized column vectors for the subset of OFDM carriers.
A computer-readable medium having instructions stored thereon that when accessed result in a wireless station in a closed loop multiple-input-multiple-output (MIMO) wireless network performing:
- quantizing a column of a beamforming matrix using a codebook;
- performing a Householder reflection on the beamforming matrix to reduce the dimensionality of the beamforming matrix;
- recursively repeating the quantizing and performing of Householder reflection on the previously dimensionality-reduced beamforming matrix in order to obtain a further reduction of dimensionality of the beamforming matrix;
- performing the preceding actions for each carrier of a subset of OFDM carriers to obtain quantized column vectors for the subset of OFDM carriers;
- and
- transmitting the quantized column vectors for the subset of OFDM carriers.
Dependencies are inferred from the claim text.