US 9,178,591 B2Granted

Codebook subsampling for PUCCH feedback

AssigneeMarvell World Trade Ltd.

InventorsKrishna Srikanth Gomadam, Adoram Erell

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Abstract

A method in a mobile communication terminal includes holding a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal. The precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a long-term sub-codebook and a short-term sub-codebook. The definition defines a first subset of the long-term sub-codebook and a second subset of the short-term sub-codebook. A Multiple-Input Multiple-Output (MIMO) signal is received in the terminal via multiple receive antennas. Based on the received MIMO signal, a precoding matrix is selected from the sub-sampled codebook for precoding subsequent MIMO signals transmitted to the terminal. The precoding feedback indicating the selected precoding matrix is calculated.

Claims20

Dependent claims

A method, comprising:

in a mobile communication terminal, holding a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal, wherein the precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a first sub-codebook and a second sub-codebook, wherein the first sub-codebook represents a first precoding component and the second sub-codebook represents a second precoding component that varies more rapidly than the first precoding component, and wherein the definition defines a first subset of the first sub-codebook and a second subset of the second sub-codebook;
receiving in the terminal a Multiple-Input Multiple-Output (MIMO) signal via multiple receive antennas;
and
based on the received MIMO signal, selecting from the sub-sampled codebook a precoding matrix for precoding subsequent MIMO signals transmitted to the terminal, by combining a first matrix selected from the first sub-codebook and a second matrix selected from the second sub-codebook, and calculating the precoding feedback indicating the selected precoding matrix.

1 more element

Apparatus, comprising:

a memory, which is configured to hold a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal, wherein the precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a first sub-codebook and a second sub-codebook, wherein the first sub-codebook represents a first precoding component and the second sub-codebook represents a second precoding component that varies more rapidly than the first precoding component, and wherein the definition defines a first subset of the first sub-codebook and a second subset of the second sub-codebook;
a receiver, which is configured to receive a Multiple-Input Multiple-Output (MIMO) signal via multiple receive antennas;
and
processing circuitry, which is configured to select from the sub-sampled codebook a precoding matrix for precoding subsequent MIMO signals, by combining a first matrix selected from the first sub-codebook and a second matrix selected from the second sub-codebook, and to calculate the precoding feedback indicating the selected precoding matrix.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 14/296,474Filed 5 Jun 2014 · continuation
Priority: 6 Oct 2010
Published: US 2014/0286452 A125 Sep 2014
Granted: 3 Nov 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04B 7/0481
Special codebook structures directed to feedback optimisation: using subset selection of codebooks
H04B 7/0417
MIMO systems: feedback systems
H04B 7/0487
Taking channel rank into account: codebooks having a nested structure
H04B 7/0639
Feedback format: using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Family

Application61/390,511Us provisional application · filed 6 Oct 2010
Application61/392,431Us provisional application · filed 12 Oct 2010
Application13/252,218Parent of this continuation · filed 4 Oct 2011
US 2014/0286452 A1Pre-grant publication · published 25 Sep 2014
US 8,750,404 B2Parent of this continuation
US 2012/0087425 A1Published application
US 9,178,591 B2This patent

From the US filing history. Foreign family members aren’t listed.