Samsung Electronics Co., Ltd.

Qi Zhan

Hongbing Cheng

Kee-Bong Song

Hyukjoon Kwon

Yanru Tang

Jung Hyun Bae

Dongwoon Bai

Federico Penna

Mehdi Ganji

A method may include determining, for a channel, a target component of precoding information, determining at least a part of the precoding information based on the target component and a decompressed component of the precoding information, and sending, from a user equipment, the at least a part of the precoding information. Determining the at least a part of the precoding information may be based on a correlation between the target component and the decompressed component. The at least a part of the precoding information may include a vector of coefficients. The vector of coefficients may include a vector of complex numbers. At least one of the complex numbers may include an amplitude representing a scaling coefficient and a phase representing a rotation coefficient. The target component may include a target matrix. The decompressed component may include a decompressed matrix. The target matrix may include a linear combination coefficients matrix. The precoding information may include a precoding matrix indicator.

Systems, methods, and apparatus for determining precoding information for beamforming

Low-complexity methods of calculating a precoding matrix for use in MIMO transmission. In some embodiments, a method of calculating a precoding matrix includes (i) calculating a first portion of a first singular value decomposition, based on a first portion of a channel matrix; (ii) calculating a second portion of a second singular value decomposition, based on a second portion of the channel matrix; (iii) calculating an intermediate matrix, based on: the first portion of the first singular value decomposition and the second portion of the second singular value decomposition; and (iv) calculating a matrix of approximate right singular vectors. The calculating of the matrix of approximate right singular vectors may include calculating a product of factors, the factors including a first factor based on the conjugate transpose of the intermediate matrix, a second factor based on a unitary matrix, and a third factor based on a diagonal matrix.

Low complexity algorithms for precoding matrix calculation

A method and system analog beamforming for a single-connected antenna array is herein disclosed. A method includes estimating analog channels on a per-antenna basis, calculating explicitly an analog beamforming matrix based on the estimated analog channels, and performing analog beamforming based on the calculated analog beamforming matrix.

System and method for analog beamforming for single-connected antenna array

Disclosed is an apparatus and a method of deriving an optimal precoder, in which a precoder is derived using water filling power allocation, and then is multiplied with some unitary matrix satisfying certain conditions to meet a per layer power constraint. Since the multiplication with the unitary matrix does not change the capacity, the derived precoder is optimal in achieving maximum capacity in a multiple input multiple output (MIMO) wireless communication scheme.

Optimal precoder method and apparatus with equal power allocation

An apparatus and method for dynamically selecting a beamforming codebook and hierarchically generating beamforming codebooks is provided. According to one embodiment, an apparatus includes a channel estimation processor configured to receive a signal using a current beamforming codebook in a current beam sweeping period; a look-up table configured to store a plurality of beamforming codebooks; a state abstraction processor connected between the channel estimation processor and the look-up table, and configured to determine a codebook index based on a current channel condition as a function of the received signal and the current beamforming codebook, and select one of the plurality of beam sweeping codebooks in the look-up table as the beamforming codebook for the next beam sweeping period based on the codebook index.

Apparatus and method for dynamically selecting beamforming codebook and hierarchically generating beamforming codebooks

A method and system for selecting precoding matrix index are herein disclosed. The method includes determining a precoder and candidate beams, selecting base beams based on a correlation power between the determined precoder and determined candidate beams, and estimating amplitude coefficients and cophase coefficients by projecting a channel on the selected base beams.

Eigenvalue decomposition precoding matrix index selection

A method of designing a codebook for analog beamforming. In some embodiments, the method includes: generating a plurality of training points, based on a predefined distribution, each training point being a channel vector; generating, for each of a plurality of codewords, a respective initial value; assigning, in a first assignment operation, each of the training points to a respective desired codeword, the desired codeword maximizing a metric function of a beamforming gain for the training point over the codewords; updating, in a first updating operation, each of the codewords according to the training points assigned to it; and determining whether convergence is achieved; and in response to determining that convergence is achieved, determining a final codebook.

System and method for generating codebook for analog beamforming

A method and system for selecting precoding matrix index are herein disclosed. The method includes determining a precoder and candidate beams, selecting base beams based on a correlation power between the determined precoder and determined candidate beams, and estimating amplitude coefficients and cophase coefficients based on a correlation between the determined precoder and the selected base beams.

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San Diego, CA, United States of America

Qi Zhan