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Pre-coded vector determination method, device, base station and user terminal

A technology of precoding vector and user terminal, which is applied in the field of determining the precoding vector in base stations and user terminals, can solve the problems of multiple computing resources and consumption, and achieve the effect of realizing computing resources, simplifying applications and saving computing resources.

Active Publication Date: 2012-07-18
CHINA MOBILE COMM GRP CO LTD
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Problems solved by technology

[0006] Embodiments of the present invention provide a method and device for determining a precoding vector to solve the problem that the way of determining the precoding vector provided by the prior art consumes more computing resources

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  • Pre-coded vector determination method, device, base station and user terminal
  • Pre-coded vector determination method, device, base station and user terminal
  • Pre-coded vector determination method, device, base station and user terminal

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Embodiment Construction

[0027] In order to solve the problem that the method of determining the precoding vector provided by the prior art consumes more computing resources, the inventors analyzed the method of determining the precoding vector provided by the prior art as follows:

[0028] Precoding based on SVD decomposition is optimal, but the computational complexity of typical SVD solving algorithms (usually requiring iterations) increases as the matrix dimension increases. In the case of a large number of transmit antennas but a small number of transmission streams (in the LTE Rel. The number of transmission streams does not exceed 2), and complete SVD decomposition is not necessary, because at this time only the right singular vector corresponding to the largest n singular values ​​is required. In the enhanced multi-antenna system, if the number of receiving antennas of the user terminal is configured as 1 or 2, then regardless of the number of antennas at the transmitting end, SVD will have a cl...

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Abstract

The invention discloses a pre-coded vector determination method, a pre-coded vector determination device, a base station and a user terminal, aiming at solving the problem that many computing resources are consumed by adopting the existing pre-coded vector determination method. The method comprises the steps of: determining equivalent channel matrixes T<j> of all user terminals, and aiming at each user terminal, executing the following steps of: according to the T<j> of other user terminals, determining an interference channel matrix and executing orthogonalization processing to all row vectors in the interference channel matrix to obtain a group of standard orthogonal bases B; determining an orthogonal projection matrix of a subspace which is formed from the equivalent channel matrix of the user terminal to the interference channel matrix in a spanning way, determining the quantity of receiving antennas of the user terminal, taking the orthogonal projection matrix as a matrix to be conducted with singular value decomposition (SVD), and according to a preset corresponding relation between the quantity of the receiving antennas and simplified SVD algorithms, determining a simplified SVD algorithm corresponding to the determined quantity of the receiving antennas; and according to a right singular vector corresponding to a singular value determined based on the determined simplified SVD algorithm, determining a pre-coded vector aiming at the user terminal.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for determining a precoding vector, a base station and a user terminal. Background technique [0002] The downlink transmission scheme based on precoding is one of the core transmission schemes of the multi-antenna system. The so-called precoding means that the base station multiplies the information symbols to be transmitted by a precoding vector, and the elements in the precoding vector have a one-to-one correspondence relationship with the transmitting antennas. The precoding vector is usually obtained based on Singular Value Decomposition (SVD, Singular Value Decomposition), that is, performing SVD decomposition on the downlink Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Out-put) channel matrix H. The right singular vectors corresponding to the n largest singular values ​​directly obtain the precoding vector, where...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04B7/04
Inventor 潘成康王启星刘建军刘光毅
Owner CHINA MOBILE COMM GRP CO LTD
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