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Methods and apparatuses for transmitting coding indication information and determining precoding matrix

A technology of precoding matrix and indication information, applied in the field of communication, can solve the problem that the resolution of codeword cannot be adjusted flexibly

Active Publication Date: 2016-03-30
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Embodiments of the present invention provide a method and device for transmitting encoding indication information and determining a precoding matrix, which are used to solve the problem that the resolution of codewords cannot be flexibly adjusted in a codebook generated by using DFT beam vector subgroups combined with column selection

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  • Methods and apparatuses for transmitting coding indication information and determining precoding matrix
  • Methods and apparatuses for transmitting coding indication information and determining precoding matrix
  • Methods and apparatuses for transmitting coding indication information and determining precoding matrix

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Embodiment Construction

[0090] In a multi-antenna system based on linear precoding, the receiver selects an appropriate precoding matrix from a pre-defined set of precoding matrices according to channel information, and feeds back the index corresponding to the selected precoding matrix to the transmitter. This collection is called a codebook. The transmitter determines the corresponding precoding matrix according to the received index, and uses it to properly preprocess the transmitted signal, so as to improve the effectiveness and reliability of information transmission. A codebook is a necessary element to enable this process. The codebook design needs to match the channel distribution characteristics as much as possible and minimize the performance loss caused by codebook quantization. The embodiment of the present invention provides a method for generating a codebook using interpolation under a MIMO channel, which solves the problem that the resolution of codewords cannot be flexibly adjusted i...

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Abstract

The invention discloses methods and apparatuses for transmitting coding indication information and determining a precoding matrix. With the methods and apparatuses, the resolution ratio of the code word in the codebook that is generated based on combination of a wave beam vector subgroup with column selection can not be adjusted flexibly. The method comprises: first precoding indication information and second precoding indication information are determined, wherein the first precoding indication information corresponds to a first-stage precoding matrix and the second precoding indication information corresponds to direction weighting vectors for carrying out interpolation processing on parts representing corresponding angles of the wave beam vectors in all wave beam vectors at each polarization direction in the first-stage precoding matrix and phase adjusting factors applied to different polarization directions of the first-stage precoding matrix. And the first-stage precoding matrix, the direction weighting vectors, and the phase adjusting factors are used for generating a precoding matrix. With the direction weighting vectors, the resolution rate of the precoding matrix can be adjusted flexibly.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for transmitting encoding instruction information and determining a precoding matrix. Background technique [0002] Currently, in an LTE (Long Term Evolution, long-term evolution) system, a precoding codebook is mainly based on a DFT (Discrete Fourier Transform, discrete Fourier transform) vector, and a two-stage codebook structure is used. Taking the 8-antenna codebook in Rel-12 as an example, the first stage determines a DFT beam vector subgroup, and the terminal indexes the beam vector subgroup in all beam vector subgroup sets, that is, PMI1 (PrecodingMatrixIndicator, precoding matrix indication) to the eNB; the second stage performs column selection on the DFT beam vector subgroup, selects one column or several columns and performs phase adjustment between polarization directions, and the terminal selects and adjusts the phase in all possibl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0456H03M1/26H04B7/0619H04L25/03898H04B7/0617
Inventor 李辉陈山枝高秋彬陈润华陈文洪拉盖施
Owner DATANG MOBILE COMM EQUIP CO LTD
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