Method for determining pre-coding matrix and corresponding communication method and equipment

一种预编码矩阵、子带预编码的技术，应用在多天线技术中的预编码领域，能够解决性能差强人意等问题

Active Publication Date: 2012-04-04
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

Not only does this bring some overhead, but the performance of the proposal is somewhat unsatisfactory

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  • Method for determining pre-coding matrix and corresponding communication method and equipment
  • Method for determining pre-coding matrix and corresponding communication method and equipment
  • Method for determining pre-coding matrix and corresponding communication method and equipment

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Embodiment Construction

[0023] Firstly, the codebook design according to the present invention will be described below.

[0024] First take MIMO for M transmit antennas with a uniform linear array (ULA) as an example. code word W 1 ∈C 1 Corresponding to broadband and / or long-term channel characteristics, and denoted W 2 ∈C 2 Corresponds to frequency selection and / or short-term channel characteristics. W 1 The number of codebook C 1 The size of is recorded as p; W 2 The number of codebook C 2 The size of is recorded as q. The form of the precoding matrix for the subband is W=W 1 W 2 . For closely spaced ULAs (for example, the modulus of the correlation coefficient of the antennas is greater than a predetermined threshold, or the distance between the antennas is less than or equal to 1 / 2 times the signal wavelength), the main eigenvector of the channel matrix can be approximated as a DFT vector. Therefore, the present invention proposes for W 1 and W 2 The codeword, so that W is an M × 1 ...

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Abstract

The invention relates to a method for determining a pre-coding matrix for sub-band pre-coding of a transmitter, wherein the transmitter is provided with M transmitting antennas. The method comprises the steps of: a. determining a first optimal matrix W1 according to the relevant information of a broadband and / or a longtime information channel, wherein the first matrix W1 corresponds to the characteristics of the broadband and / or the longtime information channel; b. multiplying the first optimal matrix W1 and each second matrix W2 in a second codebook so as to obtain a plurality of alternative pre-coding matrixes, wherein the second matrix W2 corresponds to the frequency choice and / or the characteristics of a short-time information channel; and c. selecting the optimal matrix from the plurality of alternative pre-coding matrixes according to the frequency choice and / or the status information of the short-time information channel for pre-coding the data to be transmitted. The method is characterized in that the number of DFT (Discrete Fourier Transform) wave beams is increased, thereby improving the spatial resolution; a diagonal matrix is introduced into the first matrix W1; the phase adjustment is introduced into the second matrix W2; and adjusted phases are ensured to be uniformly distributed in the whole phase space.

Description

technical field [0001] The present invention relates to multi-antenna technology, in particular to a precoding method in multi-antenna technology. Background technique [0002] According to the currently industry-agreed LTE-A Release 10 (Rel-10) standard (R1-101683), subband precoding consists of two precoding matrices, one of which corresponds to wideband and / or long-term Channel characteristics, the matrix is ​​denoted as W 1 ; while another precoding matrix corresponds to frequency selection and / or short-term channel characteristics, which is denoted as W 2 . The product of these two matrices is used as a precoding matrix for precoding data. [0003] In proposal R1-105011, a two-stage feedback method is proposed, where W 1 is a matrix with dimension M×Nb, W 2 is a matrix of dimension Nb×r. In the proposal to W 2 In the codebook design of , there is a phase modulation factor to try to match the phases of antennas 1 to M / 2 and the phases of antennas M / 2 to M. In tur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
CPCH04B7/0426H04B7/0456H04B7/0617H04B7/0469H04L25/03343H04B7/0626H04B7/065
Inventor 武露陈晋辉宋扬杨红卫吕荻刘皓
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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