Pre-coding method and device

A technology of precoding and precoding matrix, which is applied in the field of precoding methods and devices, can solve the problems of high resource overhead and limited accuracy of precoding in the analog domain, so as to reduce feedback overhead, make up for the lack of accuracy, reduce and delayed effect

Active Publication Date: 2017-01-11
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0005] In the existing technology, the digital-analog hybrid precoding has at least the following disadvantages: the accuracy of analog domain precoding is limi

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[0057] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0058] The inventor noticed during the invention that:

[0059] In view of the important role of MIMO (Multiple Input Multiple Output) technology in improving peak rate and system spectrum utilization, LTE (Long Term Evolution, long-term evolution) / LTE-A (LTE-Advanced, long-term evolution upgrade) etc. Wireless access technology standards are all built on the basis of MIMO+OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology. The performance gain of MIMO technology comes from the spatial freedom obtained by multi-antenna systems. Therefore, one of the most important evolution directions of MIMO technology in the standardization development process is the expansion of dimensions.

[0060] In order to further improve the MIMO technology, a massive antenna technology (Massive MIMO) is introduced into the...

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Abstract

The invention discloses a pre-coding method and device. The method comprises: an approximate channel h is outputted at a terminal; according to the approximate channel h, each codebook vector in a codebook is evaluated, wherein the codebook is one known by a base station and the terminal; and on the basis of the evaluation result, the codebook vectors are fed back to the base station. The base station side receives the codebook vectors fed back by the terminal, wherein the codebook vectors are obtained by evaluation on the codebook vectors in the codebook based on the approximate channel h; an analog pre-coding matrix is formed based on the codebook vectors; and an equivalent channel is obtained according to the analog pre-coding matrix. Therefore, the terminal can adjust the number of the fed-back codebook vectors dynamically to realize adaption to base stations with different digital channel numbers, so that all digital channel resources can be utilized fully. Moreover, analog and digital pre-coding precision during the analog-digital two-stage pre-coding process can be improved and the channel feedback costs are reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a precoding method and device. Background technique [0002] In order to reduce the implementation cost and equipment complexity of Massive MIMO technology, as well as reduce the transmission rate requirements brought by a large number of transceivers and the resource overhead brought by a large number of CSI-RS (channel state information reference signal, channel state information reference signal) In recent years, it has been proposed to use digital-analog hybrid precoding technology. [0003] figure 1 It is a schematic diagram of the digital-analog hybrid precoding structure, as shown in the figure, the so-called digital-analog hybrid precoding refers to the traditional DBF (Digital Beam Forming, digital beam forming) digital domain precoding D basis, in the vicinity of the antenna system At the front end, a level of analog precoding A is added to a ra...

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Application Information

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IPC IPC(8): H04B7/04
CPCH04B7/0452H04B7/0456H04B7/04
Inventor 任余维苏昕
Owner DATANG MOBILE COMM EQUIP CO LTD
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