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A precoding method and device

A technology of precoding and precoding matrix, applied in diversity/multi-antenna systems, space transmit diversity, electrical components, etc., can solve the problems of limited accuracy and large cost of precoding feedback resources in analog domain, and achieve high accuracy. Deficiencies, reduced feedback overhead, effects of reduction and delay

Active Publication Date: 2020-02-18
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 limited under the scheme adopted in practice, and if the accuracy needs to be improved, the resource overhead of analog domain precoding feedback is relatively large

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  • A precoding method and device
  • A precoding method and device

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Embodiment Construction

[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 present invention discloses a precoding method and device. The method comprises: outputting an approximation channel h at a terminal; assessing each codebook vector in a codebook according to the approximation channel h, wherein the codebook is a codebook known to both a base station and the terminal; and feeding the codebook vectors back to the base station according to the assessment result. The base station side receives the codebook vectors fed back by the terminal, and said codebook vectors are obtained from assessing, by a terminal, codebook vectors in a codebook according to an approximation channel h. A precoding matrix in the analog domain is formed by the codebook vectors, and an equivalent channel is acquired according to the precoding matrix in the analog domain. By employing the present invention, a terminal can dynamically adjust the number of fed-back codebook vectors, and adapt to base stations having different numbers of digital channels, thus fully utilizing all digital channel resources. In addition, precision of analog and digital precoding during processing of analog-digital two-stage precoding can be improved, and the cost of channel feedback is 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 resources brought by a large number of CSI-RS (channel state information reference signal, channel state information reference signal) Overhead, 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 r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0452H04B7/0456H04B7/04
Inventor 任余维苏昕
Owner DATANG MOBILE COMM EQUIP CO LTD
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