Double-layer pre-coding method applicable to 3D MIMO system

A precoding and precoding matrix technology, applied in diversity/multi-antenna systems, space transmit diversity, equalizers, etc., can solve problems such as inability to improve feedback channel information, improve throughput performance, realize multi-stream transmission, reduce The effect of feedback volume

Active Publication Date: 2014-12-03
XIDIAN UNIV
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Problems solved by technology

This method can obtain a greater performance gain than method 1, but it still cannot provide perfect feedback channel information, and can only be applied to a single-stream transmission system, that is, only one signal stream can be sent at a time

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  • Double-layer pre-coding method applicable to 3D MIMO system
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  • Double-layer pre-coding method applicable to 3D MIMO system

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Embodiment Construction

[0052] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0053] The double-layer precoding method applicable to the 3D MIMO system of the present invention is based on the fact that the correlation in the vertical direction in the spatial channel is much stronger than the correlation in the horizontal direction, and the channel is precoded in the vertical direction first, The channel can achieve the best combination effect in the vertical dimension, and then perform the precoding in the horizontal direction, thus realizing the multi-stream transmission of the signal.

[0054] In the 3D MIMO system scenario to which this method is applicable, the base station uses an active antenna array system, the antenna array is a uniform planar array, and the weight and phase of each antenna element can be dynamically adjusted.

[0055] refer to figure 1 , the double-layer precoding method applicable to 3D...

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Abstract

The invention discloses a double-layer pre-coding method applicable to a 3D MIMO system. In the 3D MIMO system, an active antenna array system is adopted for a base station, a receiving terminal conducts channel estimation on a signal after receiving the signal, and a three-dimensional channel matrix is obtained; as relevancy in the vertical direction is stronger than relevancy in the horizontal direction in a channel, a vertical pre-coding matrix is designed first according to the three-dimensional channel matrix, mergence in the vertical direction is carried out on the three-dimensional channel matrix then, and a horizontal pre-coding matrix is designed next; finally, the two pre-coding matrixes are merged and fed back to the base station. The double-layer pre-coding method applicable to the 3D MIMO system has the advantages that vertical and horizontal state information in the channel is fully utilized, complexity rather than performance is reduced greatly compared with a method in which a pre-coding matrix is obtained by directly carrying out singular value decomposition on the three-dimensional channel matrix, further codebook design and limiting feedback are carried out conveniently, and performance of the system is improved largely.

Description

technical field [0001] The invention relates to a precoding method, in particular to a double-layer precoding method applicable to a 3D MIMO system, and belongs to the technical field of wireless communication. Background technique [0002] In existing cellular systems, the beam at the base station transmitter can only be adjusted in the horizontal dimension, while the vertical dimension is a fixed downtilt angle for each user. However, in real life, as the number of users increases and the radius of the cell decreases, the information on the channel vertical dimension becomes more and more important. Traditional precoding methods cannot distinguish users from the vertical dimension, and the system Performance is seriously disrupted. [0003] With the continuous development of the active antenna array system (AAS), the base station antenna can divide each antenna into several arrays in the vertical dimension without changing the antenna size, thus promoting 3D MIMO technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/01H04B7/06
Inventor 李勇朝王伟刘灿马克井文文张海林
Owner XIDIAN UNIV
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