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Space-time correlated channel massive MIMO transmission method

A data transmission method and large-scale technology, applied in transmission systems, digital transmission systems, and multiple uses of transmission paths, etc., can solve problems such as system capacity reduction, downlink data that cannot be guaranteed to be non-coherent, and data interference between cells

Inactive Publication Date: 2014-02-05
BEIJING UNIV OF TECH
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Problems solved by technology

During the downlink transmission process of the system, the downlink data of adjacent cell base stations cannot guarantee non-coherent conditions, resulting in data interference between cells, which ultimately leads to a decrease in system capacity

Method used

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  • Space-time correlated channel massive MIMO transmission method
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  • Space-time correlated channel massive MIMO transmission method

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Embodiment Construction

[0083] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0084] figure 1 , figure 2 They are respectively a schematic diagram of grouping of a multi-cell Massive MIMO system and a schematic diagram of a Time-shifted pilot structure of a multi-cell Massive MIMO system according to the present invention. A full-band multiplexing wireless cellular system composed of L cells, in which there is a base station equipped with M receiving antennas in the center of each cell, and each cell contains K users, which are evenly distributed in the cell, and each user is configured with a single root antenna. Same as the multi-cell frequency reuse method (the number of cells in the frequency reuse group is N = 4), divide the L cells into 4 groups, and a certain group of cells performs pilot frequency estimation while other groups of cells perform downlink data transmission.

[0085] The flow chart of the method ...

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Abstract

The invention belongs to the field of image processing, and discloses a space-time correlated channel massive MIMO transmission method. According to the space-time correlated channel massive MIMO transmission method, a time-shifted pilot frequency system structure is adopted, a user selection scheme based on the position of a user is utilized, user sub-groups having large interference in surrounding cells are omitted, so that data interference of the adjacent cells is reduced in a channel estimation stage, meanwhile, interference among the cells is reduced in a downlink data transmission stage, and system capacity is promoted. On the basis of the user selection scheme, a Kalman estimation method is adopted, a space-time correlation between channels is used, residual interference among the cells is eliminated further, and channel estimation accuracy is promoted. By means of combination of a user selection process and Kalman channel estimation, more accurate channel estimation results are obtained under the space-time correlated channel of a multi-cell massive MIMO system, interference among the cells in a pilot frequency estimation stage is restrained, and meanwhile the throughput rate of downlink data of the system is increased.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a large-scale MIMO transmission method of a space-time correlation channel. technical background [0002] Multiple-Input Multiple-Output (Multiple-Input Multiple-Output, MIMO) is a wireless communication technology that uses multiple antennas to send and receive data in a wireless communication system. It is transmitted by multiple antennas, and the receiving end uses multiple antennas to receive. Compared with Single-Input Single-Output (SISO) communication technology, MIMO technology can use space multiplexing and space diversity to double the system capacity, improve channel reliability and reduce bit error rate. MIMO technology has been widely used in the third generation mobile communication system. Large-scale MIMO technology is also called Massive MIMO technology, which refers to increasing the number of transmitting and receiving antennas to dozens or even hundreds o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/08H04L5/00H04B7/04
Inventor 杨睿哲马大为叶斯洋张延华宗亮孙艳华
Owner BEIJING UNIV OF TECH
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