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Adaptive downlink transmission method of fd-mimo based on two-layer precoding

An adaptive transmission and precoding technology, which is applied in the transmission system, digital transmission system, radio transmission system, etc., can solve the problems of channel feedback overhead reduction and loss of system performance, and achieve low complexity, small amount of channel information, and realization of The effect of channel feedback overhead

Active Publication Date: 2021-04-23
SOUTHEAST UNIV
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Problems solved by technology

However, using this method is at the cost of loss of system performance in exchange for reduction of channel feedback overhead

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  • Adaptive downlink transmission method of fd-mimo based on two-layer precoding
  • Adaptive downlink transmission method of fd-mimo based on two-layer precoding
  • Adaptive downlink transmission method of fd-mimo based on two-layer precoding

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Embodiment Construction

[0051] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0052] Considering a multi-user downlink, the base station uses a uniform planar antenna array, including M rows of antenna arrays in the vertical direction, and N array elements in each row in the horizontal direction, and each row and column of antenna elements form a uniform linear antenna array. The spacing between adjacent antenna elements in the vertical direction is half of the carrier wavelength. The total number of users is U, each user is configured with a single receiving antenna, and the base station can serve up to K users. The base station knows the statistical channel information of U users, where k=1, 2,..., U, the statistical channel information ...

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Abstract

The invention discloses a FD-MIMO downlink adaptive transmission method based on two-layer precoding, which includes the following steps: firstly, user scheduling is performed by using statistical channel information of users; Grouping; two-layer precoding transmission is performed on the grouped users. The outer precoding matrix only depends on the user's statistical channel information, and users in the same group use the same outer precoding matrix, and the inner precoding matrix depends on each Equivalent channel information of users in the group. The present invention can effectively reduce the interference between users, and can obtain higher system throughput with lower computational complexity and channel information feedback, which is easy to implement; by setting the parameters of user grouping, the base station can be flexibly adjusted for downlink The amount of channel state information required for transmission achieves a trade-off between channel information acquisition overhead and system performance.

Description

technical field [0001] The invention relates to an adaptive transmission technology based on a two-layer precoding downlink Full-Dimension Multiple-Input Multiple-Output (Full-Dimension Multiple-Input Multiple-Output, FD-MIMO) system, belonging to the technical field of wireless communication. Background technique [0002] With the demand for higher spectrum efficiency and energy efficiency of communication systems, the massive MIMO wireless transmission technology that deploys a large number of antennas at the base station has been extensively studied. However, in practical applications, it is difficult to deploy large-scale antennas in conventional uniform linear arrays due to the limitation of the physical space of the base station. In order to solve this problem, in recent years, it has been proposed to configure a two-dimensional grid-arranged antenna array at the base station, called FD-MIMO technology, which can overcome the limitation of limited space on massive MIMO...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04L5/00
CPCH04B7/0456H04L5/0048
Inventor 李潇刘泽宇金石
Owner SOUTHEAST UNIV
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