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Radio frequency and base band mixing pre-coding method for 3D (three dimensional)-MIMO (Multiple Input Multiple Output) system

A 3D-MIMO and precoding technology, applied in the field of wireless communication, can solve problems such as low implementation cost and low feedback load

Inactive Publication Date: 2015-04-08
XIDIAN UNIV
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Problems solved by technology

[0007] In order to solve the technical problems existing in the existing 3D-MIMO system performance improvement method, the present invention provides a 3D-MIMO system radio frequency and baseband hybrid precoding method, which has the advantages of user-level alignment, low feedback load and low implementation cost Etc

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  • Radio frequency and base band mixing pre-coding method for 3D (three dimensional)-MIMO (Multiple Input Multiple Output) system
  • Radio frequency and base band mixing pre-coding method for 3D (three dimensional)-MIMO (Multiple Input Multiple Output) system
  • Radio frequency and base band mixing pre-coding method for 3D (three dimensional)-MIMO (Multiple Input Multiple Output) system

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Embodiment Construction

[0068] In order to facilitate the understanding of the purpose, technical solutions and effects of the present invention, the present invention will now be further described in detail in conjunction with examples.

[0069] This embodiment provides a radio frequency and baseband hybrid precoding method for a 3D-MIMO system. Considering the downlink single-user scenario, the base station is configured with a uniform rectangular array, assuming that the array elements are arranged as N az Column N el row, that is, the number of base station antennas is N t =N el ×N az , the number of RF chains is The number of downlink data streams is The number of antennas at the user end is N r . In order not to lose generality, it is assumed that the number of antennas at the user end is N r =1.

[0070] Such as figure 1 As shown, the implementation steps of the radio frequency and baseband hybrid precoding method of the 3D-MIMO system are as follows:

[0071] Step 1, channel esti...

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Abstract

The invention discloses a radio frequency and base band mixing pre-coding method for a 3D-MIMO system. The method includes the steps of 1) estimating a channel and calculating a correlation matrix; 2) constructing a radio frequency pre-coding codebook; 3) calculating and feeding back radio frequency pre-coding code words; 4) calculating and feeding back base band pre-coding code words; 5) transmitting downlink data. The radio frequency and base band mixing pre-coding method for the 3D-MIMO system is directed to channel characteristics of the3D-MIMO system to achieve user-level beam alignment, uses long-cycle and short-cycle feedback strategies to reduce the amount of real-time feedback and greatly reduce the burden on the uplink, reduces the number of radio frequency chains for reducing the cost, is easy to operate and can be applied to an actual communication system easily.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a precoding method, in particular to a radio frequency and baseband hybrid precoding method of a 3D-MIMO system. Background technique [0002] In recent years, with the rapid development of the mobile Internet, users' demand for data transmission rates has also increased dramatically. In terms of network capacity, the fifth-generation mobile communication technology is committed to achieving the goal of "a thousand times in ten years". To achieve this goal, 3D-MIMO (Three Dimension Multiple-Input Multiple-Output, three-dimensional multiple-input multiple-output) technology has attracted much attention as one of the key technologies. [0003] The 3D-MIMO system increases the use of channel information in the vertical dimension, which can not only greatly improve the average throughput of the system, but also improve the service quality of cell edge users. The 3D-MIM...

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Application Information

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IPC IPC(8): H04L1/00H04B7/04
CPCH04B7/0456H04B7/0663H04L1/0001
Inventor 李勇朝刘灿井文文王伟韩萍马克
Owner XIDIAN UNIV
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