Method for multi-user dispatching transmission based on 3D-MIMO codebook design

A technology of multi-user scheduling and transmission method, applied in the field of wireless communication, can solve the problems of small adjustable range, uneven distribution, unsuitable DFT codebook, etc.

Active Publication Date: 2014-05-07
上海瀚芯实业发展合伙企业(有限合伙)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the angle adjustable range of the beam in the vertical direction is small, and the distribution is not uniform
Therefore, the DFT codebook is not suitable for beamforming in the vertical direction

Method used

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  • Method for multi-user dispatching transmission based on 3D-MIMO codebook design
  • Method for multi-user dispatching transmission based on 3D-MIMO codebook design
  • Method for multi-user dispatching transmission based on 3D-MIMO codebook design

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Experimental program
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Effect test

Embodiment 1

[0062] Embodiment 1: Set the phase difference between the antenna elements according to the desired direction of the beam , for the same vertical codeword, the phase difference between each antenna element It is fixed. The basic idea is that the vertical codebook divides the cell into equidistant rings. Assume that the number of array elements in the vertical and horizontal directions is N respectively. tv and N th Uniform plate array structure, let the vertical codebook include N V vertical codewords, N V vertical codewords to divide the cell into N V an equidistant ring, and the beam of each vertical codeword points to a center of the ring, such as image 3 As shown, for the mth vertical codeword, calculate the downtilt angle of the mth ring center relative to the base station antenna:

[0063] θ m = arctan ( S m ...

Embodiment 2

[0071] Embodiment 2: the vertical codeword in Embodiment 1, the phase difference between its antenna array elements It depends on the desired direction of the beam. For the same vertical codeword, the phase difference between the antenna elements is fixed, which essentially adjusts the sampling method of the DFT codebook to make it more suitable for the actual environment. In the first embodiment, the base station antenna UPA array is considered as a whole to design the codebook. In fact, each array element in the vertical direction of the base station has its own position. If the phase of the code word is determined by considering the specific positions of different array elements when designing the codebook, the directivity of the beam can be made more accurate. Based on this idea, the first embodiment is slightly improved, and another vertical codebook design scheme is proposed.

[0072] Same as Embodiment 1, assume that the vertical codebook includes N V vertical code...

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Abstract

The invention discloses a method for multi-user dispatching transmission based on 3D-MIMO codebook design. The method comprises the steps that an even flat board array is adopted by a base station antenna, a direct product codebook for 3D-MIMO is adopted, a horizontal codebook in the direct product codebook is a DFT codebook, and a vertical codebook is obtained through space division; the codebooks are grouped according to basic beam directional diagrams corresponding to codons in the direct product codebook, and the limiting feedback quantity is calculated by users according to the codebook grouping condition and a channel estimation result and is fed back to a base station through a feedback channel; the users are paired and dispatched by the base station according to the limiting feedback quantity of the users and multi-user transmission is conducted. Compared with a two-dimension codebook, a traditional three-dimensional DFT direct product codebook and multi-user transmission methods of the two-dimension codebook and the traditional three-dimensional DFT direct product codebook, the use rate of a system frequency spectrum and the handling capacity performance are improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a 3D-MIMO-oriented codebook design method and a limited feedback multi-user scheduling transmission method. Background technique [0002] Multi-user MIMO technology makes full use of the spatial freedom provided by multiple antennas, and effectively improves the average throughput of the system through time-frequency resource multiplexing. Such as figure 1 As shown in (a), when the base station adopts the uniform linear array ULA structure, the downtilt angle of the beam is fixed, and the beamforming can only be performed in the horizontal two-dimensional plane; as figure 2 As shown in (a), it can distinguish users with different horizontal angles, but cannot distinguish between two users with the same horizontal angle and different distances. Such as figure 1 As shown in (b), when the base station adopts the uniform panel array UPA, the degree of freedom in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04B7/04
Inventor 黄永明张帆何世文范立行金石杨绿溪
Owner 上海瀚芯实业发展合伙企业(有限合伙)
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