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A 3d MU‑MIMO Precoding Method Based on Orthogonal Joint Codebook Set

A precoding and precoding vector technology, applied in the field of precoding, can solve the problems of not considering three-dimensional spatial characteristics, limited CCI suppression ability, etc., and achieve the effect of suppressing co-channel interference, improving overall performance, and strong precoding gain.

Active Publication Date: 2017-05-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the 3D precoding scheme, both the horizontal dimension and the vertical wiki use the same DFT codebook, and the three-dimensional space characteristics are not considered at all, resulting in limited suppression of CCI

Method used

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  • A 3d MU‑MIMO Precoding Method Based on Orthogonal Joint Codebook Set
  • A 3d MU‑MIMO Precoding Method Based on Orthogonal Joint Codebook Set
  • A 3d MU‑MIMO Precoding Method Based on Orthogonal Joint Codebook Set

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Embodiment Construction

[0021] The present invention is described below in conjunction with specific examples.

[0022] figure 1 It is a system block diagram of the 3D MU-MIMO precoding method based on the orthogonal joint codebook set in the present invention. The base station adopts an n×m-dimensional planar antenna array structure, where n represents the number of rows of the planar antenna array, m represents the number of columns of the planar antenna array, and n=m. Each transmitting antenna is required to be able to process information in the horizontal and vertical dimensions at the same time. The number of receiving antennas at the user end is represented by r. The signal received by the jth user can be expressed as:

[0023]

[0024] The received signal consists of three parts, among which, H j W j x jIndicates the useful signal part received by the receiver, Indicates the interference received by j users from other user signals, and nj represents the noise signal, which is subje...

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Abstract

The invention discloses a 3D (three-dimensional) MU-MIMO (multiple user-multiple input multiple output) precoding method based on an orthogonal joint codebook set, and relates to the technical field of mobile communication. The method comprises the following steps of enabling a base station terminal to adopt a uniform surface antenna matrix, and simultaneously store the orthogonal joint codebook set together with a user terminal; according to a 3D MIMO channel matrix, enabling the user terminal to select the optimum precoding vector in the horizontal dimension and the vertical dimension; feeding the corresponding number of the precoding vector back to the base station terminal, enabling the base station terminal to form a 3D precoding matrix, and sending signals to a plurality of users to carry out the 3D precoding processing. The method has the advantages that the orthogonal joint codebook set covers larger space, and the orthogonality is formed between the codebooks, so the matching of the 3D MIMO channel is more accurate and comprehensive, and the interference of MU channel sharing is effectively inhibited; meanwhile, by selecting the optimum precoding matrix, under the condition of not increasing the feedback amount, the channel information in the horizontal dimension and the vertical dimension are comprehensively utilized, and the integral property of the system is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, and mainly proposes a precoding method for LTE-Advanced system 3D MU-MIMO. Background technique [0002] As the core technology of LTE-Advanced and LTE air interface-MIMO technology, it can improve the system capacity without increasing the bandwidth and transmission power, mainly through the effective combination of time domain and space domain through multiple antennas distributed in space. The received signal is processed, and at the same time, the multipath propagation characteristics and random fading characteristics of the channel are used to effectively improve the transmission quality and increase the transmission rate. [0003] However, in an actual working environment, the embodiment of the advantages of MIMO technology greatly depends on the characteristics of the MIMO channel model. Therefore, it is very important to establish a channel model that can effectively refle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 景小荣张靖悦
Owner CHONGQING UNIV OF POSTS & TELECOMM
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