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A precoding method based on khatri‑rao product 3d MU‑MIMO

A precoding and 3D technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve the problem of limited multi-user co-channel interference CCI suppression ability

Active Publication Date: 2017-03-08
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At the 34th meeting of the 3GPP project team, Xidian proposed a 3D precoding scheme based on point multiplication. Compared with the traditional 2D precoding scheme, this scheme can improve the system performance in a strongly correlated environment to a certain extent. However, the ability to suppress multi-user co-channel interference CCI (CoherentChannelInterference) is limited

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  • A precoding method based on khatri‑rao product 3d MU‑MIMO
  • A precoding method based on khatri‑rao product 3d MU‑MIMO
  • A precoding method based on khatri‑rao product 3d MU‑MIMO

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Embodiment Construction

[0017] figure 1 It is a system block diagram of the downlink 3D MU-MIMO precoding proposed by the present invention. The base station adopts an M×N dimensional uniform array, where M represents the number of rows of the uniform array, and N represents the number of columns of the uniform array. Each transmitting antenna is required to be able to process information in the horizontal and vertical dimensions at the same time. There are K users at the end, and the number of receiving antennas for each user is N rIndicates that after receiving the signal, the UE performs channel estimation to obtain a 3D channel matrix

[0018] To simplify the analysis, assuming that the channel fading is flat, the signal received by the kth user can be expressed as:

[0019]

[0020] in Indicates the expected signal of the kth receiver, Indicates the interference received by the kth user from other user signals, is the transmit power of user k, is the transmit power of other users ...

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Abstract

The invention provides a precoding method applicable to a three-dimensional multi-user multi-input and multi-output system, and belongs to the technical field of wireless communication. Each user selects a precoded codon for obtaining the maximal channel gain by each user according to corresponding horizontal dimensional and vertical dimensional channel state information (CSI), and then feeds an index corresponding to the optimal codon back to a base station terminal; the base station terminal restores the corresponding horizontal dimensional and vertical dimensional precoded codons according to the received feedback information, so as to structure a 3D precoded matrix on the basis of the Khatri-Rao product. Thus, the precoding treatment on the data transmitted by each user is achieved. By adopting the precoding code book construction method proposed by the invention, not only is the precoding code book better matched with the current channel space, but also multi-user cochannel interference CCI can be effectively restrained. Therefore, a simple and efficient implementation scheme is provided for downlink 3DMU-MIMO precoding.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to the technical field of long-term evolution of mobile communication (LTE-Advanced). Background technique [0002] With the deepening of multi-antenna technology research, MIMO technology has been extended from point-to-point single-user system to point-to-multipoint multi-user MIMO system. In an actual working environment, the advantages of MIMO technology greatly depend on the MIMO channel model. The traditional MIMO system only uses the channel information in the horizontal dimension, which cannot meet the user's requirements for higher data transmission rate and higher spectral efficiency. Therefore, a new antenna design is required to develop and utilize the channel in the vertical dimension, namely 3D MU-MIMO (3-DimensionMulti-User Multiple Input Multiple Output,) MIMO three-dimensional multi-user multiple input multiple output). After the introductio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 景小荣吴学文陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM
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