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Achieving method for MU-MIMO precoding

An implementation method and precoding technology, applied in the field of precoding algorithms, can solve the problems of high complexity of GZI precoding method, high complexity of solving pseudo-inverse, etc.

Inactive Publication Date: 2014-07-30
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0023] Although the GZI precoding method replaces the SVD decomposition in the first step of the BD precoding method by solving the pseudo-inverse operation and QR decomposition, the complexity is reduced, but the calculation of the pseudo-inverse is still a high-complexity operation, and the two Both methods require SVD decomposition for each user's equivalent channel matrix, so the complexity of the GZI precoding method is still high

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  • Achieving method for MU-MIMO precoding
  • Achieving method for MU-MIMO precoding
  • Achieving method for MU-MIMO precoding

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[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The parameters in the examples do not affect the generality of the invention.

[0047] In order to facilitate the description and analysis of the precoding method of the present invention, the MU-MIMO system is set as follows: figure 1 As shown, the total number of transmitting antennas is greater than or equal to the total number of receiving antennas of all users, that is, N T ≥N R ; The number of data streams communicated by each user is equal to the number of receiving antennas, and the transmission power allocation of the base station adopts the average power allocation.

[0048] The signal received by any user k can be expressed as:

[0049] y k = H k W k s k + H ...

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Abstract

The invention discloses an achieving method for MU-MIMO precoding. The method includes the detailed steps that a first precoding matrix is obtained through performing improved QR decomposition on expanding matrixes H of joint channel matrixes HS of all users to eliminate multi-user interference, precoding matrixes of all the users are determined according to a QR decomposition result, and therefore calculation complexity is reduced; then a lattice reduction method is used for obtaining a second precoding matrix better in performance. Compared with a traditional MU-MIMO precoding method, the method is lower in complexity, and meanwhile system performance is improved.

Description

technical field [0001] The present invention belongs to the technical field of mobile communication, relates to multiple input multiple output (Multiple Input Multiple Output, MIMO) technology, and in particular to a precoding algorithm in a multiuser MIMO (multiuser MIMO, MU-MIMO) system. Background technique [0002] As a technology that can greatly improve the spectral efficiency of wireless communication, MIMO has received more and more attention under the background of increasingly scarce spectrum resources. 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 system. In the MU-MIMO system, the base station (Base Station, BS) sends signals to multiple users at the same time. Since multiple users share the same time-frequency resource, it will inevitably cause Multi-user Interference (MUI), which will greatly reduce the system efficiency. transmission efficienc...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L25/03H04B7/06
Inventor 方舒巫健李磊李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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