Downlink transmission method for multi-user MIMO (Multiple Input Multiple Output) system based on singular value decomposition

A singular value decomposition and downlink technology, which is applied in the downlink transmission field of multi-user MIMO systems, can solve problems such as large power control coefficient values, reduced signal-to-noise ratio of received signals, and system transmission performance degradation.

Inactive Publication Date: 2012-04-04
XIDIAN UNIV
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Problems solved by technology

However, due to the limitation of the rated transmission power of the base station transmitter, this method needs to introduce a power control coefficient. Due to the influence of the zero-forcing preprocessing matrix, the value of the power control coefficient will be large, thereby reducing the signal of the received signal. Noise ratio, leading to the decline of system transmission performance

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  • Downlink transmission method for multi-user MIMO (Multiple Input Multiple Output) system based on singular value decomposition
  • Downlink transmission method for multi-user MIMO (Multiple Input Multiple Output) system based on singular value decomposition
  • Downlink transmission method for multi-user MIMO (Multiple Input Multiple Output) system based on singular value decomposition

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[0056] The transmission method of the present invention will be described in further detail below with reference to the accompanying drawings.

[0057] refer to image 3 , the system used in the present invention is a multi-user MIMO system, which consists of a base station and L users. Among them, the base station is equipped with M downlink transmitting antennas, and the kth user is equipped with N k Root downlink receiving antenna, 1≤k≤L. The present invention assumes that the wireless channel between the m-th transmitting antenna of the base station and the i-th receiving antenna of the k-th user is a Rayleigh fading channel, and each channel is independent of each other. image 3 in, x k is the information symbol vector sent to the kth user, β is the power adjustment matrix, τ is the disturbance coefficient quantity, ω is the disturbance vector, P is the preprocessing matrix, G k is the post-processing matrix of the kth user receiving end, is the post-processed si...

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Abstract

The invention discloses a downlink transmission method for a multi-user MIMO (Multiple Input Multiple Output) system based on singular value decomposition, which mainly solves the problem on poor transmission performance caused by low signal-to-noise ratio of the receiving end in existing transmission method. The method is realized by the following steps of: (1) writing an information symbol sent by a base station into a column vector, creating a power adjustment matrix, and determining a disturbance coefficient vector; (2) creating a preprocessing matrix for removing multi-user interference; (3) determining an optimal disturbance vector and a power control coefficient; (4) generating a sent signal from the base station end and sending the signal; (5) receiving the signal by the user end; (6) creating a post-processing matrix for post-processing of the received signal; (7) carrying out a mode operation on the post-processed signal; and (8) judging and outputting the signal after the mode operation. The method provided by the invention improves the transmission performance of the system by increasing the signal-to-noise ratio of the receiving end and can be applied to the downlink transmission of the multi-user MIMO system.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to downlink information transmission in a multi-user MIMO system, in particular to a downlink transmission method of a multi-user MIMO system assisted by vector perturbation based on singular value decomposition. Background technique [0002] In a wireless communication system, in order to meet the increasing demand for high-speed data transmission, it can be realized by configuring multiple antennas at the base station and the user end, thus forming a MIMO system with multiple inputs and multiple outputs. Compared with the single-user MIMO system, the multi-user MIMO system can better improve the system capacity and spectrum efficiency by utilizing the diversity gain of multiple users and the diversity gain and multiplexing gain of multiple antennas. [0003] For the downlink transmission of a multi-user MIMO system, there is multi-user interference in the system. This require...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B7/06
Inventor 刘伟李川李建东宋利娜黄鹏宇刘勤张文柱盛敏李红艳
Owner XIDIAN UNIV
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