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Singular value decomposition-based method for uplink transmission of multi-user MIMO (Multiple-Input Multiple-Output) system

A technology of singular value decomposition and link transmission, which is applied to the transmission of uplink data and the uplink transmission of multi-user MIMO systems assisted by specifications, which can solve problems such as noise power enhancement and system transmission performance reduction.

Inactive Publication Date: 2014-09-17
XIDIAN UNIV
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Problems solved by technology

However, at the receiving end of the base station, due to the influence of the zero-forcing post-processing matrix, the noise power will be enhanced and the transmission performance of the system will be reduced

Method used

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  • Singular value decomposition-based method for uplink transmission of multi-user MIMO (Multiple-Input Multiple-Output) system
  • Singular value decomposition-based method for uplink transmission of multi-user MIMO (Multiple-Input Multiple-Output) system
  • Singular value decomposition-based method for uplink transmission of multi-user MIMO (Multiple-Input Multiple-Output) system

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[0054] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0055] refer to figure 2 , the system used in the present invention is a multi-user MIMO system, which consists of a base station and K users. Among them, the base station is equipped with M antennas, and the jth user is equipped with N j Antennas, 1≤j≤K. figure 2 x in j is the information data sent by the jth user to the base station, β j Adjust the matrix for the j-th power, Q j is the preprocessing matrix of the jth user, y is the signal of all users received by the base station, T is the postprocessing matrix, is the post-processed received signal, s is the The real and imaginary parts of each element of the information symbol vector x are transformed into a conversion vector of continuous integers, is the converted received signal, is the decision vector of the information symbol vector x, The latter is the estimat...

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Abstract

The invention discloses a singular value decomposition-based method for uplink transmission of a multi-user MIMO (Multiple-Input Multiple-Output) system. According to the method, the noise power reinforcement caused by zero forcing postprocessing in the prior art is mainly solved, and the realization process is as follows: expressing information symbols sent by a user to be a column vector to construct a power adjustment matrix; conducting singular value decomposition on a channel matrix to construct a preprocessing matrix; conducting power normalization and preprocessing on vectors of the information symbols; sending signals to a base station by the user, conducting lattice reduction conversion on a transmission matrix for receiving signals by the base station to obtain an approximate orthogonal matrix; constructing a postprocessing matrix by utilizing the approximate orthogonal matrix according to a zero forcing detection method so as to conduct postprocesing on the received signals; and converting a real part and an imaginary part of the information symbols of the postprocessed signals into continuous integers, conducting quantization integer operation on the signals to obtain judgment vectors of the information symbols, judging and then outputting the obtained estimated value. The singular value decomposition-based method has the advantages that the noise power reinforcement effect can be eliminated effectively.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to the transmission of uplink data in a multi-user MIMO system, in particular to an uplink transmission method of a multi-user MIMO system assisted by a lattice specification based on singular value decomposition. Background technique [0002] In order to meet the requirements of high transmission rate, high reliability and high system service capacity of future wireless communication, the terminals and base stations of the wireless transmission system will need to be equipped with multiple antennas to form a MIMO system with multiple inputs and multiple outputs. The MIMO system provides Gains such as multiplexing and diversity greatly improve the transmission rate and reliability of the system. At present, a large number of research results have been obtained in the single-user MIMO system, which can double the information rate transmitted by the user without increasing the ban...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06H04B7/08
CPCY02D30/70
Inventor 刘伟李建东李红艳李承彪盛敏黄鹏宇刘勤张文柱
Owner XIDIAN UNIV
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