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Multi-user MIMO system user selection method based on space angle

A system user and multi-user technology, applied in the field of multi-user MIMO system user selection based on space angle, can solve the problem that the system throughput needs to be improved, and achieve the effect of improving throughput, low complexity, and low algorithm complexity

Inactive Publication Date: 2015-03-25
SHANDONG UNIV
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Problems solved by technology

Now, the classic multi-user selection method still needs to improve the system throughput while ensuring the complexity of the algorithm

Method used

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  • Multi-user MIMO system user selection method based on space angle
  • Multi-user MIMO system user selection method based on space angle
  • Multi-user MIMO system user selection method based on space angle

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Embodiment Construction

[0029] The present invention is described in detail below in conjunction with accompanying drawing:

[0030] figure 1 describes a multi-user MIMO system where the total number of users is K t , the base station is equipped with M transmit antennas, user i is configured with N i root receiving antenna, i=1,2,…,K t , the channel is an additive white Gaussian noise channel.

[0031] Multi-user MIMO transmitter processing module M1: performs symbol mapping, radio frequency, intermediate frequency modulation and baseband processing on the bit stream generated by the source. The module can be divided into two units. The first unit is used to complete layer mapping, that is, to map the codebook to the layer. The second unit is used to complete multi-user precoding and complete power allocation by eliminating multi-user interference. process. It should be noted that the user scheduling scheme proposed by the present invention is also implemented in this module.

[0032] OFDM (Or...

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Abstract

The invention discloses a multi-user MIMO system user selection method based on a space angle. The method comprises the step of initialization, wherein in a multi-user MIMO system, an initialization alternative user set is T=(1, 2, ..., Kt), a dispatch set is expressed by a formula (please see the formula in the description), an F-norm of a channel matrix Hk of each user k is calculated, k is equal to 1, 2, ..., Kt, and Kt represents the total number of users in a cell; the first user is selected as u1=arg maxk<T8k, a set S=S+(u1) and a set T=T / (u1) are updated, and the system throughput C=water filling (S) at the moment is calculated; the step of loop iteration, wherein starting from the second user, disturbance minimizing greed selection is carried out by utilizing the mode of calculating an included angle between subspace W formed by the selected user set S and subspace V of the current user, selection circulates until the K users are selected, K represents the upper limit of containing the users of a system, the selected user set S is returned, and the throughput C of the MIMO system at the moment is calculated. The throughput of the system is greatly increased while low complexity of the method is ensured.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a user selection method of a multi-user MIMO system based on space angles. Background technique [0002] In recent years, the multi-user multiple-input multiple-output system (MU-MIMO, Multi-User Multiple-Input Multiple-Output) has been popularized. Compared with the single-user multiple-input multiple-output system (SU-MIMO, Single-User Multiple-Input Multiple-Output), which utilizes multi-user diversity and increases the spatial dimension, thereby greatly improving the throughput of the system, so that the system throughput is linearly related to min{M, KN}, where M and N are the emission The number of antennas at the end (base station) and at the receiving end (user equipment). [0003] In the MU-MIMO system, due to the existence of multiple users, interference from other users is also inevitable. Therefore, many measures (precoding schemes) to eliminate multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0452H04B7/0456
Inventor 曹叶文袁坤
Owner SHANDONG UNIV
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