Beam arrival angle-based multiuser scheduling scheme

A multi-user scheduling and angle-of-arrival technology, applied in the field of multi-user MIMO user scheduling algorithm, can solve the problems of consuming feedback links, reducing system spectrum utilization, increasing user scheduling performance dependence, etc., to improve channel capacity and reduce The amount of feedback information and the amount of scheduling operations, the effect of reducing complexity

Active Publication Date: 2014-04-02
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This not only increases the dependence of user scheduling performance on instantaneous channel state information, but also consumes a large number of feedback links in the system and reduces the spectrum utilization of the system.

Method used

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  • Beam arrival angle-based multiuser scheduling scheme
  • Beam arrival angle-based multiuser scheduling scheme
  • Beam arrival angle-based multiuser scheduling scheme

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Embodiment

[0026]Embodiment: In a multi-user scheduling method based on beam arrival angles, before data transmission, first judge the current moment for user scheduling. If not, transmit data normally, if yes, perform user scheduling first. Suppose the total number of users in the system is K, and the number of scheduled users is M. The specific user scheduling algorithm is as follows: firstly, according to the arrangement form of the base station antenna array, estimate the angle spectrum of the direction of arrival of the K channels, find the peak value of the spectrum line, and the corresponding angle is regarded as the beam angle of arrival of the signal; then the user Divide into M sets according to the arrival angle isolation; finally select the user with the largest channel Frobenius norm from each set, and combine them to form space division multiplexing.

[0027] The specific steps are as follows:

[0028] (1) System initialization, randomly select M users to form virtual MIM...

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Abstract

The invention discloses a beam arrival angle-based multiuser scheduling scheme, which mainly comprises the following three steps of: 1) estimating the beam arrival angle; 2) dividing user subsets based on the beam arrival angle; and 3) selecting the optimal user in each subset. If a total user number is K, and a scheduling user number is M, an algorithm reduces the complexity to 2 K, ensures small loss of the performance, and is a low-computation suboptimal algorithm. Compared with the conventional user scheduling algorithm, the beam arrival angle-based multiuser scheduling scheme performs user scheduling according to long-term statistical information of a channel, has low computation complexity, low dependence on the instantaneous channel state information of a user, and higher robustness aiming at the time variability of a wireless channel, and can remarkably reduce the feedback information amount required by a system. Besides, a user channel scheduled by the scheme of the invention statistically has excellent orthogonality, and effectively improves the accessible channel capacity of the system.

Description

technical field [0001] The invention belongs to the field of multi-user MIMO user scheduling algorithm, in particular to a multi-user scheduling algorithm in a multi-antenna system. Background technique [0002] In a mobile communication system, the multi-user MIMO multiplexing transmission method is a key technology to make full use of the spatial freedom and improve the system capacity. Theory and practice have proved that different users of the system can be paired to form space division multiplexing, and the advantages of multiple antennas on the base station side can be used to transmit data for multiple users at the same time. [0003] In the downlink system of multi-user MIMO, there are two main aspects of research. [0004] The first is multi-user precoding. The function of multi-user precoding is to increase the signal-to-noise ratio of the receiving end as much as possible, so as to ensure that the original information of different users can be restored at the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/04H04L25/02
Inventor 赵春明洪赟许威
Owner SOUTHEAST UNIV
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