Multi-user MIMO (multi-input multi-output) dispatching method and device

Abstract

The invention provides a multi-user MIMO (multi-input multi-output) dispatching method, comprising the following steps of: selecting a first user from users to be paired, and in the users to be paired except the first user, selecting a second user to be paired with the first user, wherein a frequency deviation value of the second user meets a preset condition with a frequency deviation value of the first user, at the beginning, the users to be paired comprise all the users, and the user to be paired comprise the other users except the paired user after at least one pairing is completed. The invention further provides a multi-user MIMO dispatching device. After the multi-user MIMO dispatching method disclosed by the invention is used, a set of the second user to be paired with the first user is confirmed according to the frequency deviation value of the first user to be paired, so that the computing complexity for pairing the users can be greatly reduced; and the frequency deviation values of the paired users are within a preset range, so that the frequency deviation compensation can be conveniently carried out on the paired users by a receiver.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a multi-user multi-input multi-output scheduling method and device. Background technique [0002] MIMO (Multiple-input Multiple-output) technology uses multiple antennas to transmit and multiple antennas to receive, to resist the influence of wireless fading channels, obtain space diversity gain, and greatly improve the system capacity of wireless communication systems and spectral efficiency are key technologies for next-generation mobile communications. Due to the general demand for smaller and lighter devices in future mobile communications, the number of antennas in terminals will be limited, which makes it difficult to fully utilize the advantages of MIMO technology in uplink transmission. Therefore, in order to solve this problem, multiple users using single-antenna transmission and multiple antennas of the base station can form multi-user MIMO (...

AI Technical Summary

Problems solved by technology

[0004] Since the base station needs to pair two users to form multi-user MIMO transmission according to a certain scheduling method, the scheduling method involved will have a greater impact on the system

Usually, two users with better channel orthogonality are paired so that it is easier to separate the two transmitted signals at the receiving end, but since the pairing is performed among all users in the cell, the computational complexity is very high ; At the same time, the difference in user frequency offset is not considered in the pairing process. After a large difference in frequency offset occurs between the paired users, the pilot frequency or data of the two users cannot be separated while compensating the frequency offset of the paired users. In addition to its unique inter-user interference (MultiAccess Inference, MAI), the multi-user MIMO system also has serious inter-carrier interference (Inter-Carrier Inference, ICI) of each user, which causes demodulation errors and makes the throughput drop in volume

Even if such user pairing constitutes multi-user MIMO, the complexity of receiver processing will increase dramatically, or the signaling overhead of the system will also increase significantly

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