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Multi-user beamforming method and multi-user beamforming device for multi-input multi-output system

A beamforming and multi-output technology, applied in the field of MIMO systems, can solve the problems of large data volume, low efficiency, and unsatisfactory effects, and achieve the effect of removing signal interference and realizing simultaneous co-frequency multiplexing

Inactive Publication Date: 2010-06-09
ZTE CORP
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Problems solved by technology

When the BS (Base Station, base station) adopts the interference cancellation algorithm, it must first obtain the channel matrix of the user's downlink channel. When the MIMO system adopts the FDD (Frequency Division Duplex, frequency division duplex) method, the BS can only obtain the channel matrix based on the user's feedback. The channel matrix of the downlink channel, so during the operation of the algorithm, the amount of data is large, the efficiency is low, and the effect of removing signal interference between multiple users is not ideal

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Embodiment Construction

[0042] The multi-users in the present invention refer to two or more users, and the present invention will be further described below with reference to the accompanying drawings.

[0043] refer to figure 1 , a multi-user beamforming method for a MIMO system, comprising the following steps:

[0044] S101: the BS obtains the angle of arrival of each user in the MIMO system;

[0045] When the MIMO system adopts the TDD mode, when the BS obtains the angle of arrival of the user, it first uses the reciprocity of the upper and lower channels to determine the channel matrix of the user's downlink channel according to the channel matrix of the user's uplink channel; then, according to the channel matrix of the user's downlink channel. The matrix obtains the arrival angle of the user;

[0046] When the MIMO system adopts the FDD method, the BS can obtain the angle of arrival of the user in one of the following three methods:

[0047] method one:

[0048] The BS performs DOA estimat...

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Abstract

The invention discloses a multi-user beamforming method and a multi-user beamforming device for a multi-input multi-output (MIMO) system. The method comprises the following steps that: a, a BS acquires the DOA of each user in the MIMO system; b, the BS groups users, namely the users satisfy a predetermined grouping condition are grouped into the same user group; and c, the BS determines a beamforming transmission weight of each user according to the DOAs of the users in each user group, and the data stream of each user is transmitted by an antenna after being multiplied by the beamforming transmission weight thereof. The device is positioned on one side of the BS and comprises a DOA acquisition module, a user grouping module, a data stream processing module and the antenna. The technical scheme of the invention realizes the multi-user beamforming on the basis of null broadening in the MIMO system.

Description

technical field [0001] The present invention relates to a MIMO (Multiple Input and Multiple Output, multiple input multiple output) system, in particular to a multi-user beamforming method and device of the MIMO system. Background technique [0002] The MIMO system can effectively improve the channel capacity. Therefore, the MIMO technology has become a technology that attracts much attention in the research of LTE (Long Term Evolution, a long-term development and evolution plan of the 3G network organized by 3GPP). [0003] Beamforming technology distinguishes users based on their azimuths, removes signal interference between multiple users by controlling the direction of the beam and the specific shape of the beam pattern, and enables multiple users to reuse the same time and frequency resources. The beamforming technology is especially suitable for the open suburban scene, which can obtain obvious beam energy gain and expand the coverage of the cell. [0004] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04L1/06
Inventor 郭阳
Owner ZTE CORP
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