Method and device for selecting downlink beam-forming base stations of distributed multiple-input multiple-output (MIMO) system

Abstract

The invention provides a method and a device for selecting downlink beam-forming base stations of a distributed multiple-input multiple-output (MIMO) system. The method comprises the following steps of: estimating channel matrixes from the base stations to mobile users, and calculating channel gains from the base stations to the mobile users; according to a threshold judgment rule, selecting the base stations for participating in communication, and selecting an adaptive modulation mode for the base stations which are selected for participating in the communication; and according to an irrigation principle, allocating proper power factors to the selected base stations. By selecting distributed base stations, the base stations which are near to the mobile users and have good channel quality can be selected for participating in the communication, so the distributed MIMO system is more intensive and convenient to control, and the corresponding signaling cost of the system is reduced.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a base station selection method and device for downlink beamforming in a distributed MIMO system. Background technique [0002] As the number of mobile communication users continues to increase, the traditional communication between one base station and multiple users in a cell makes the system capacity problem more and more prominent, and the distributed antenna (DA, distributed antenna) system with its large coverage , fewer handoffs, etc. are considered to be very competitive alternatives. In the prior art, the concept of distributed MIMO (Multiple Input Multiple Output) is proposed, that is, antennas of multiple base stations constitute a distributed multi-antenna system, and multiple antennas of users constitute a distributed MIMO system. The capacity of the distributed MIMO system under different fading channel conditions is discussed in the prior art. In...

AI Technical Summary

Problems solved by technology

For the case of ordinary single base station with multiple antennas, there have been literature discussions, but for multi-base stations with multiple antennas, how to select as few base stations as possible to participate in communication under the premise of meeting the communication requirements has not been considered as a whole.

[0003] In the prior art, in the process of communicating with a mobile user, the base stations near the mobile user will participate in the communication with the mobile user under the action of the central control unit, but every communication with the mobile user does not completely require all The base stations are all involved in the communication with a specific user, and the participation of some base stations is enough to complete the communication with the user. At this time, if all the base stations are required to participate, it will inevitably cause greater implementation complexity and more system overhead.

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