A multi-cell coordination large-scale MIMO beam domain multicast power distribution method

Abstract

The invention provides a large-scale MIMO beam domain multicast power distribution method based on multi-cell coordination. A base station configured with a large-scale antenna array carries out multicast communication with all users of a cell on the same time-frequency resource in an intra-cell multicast mode. A plurality of cells form a cell cluster, and each cell base station acquires beam domain statistical channel state information of all users in the cell cluster and sends the beam domain statistical channel state information to the central processing center. And the central processing center performs multicast signal power distribution on the base stations of the cells in the cell cluster according to the statistical channel state information. Wherein the beam domain power allocation is based on Minornize- Maximize Iteratively iterative algorithm and a deterministic equivalence method, and dynamically updating a power distribution result along with the change of statistical channel state information. According to the method and the device, the problem that the base station side only knows the power distribution problem of beam domain multi-cell multicast of statistical channel state information is solved, the multicast and the rate of the system are improved, and the implementation complexity is effectively reduced.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a power allocation method for multi-cell coordinated massive MIMO beam domain multicast by using a large-scale antenna array and statistical channel state information from a base station to each user in a multi-cell multicast scenario. Background technique [0002] The massive MIMO system base station uses a large-scale antenna array (the number of antennas is hundreds or even thousands) to serve multiple users at the same time, effectively reducing the interference between users, and improving the spectrum utilization and power efficiency of the wireless communication system. Beam domain transmission means that the base station side converts the transmitted signal to the beam domain through a unified unitary transformation, making full use of the spatial angular resolution of the large-scale antenna array and the local characteristics of the user channel in the beam domain. ...

AI Technical Summary

Problems solved by technology

In this scenario, it is often necessary to construct and solve the power allocation problem about the multicast signal sent by the base station. The objective function of this kind of problem is not concave, and it is usually difficult to obtain the global optimal solution. In addition, the optimization process needs to perform expected calculations, and the implementation complexity is high.

At the same time, the existing multi-cell multicast power allocation method only considers the channel conditions of users in the cell, and does not make full use of the channel conditions of users in other surrounding cells. There is still a lot of room for performance improvement in the optimization results

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