Large-scale MIMO wave beam domain joint unicast and multicast transmission method

Abstract

The present invention provides a large-scale MIMO wave beam domain joint unicast and multicast transmission method. According to the method, a base station of wireless communication is provided with alarge-scale antenna array, and a large-scale wave beam set for covering the whole cell is generated through beam forming. A mode of wave beam joint unicast and multicast mode is employed by the basestation on the same time-frequency resource to perform communication with users in a cell. The base station performs power distribution for the multicast signals of the wave beam region and the unicast signals sent to each user according to the wave beam region statistics channel state information of each user in the cell, wherein the wave beam region power distribution is based on the MM iterative algorithm and determinacy identification method, a wave beam region power distribution matrix is obtained through solution of a convex optimization problem through iteration, and is dynamically updated with the change of the statistics channel state information. The power distribution optimization problem of the wave beam region joint unicast and multicast transmission of the statistics channelstate information at the base station is solved, the unicast and multicast transmission rate is improved, and the achievement complexity is effectively reduced.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a beam domain wireless transmission method for performing joint unicast and multicast under the same time-frequency resource by using a large-scale antenna array. Background technique [0002] In the massive MIMO system, the base station arranges a large-scale antenna array to serve multiple users simultaneously. The use of massive MIMO technology can effectively reduce the interference between users and greatly improve 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, and performs signal transmission in the beam domain channel, making full use of the spatial angle resolution of the large-scale antenna array and the locality of the user channel in the beam domain . [0003] In the joint unic...

AI Technical Summary

Problems solved by technology

In this scenario, it is often necessary to construct and solve the power allocation problem of the transmitted signal, so that the weighted average of the unicast rate and multicast rate of the entire system can be maximized, and the optimization objective function of this type of problem is often non-convex, and it is usually difficult to obtain global optimal solution

At the same time, calculating the unicast and multicast rate in the optimization process requires calculations to find expectations, and the implementation complexity is very high

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