Large-scale MIMO wave beam domain safety multicast wireless transmission method

Abstract

The invention proposes a large-scale MIMO wave beam domain safety multicast wireless transmission method. A wireless communication base station side is provided with a large-scale antenna array, and generates a large-scale beam set covering the whole cell through an analog multi-beam forming method or digital multi-beam forming or analog and digital mixed beam forming method. The base station performs the power allocation of a transmitted signal in a wave beam domain according to the wave beam domain statistical channel state information of a legal user and an eavesdropping user. A wave beam domain power allocation algorithm comprises an iterative algorithm based on certainty equalization and CCCP, and a convex optimization problem is solved through iteration to obtain a wave beam domain power allocation matrix. A wave beam domain power allocation result is dynamically updated with the change of the statistical channel state information in the multicast process. The method provided bythe invention solves the problems of complexity and safety of multicast transmission of a large-scale MIMO wireless communication system.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to a beam domain secure wireless transmission method using a large-scale antenna array in a multicast communication scenario. Background technique [0002] In the case of limited spectrum resources, adopting a massive multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) technology can greatly improve the spectrum efficiency and power efficiency of a wireless communication system, and adapt to the ever-increasing demand for wireless services. In the multicast communication scenario, the base station transmits the same information to the target user group at the same time. At the same time, due to the openness of wireless networks, the phenomenon of illegal users eavesdropping on information is becoming more and more serious. How to ensure the security of information transmission has become one of the urgent problems to be solved in the wireless communication...

AI Technical Summary

Problems solved by technology

Most traditional methods use instantaneous channel information to implement multicast transmission, and instantaneous channel information is difficult to obtain in practical systems

In addition, the secure multicast rate in secure multicast transmission is a non-convex function, and it is usually difficult to obtain a global optimal solution for multicast precoding design

And when the number of antennas on the base station side is large, the implementation complexity of using the traditional interior point method is relatively high

Images