Design method of precoding matrix for single group multicast single stream system based on admm

Abstract

The present invention provides a method for designing a precoding matrix based on an ADMM single-group multicast single-stream system. The implementation steps are: setting parameters of the single-group multicast single-stream system; constructing a mathematical model of the single-group multicast single-stream system; Reconstruct the mathematical model of single-group multicast single-stream system; define the augmented Lagrangian function based on the reconstruction model; solve the augmented Lagrangian function by using the alternating direction multiplier method ADMM; Streaming system precoding matrix. The present invention converts the problem solving of the mathematical model of the single-group multicast single-stream system with the minimum transmission power as the objective function into a convex optimization problem, processes the transmitted signal based on the precoding matrix obtained by ADMM, and reduces the transmission signal to a large extent. The transmission power of the signal can effectively improve the spectrum efficiency and energy efficiency of the physical layer multicast system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for designing a precoding matrix for a single-group multicast single-stream system, in particular to a method for designing a precoding matrix for a single-group multicast single-stream system based on ADMM, which can be used for mobile TV , hotspot push and other scenarios for content distribution. Background technique [0002] With the continuous development of modern wireless communication technology and wireless services, the number of users and service demands in the field of wireless communication technology are increasing rapidly. However, available spectrum resources in wireless communication technologies are very limited. The increasingly prominent contradiction between user service requirements and spectrum resources has prompted people to research and develop transmission technologies with high spectrum utilization. In this context, the wireless...

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Problems solved by technology

[0005] For example, in 2014, L.Tran, M.F.Hanif and M.Juntti published a journal titled A Conic Quadratic Programming Approach to Physical Layer Multicasting for Large-Scale Antenna Arrays on page 114 of the 21st volume of IEEE Signal Processing Letters, open A method for designing the precoding matrix of a single-group multicast single-stream system is proposed. The method defines the precoding matrix of the system in the complex number domain, takes the minimum transmission power of the transmitted signal as the objective function, and takes the signal-to-noise ratio of the user to receive The mathematical model of a single-group multicast single-stream system is constructed as a constraint condition that is less than the minimum signal-to-noise ratio threshold. Based on the solution of SDR, the solution of the mathematical model is converted into a provable The convergent iterative second-order cone programming (SOCP) problem is solved to obtain the precoding matrix when the objective function converges. This method greatly reduces the computational complexity and improves the spectral efficiency and Energy efficiency, but the improvement of the transmission power of the system by the precoding matrix designed by this method still cannot meet the spectral efficiency requirements of the future wireless communication system that provides large-capacity and diverse data services for a large number of devices

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