A phase shift optimization method for irs assisted downlink multi-user communication system
A technology for multi-user communication and auxiliary communication, which is applied in the field of phase shift optimization of intelligent reflective surface-assisted downlink multi-user communication systems, and can solve problems such as errors and high complexity of algorithm implementation
Active Publication Date: 2022-05-17
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology
Most of the existing IRS auxiliary communication system phase shift optimization algorithms use semi-definite relaxation technology (Semi-Definite Relaxation, SDR). Although this algorithm can maximize the system throughput, it not only has high algorithm implementation complexity but also obtains only an approximate solution, there may be unavoidable errors in the actual implementation
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[0051]The technical scheme in the embodiment of the invention will be clearly and completely described below in combination with the attached drawings in the embodiment of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in the art without making creative work belong to the protection scope of the invention.
[0052] The invention provides a phase shift optimization method of IRS assisted downlink multi-user communication system, such as Figure 1 and Figure 2 , including the following steps:
[0053] Based on the relationship between the mean square error matrix of the optimal decoding matrix and the channel capacity, the channel capacity optimization model of the IRS auxiliary communication system is constructed with the goal of maximizing the channel capacity;
[0054] The optimal decoding matrix, auxi...
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The invention belongs to the technical field of mobile communication, and specifically relates to a phase shift optimization method of an IRS-assisted downlink multi-user communication system, which includes establishing a mobile user's IRS-assisted communication system model, and based on the mean square error matrix of the optimal decoding matrix and the channel capacity The relationship between them, with the goal of maximizing the channel capacity, constructs the channel capacity optimization model of the IRS auxiliary communication system; solves the optimal decoding matrix, auxiliary matrix and precoding matrix in the channel capacity optimization model, according to the channel capacity optimization model and its known The matrix constructs the IRS phase shift optimization model; adopts the Riemann trust region method to solve the IRS phase shift optimization model, obtains the best phase shift, and uses it as the main diagonal element of the IRS phase shift matrix; the present invention has no loss in throughput In the case of , the complexity is greatly reduced, and the channel capacity obtained by the present invention is greater than that obtained by the traditional method under the same situation.
Description
technical field [0001] The invention belongs to the technical field of mobile communication, in particular to a phase shift optimization method for enabling intelligent reflecting surfaces (IRS) to assist downlink multi-user communication system. Background technology [0002] With the commercialization of the fifth generation (5g) wireless communication network, it means that the future infinite network has higher spectral efficiency, faster transmission rate and larger system capacity. Theoretically, its spectral efficiency can be 5 to 15 times higher than 4G, and its peak transmission speed can reach 10Gbit / s. 5g key technologies such as large-scale antenna array (m-mimo) and millimeter wave communication have made effective contributions to the realization of this function. However, the additional high hardware cost, huge power consumption or energy consumption and the location of 5g base stations are the main obstacles to their implementation in practice. Therefore, in ord...
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IPC IPC(8): H04B7/0456H04B17/391H04W24/02H04W24/06
CPCH04B7/0456H04B17/391H04W24/02H04W24/06Y02D30/70
Inventor 王丹刘金枝梁家敏陈发堂王华华杨黎明
Owner CHONGQING UNIV OF POSTS & TELECOMM