تعيين ضرايب بهينه‌ي دودويي براي شكل‌دهي پرتوي دو و سه‌جهته در سطوح هوشمند بازتابي

Optimal Binary Coefficient Design for Two- an‎d Three-Beamforming in Intelligent Reflecting Surfaces

مهندسي برق

In recent years, antenna arrays an‎d intelligent reflecting surfaces (IRS) have attracted attention as novel tools to improve the performance of communication systems. This thesis, focusing on the modeling an‎d analysis of systems consisting of multi-user antenna arrays an‎d intelligent reflecting surfaces, addresses the problem of designing IRS reflection coefficients an‎d beamforming weights under different conditions. At first, by studying the structure of multiple arrays an‎d their interaction with reflecting surfaces, the framework of the beamforming problem is mathematically defined. Then, the Optimal Partitioning Algorithm (OPA) is introduced as an efficient method for solving the beamforming optimization problem, an‎d its implementation for single-direction scenarios is presented. Next, various generalizations of this algorithm for multi-directional cases are investigated, an‎d their performance is analyzed in more complex scenarios. A method that efficiently finds the optimal solution in the multi-directional problem is also introduced. In this regard, by examining the mathematical structure of the problem an‎d analyzing the existing limitations, as referred to in the OPA, this thesis proposes a new approach to improve the performance of OPA in multi-directional scenarios. The implementation results indicate improvements in power efficiency an‎d beamforming quality compared to existing methods.

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