研究目的
To optimize the spectral efficiency for the IRS-aided MIMO system by designing the phase-shifts matrix and the precoder one after another.
研究成果
The proposed CE-based algorithm for designing the IRS phase-shifts matrix and the subsequent precoder design using SVD and WF solutions significantly enhance the spectral efficiency of the THz MIMO communication system. Numerical results validate the performance of the proposed designs.
研究不足
The study assumes discrete phase-shifts for the IRS and perfect reflecting mode, which may not account for all practical implementation challenges. The complexity of the exhaustive search method for optimal phase-shifts is high, though mitigated by the proposed CE-based algorithm.
1：Experimental Design and Method Selection:
The study involves designing discrete phase-shifts at the IRS and the precoder at the BS to optimize spectral efficiency. A cross-entropy based algorithm is proposed to search the optimal IRS phase-shifts matrix, followed by the use of singular value decomposition and water-filling solution to design the optimal precoder.
2：Sample Selection and Data Sources:
The channels Ht, Hr, and Hd are constructed using a geometrical channel model to capture the peculiarities of the THz channel, where the channel is comprised of several paths.
3：List of Experimental Equipment and Materials:
The system includes a BS with Nt antennas, an IRS equipped with N passive reflecting elements, and a user with K antennas.
4：Experimental Procedures and Operational Workflow:
The IRS phase-shifts matrix is designed first using a CE-based algorithm, followed by the precoder design using SVD and WF solutions.
5：Data Analysis Methods:
The spectral efficiency is calculated and compared for different schemes to evaluate the performance of the proposed designs.
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