A General Physics-Based IRS Auxiliary Channel Model for Wireless Communications
A General Physics-Based IRS Auxiliary Channel Model for Wireless Communications
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DOI：
10.1109/lwc.2023.3344225
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发表时间：
2024-03
影响因子：
6.3
通讯作者：
Changge Huang;Zhuxian Lian;Bibo Zhang;Yajun Wang;Biao Wang
中科院分区：
文献类型：
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作者：
Changge Huang;Zhuxian Lian;Bibo Zhang;Yajun Wang;Biao Wang
提出了一种基于物理的智能反射面辅助信道模型，该模型考虑了智能反射面单元的投影结构。基于所提出的模型，我们研究了IRS放置对绩效的影响。利用卡尔达诺公式，最佳IRS的位置，这取决于发射机（Tx）和接收机（Rx）之间的距离和Tx和IRS的高度，推导出。观察到一个有趣的结果：IRS的高度和Tx的高度之间的比例关系的最佳IRS的位置的影响。当IRS的高度小于Tx的高度的一半时，最佳IRS位置位于Rx附近，反之亦然。此外，当IRS的高度是Tx的高度的一半时，存在两个最佳IRS位置，一个位于Tx附近，另一个位于Rx附近。使用导出的IRS位置，导出的最佳接收信号功率的封闭形式的表达式。仿真结果表明，在IRS辅助通信系统中应考虑IRS PS，否则会导致性能增益的高估。此外，仿真结果表明，IRS可以对抗毫米波通信中经历的大路径损耗。
A general physics-based intelligent reflecting surface (IRS) auxiliary channel model considering the projected structure (PS) of the IRS unit is proposed in this letter. Based on the proposed model, we investigate the effect of IRS placement on the performance. Using the Cardano formula, the optimum IRS placement, which depends on the distance between the transmitter (Tx) and the receiver (Rx) and the heights of the Tx and the IRS, is derived. An interesting result is observed: the optimal IRS position is affected by the proportional relationship between the height of the IRS and that of the Tx. When the height of the IRS is less than half of that of the Tx, the optimal IRS position is located near the Rx, and vice versa. Also, when the height of the IRS is half of that of the Tx, there are two optimal IRS positions, one located near the Tx and the other located near the Rx. Using the derived IRS positions, the closed-form expression of the optimum received signal power is derived. The simulation results show that the IRS PS should be considered in IRS-assisted communication systems, otherwise it will lead to the overestimation of the performance gains. In addition, the simulation results show that the IRS can combat the large path loss experienced in millimeter wave communications.