Propagation Modeling of Backscatter Communication Channels Assisted by Intelligent Reflecting Surface
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摘要: 为了解决引入智能反射面(IRS)后反向散射通信(BackCom)信道的传播模拟问题，该文提出一种基于抛物方程(PE)和矩量法(MoM)的高效混合数值方法。该方法将电大场景下IRS辅助信道的传播建模问题分解为电波传播与电磁散射两个子问题，分别采用PE和MoM进行求解。通过对视距和非视距场景下IRS辅助的信道进行模拟，探讨了PE-MoM混合求解技术的高效性。仿真结果表明，与MoM相比，所提算法的计算速度提升了6.46倍，计算资源消耗也下降了81%，且相对均方根误差仅为3.89%。对比结果表明所提出的PE-MoM方法能够在兼顾计算精度和计算效率的同时，实现IRS辅助的BackCom信道的传播模拟。Abstract: To model the radio wave propagation within channels of Backscatter Communication (BackCom) systems with Intelligent Reflecting Surface (IRS) included, an efficient hybrid method based on the Parabolic Equation (PE) method and Method of Moment (MoM) is proposed in this paper. The propagation modeling of IRS-assisted channels in electrically-large scenarios is considered in this method through aspects of radio wave propagation and electromagnetic scattering. The two aspects are then numerically solved by the PE method and MoM, respectively. Through simulations of IRS-assisted channels in line-of-sight as well as non-line-of-sight scenario, the efficiency of the PE-MoM hybrid method is demonstrated. Simulation results show that the computational speed of the proposed algorithm is 6.46 times faster than that of MoM. Meanwhile, the computational resource consumption is also reduced by 81% with the relative root mean square error maintained as 3.89%. The comparison of results shows that the proposed PE-MoM hybrid method can realize the propagation simulation of the IRS-assisted BackCom channels with a better tradeoff between the computational accuracy and computational efficiency achieved.
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