IRS辅助谐振波束通信系统的信道特性表征
Channel Characterization of IRS-assisted Resonant Beam Communication Systems
AI总结：
针对谐振波束通信（RBC）空中传输易受阻挡损耗影响的问题，提出采用光倍频方法的智能反射面（IRS）辅助RBC系统，建立近场菲涅耳衍射信道模型，通过动态分束比最大化通信功率，可补偿直视信道受阻和接收机失准损耗，实现最优通信性能。
摘要：
为满足日益增长的数据流量需求，频谱资源丰富的光无线通信（OWC）已成为6G发展的关键技术驱动力。谐振波束通信（RBC）系统采用空间分离的激光腔作为发射机和接收机，是一种无需跟踪即可实现自对准的高速OWC技术，但其在空气中传输时易受障碍物造成的损耗影响。本文提出了一种采用光倍频方法的智能反射面（IRS，intelligent reflecting surface）辅助RBC系统，其中基频与倍频的谐振波束分别通过直视（LoS，line-of-sight）直达信道和IRS辅助信道传输，以维持稳态振荡并实现无回波干扰的通信。随后，我们基于近场光传播下的菲涅耳衍射理论建立了信道模型，以解析分析传输损耗和倍频功率。此外，可根据空中遇到的损耗水平动态控制两个信道之间的分束比，从而最大化通信功率。数值结果验证了IRS辅助信道能够补偿受阻的LoS信道及接收机失准带来的损耗，通过动态比例调整可确保通信性能达到最优值。
英文摘要：
To meet the growing demand for data traffic, spectrum-rich optical wireless communication (OWC) has emerged as a key technological driver for the development of 6G. The resonant beam communication (RBC) system, which employs spatially separated laser cavities as the transmitter and receiver, is a high-speed OWC technology capable of self-alignment without tracking. However, its transmission through the air is susceptible to losses caused by obstructions. In this paper, we propose an intelligent reflecting surface (IRS) assisted RBC system with the optical frequency doubling method, where the resonant beam in frequency-fundamental and frequency-doubled is transmitted through both direct line-of-sight (LoS) and IRS-assisted channels to maintain steady-state oscillation and enable communication without echo-interference, respectively. Then, we establish the channel model based on Fresnel diffraction theory under the near-field optical propagation to analyze the transmission loss and frequency-doubled power analytically. Furthermore, communication power can be maximized by dynamically controlling the beam-splitting ratio between the two channels according to the loss levels encountered over air. Numerical results validate that the IRS-assisted channel can compensate for the losses in the obstructed LoS channel and misaligned receivers, ensuring that communication performance reaches an optimal value with dynamic ratio adjustments.
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