采用VCSEL阵列的Tb/s室内MIMO光无线回传系统
A Tb/s Indoor MIMO Optical Wireless Backhaul System Using VCSEL Arrays
摘要：
本文系统地设计了一种基于垂直腔面发射激光器（VCSEL）阵列的多输入多输出（MIMO）光无线通信（OWC）链路，以支持数据率超过1 Tb/s的第六代（6 G）室内无线网络回程。提出的设计结合了直流光正交频分复用（DCO-OFDM）和空间复用MIMO架构。对于这种具有低发散激光束的超高速视线（LOS）OWC链路，保持对准是非常重要的。在本文中，发射机和接收机之间的两种类型的失调误差，即径向位移误差和定向角误差，并彻底建模在一个统一的分析框架假设高斯激光束，从而在广义失调模型（GMM）。推导出的GMM扩展到MIMO阵列和MIMO-OFDM OWC系统的性能进行了分析的聚合数据率。通过计算机模拟，研究了束腰、阵列配置和不同失调误差等因素对系统性能的影响，为短距离Tb/s MIMO OWC系统的设计提供了指导。
英文摘要：
In this paper, the design of a multiple-input multiple-output (MIMO) optical wireless communication (OWC) link based on vertical cavity surface emitting laser (VCSEL) arrays is systematically carried out with the aim to support data rates in excess of 1 Tb/s for the backhaul of sixth generation (6G) indoor wireless networks. The proposed design combines direct current optical orthogonal frequency division multiplexing (DCO-OFDM) and a spatial multiplexing MIMO architecture. For such an ultra-high-speed line-of-sight (LOS) OWC link with low divergence laser beams, maintaining alignment is of high importance. In this paper, two types of misalignment error between the transmitter and receiver are distinguished, namely, radial displacement error and orientation angle error, and they are thoroughly modeled in a unified analytical framework assuming Gaussian laser beams, resulting in a generalized misalignment model (GMM). The derived GMM is then extended to MIMO arrays and the performance of the MIMO-OFDM OWC system is analyzed in terms of the aggregate data rate. Novel insights are provided into the system performance based on computer simulations by studying various influential factors such as beam waist, array configuration and different misalignment errors, which can be used as guidelines for designing short range Tb/s MIMO OWC systems.
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