Measurements-Based Channel Models for Indoor LiFi Systems
Measurements-Based Channel Models for Indoor LiFi Systems
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DOI：
10.1109/twc.2020.3028456
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发表时间：
2021-02-01
影响因子：
10.4
通讯作者：
Haas, Harald
中科院分区：
文献类型：
--
作者：
Arfaoui, Mohamed Amine;Soltani, Mohammad Dehghani;Haas, Harald
光保真(LiFi)是一种全网络双向光无线通信(OWC)技术，被认为是一种很有前途的室内高速连接解决方案。与传统的射频无线系统不同，OWC信道不是各向同性的，这意味着设备方向对信道增益有很大影响。然而，由于LiFi系统缺乏合适的信道模型，许多研究假设接收器垂直向上且随机位于覆盖区域内，从实际角度来看，这并不是一个现实的假设。本文针对室内LiFi系统提出了一种新的基于测量的逼真信道模型。准确地说，对于随机定向的固定和移动用户的情况，推导了信道增益的统计量。对于平稳用户，提出了两种信道模型，即修正的截断拉普拉斯(MTL)模型和修正的Beta(MB)模型。针对移动用户，提出了两种信道模型，即修正截断高斯和(SMTG)模型和修正Beta(SMB)模型。基于所建立的模型，研究了用户的随机方位和空间分布对系统性能的影响，结果表明上述因素对信道增益和系统性能有很大的影响。
Light-fidelity (LiFi) is a fully-networked bidirectional optical wireless communication (OWC) technology that is considered as a promising solution for high-speed indoor connectivity. Unlike in conventional radio frequency wireless systems, the OWC channel is not isotropic, meaning that the device orientation affects the channel gain significantly. However, due to the lack of proper channel models for LiFi systems, many studies have assumed that the receiver is vertically upward and randomly located within the coverage area, which is not a realistic assumption from a practical point of view. In this paper, novel realistic and measurement-based channel models for indoor LiFi systems are proposed. Precisely, the statistics of the channel gain are derived for the case of randomly oriented stationary and mobile users. For stationary users, two channel models are proposed, namely, the modified truncated Laplace (MTL) model and the modified Beta (MB) model. For mobile users, two channel models are proposed, namely, the sum of modified truncated Gaussian (SMTG) model and the sum of modified Beta (SMB) model. Based on the derived models, the impact of random orientation and spatial distribution of users is investigated, where we show that the aforementioned factors can strongly affect the channel gain and the system performance.