Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation
Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation
复制标题
用于可见光通信的基于调光的调制方案：光谱分析和 ISI 缓解
DOI：
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发表时间：
2021
影响因子：
7.9
通讯作者：
A. Dixit
中科院分区：
文献类型：
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作者：
Rishu Raj;S. Jaiswal;A. Dixit
可见光通信（VLC）被设想为一种使能技术，以提供急需的光谱缓解，以满足对互联网连接和数据消费的不断增长的需求。由于VLC使用照明源进行照明和通信，因此需要提供调光控制以实现适当的照明和增强的错误性能以实现可靠的数据通信。在本文中，我们从整体上解决这两个问题。我们制定和研究的调光调制方案，即可变开关键控（VOOK）和可变脉冲位置调制（VPPM）的功率谱密度，因此，得出他们的带宽要求和频谱效率。此外，VLC系统的容量受到由于VLC中光信号的多径传播而发生的符号间干扰（ISI）的严重限制。我们提出了改善VLC系统的错误性能，通过使用信道均衡ISI缓解，从而提高系统容量。我们开发了一个可调光VLC系统，采用信道均衡的分析模型，并使用此模型来研究调光和数据速率的VOOK和VPPM方案的错误性能的影响。我们目前的仿真和分析结果表明，基于调光的调制方案的性能显着提高使用信道均衡。
Visible light communication (VLC) is being envisioned as an enabling technology to provide the much-needed spectral relief for the ever-increasing demand for Internet connectivity and data consumption. Since VLC uses illumination sources for lighting as well as communication, it is required to provide dimming control for proper lighting and enhanced error performance for reliable data communication. In this paper, we address both these issues holistically. We formulate and study the power spectral densities of dimming-based modulation schemes, namely variable on-off keying (VOOK) and variable pulse position modulation (VPPM), and hence, derive their bandwidth requirements and spectral efficiencies. Moreover, the capacity of VLC systems is severely limited by the inter-symbol interference (ISI) occurring as a result of the multipath propagation of light signals in VLC. We propose to ameliorate the error performance of VLC systems by using channel equalization for ISI mitigation, thereby enhancing the system capacity. We develop the analytical model of a dimmable VLC system employing channel equalization and use this model to study the effect of dimming and data rate on the error performance of VOOK and VPPM schemes. We present simulation and analytical results to show that the performance of dimming-based modulation schemes is significantly improved using channel equalization.