In this paper, we propose a technique to solve the physical interference phenomenon occurring in the hybrid VLC-P2P network system Visible light communication (VLC) utilizing indoor lighting infrastructure is advantageous for establishing a wireless peer-to-peer (P2P) network environment. However, unlike RF wireless network environments, adjacent lighting and the optical wavelengths of multiple light sources cause interference among one another, greatly degrading the performance of the network system. In an actual indoor environment in which a plurality of lights exist, the received signal power differs for each LED according to the position of the receiver, and the LEDs interfere with each other. In addition, since each LED light source has a narrow field of view (FOV), the receiver located at the cell boundary receives increased interference. Since the visible light communication system uses the IM-DD system, the system performance is significantly degraded from such interference. To solve this problem, we propose selective switching dual –transmission (SSDT) for a multi-LED-VLC system. The proposed scheme can divide the received power range into three areas of the cell where the receiver is located. These include: area 1, where the target receiving signal power range is largest; area 2, where the range of interference signal power of adjacent LED is large; and area 3, where the received power occurs at cell boundary. Therefore, the receiver detects a signal having a different received power according to the receiver position in the current cell. If the target signal has the largest received power, it is used as it is. If interference signals from adjacent LEDs are detected, the interference cancellation technique using the difference in received power is used to eliminate the interference. If the receiver is located at the boundary of the cell, it becomes difficult to distinguish the interference signal component of each LED, so each LED is switched to cooperative communication. Through this scheme, the performance of the whole VLC-P2P network system can be improved by selective transmission according to the position of the receiver.

中文翻译：

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多LED混合VLC-P2P组网系统中的选择性切换双传输方案

在本文中，我们提出了一种解决在混合VLC-P2P网络系统中发生的物理干扰现象的技术。利用室内照明基础设施的可见光通信（VLC）有利于建立无线对等（P2P）网络环境。但是，与RF无线网络环境不同，相邻的照明和多个光源的光波长彼此之间会造成干扰，从而大大降低了网络系统的性能。在存在多个光的实际室内环境中，根据接收器的位置，每个LED的接收信号功率不同，并且LED彼此干扰。另外，由于每个LED光源都具有狭窄的视场（FOV），因此位于单元边界的接收器会收到增加的干扰。由于可见光通信系统使用IM-DD系统，因此这种干扰会大大降低系统性能。为了解决这个问题，我们提出了用于多LED-VLC系统的选择性切换双传输（SSDT）。所提出的方案可以将接收的功率范围划分为接收器所位于的小区的三个区域。这些区域包括：目标接收信号功率范围最大的区域1；区域2，相邻LED的干扰信号功率范围较大；区域3，接收功率发生在小区边界。因此，接收器根据当前小区中的接收器位置来检测具有不同接收功率的信号。如果目标信号具有最大接收功率，则按原样使用它。如果检测到来自相邻LED的干扰信号，使用接收功率差的干扰消除技术可消除干扰。如果接收器位于小区的边界，则很难区分每个LED的干扰信号分量，因此每个LED都切换为协作通信。通过这种方案，可以根据接收者的位置进行选择性传输，从而提高整个VLC-P2P网络系统的性能。