Highly Sensitive SPAD-Based Receiver for Dimming Control in LiFi Networks.
Highly Sensitive SPAD-Based Receiver for Dimming Control in LiFi Networks.
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基于高度敏感的SPAD接收器，用于LIFI网络中的调光控制。
DOI：
10.3390/s23104673
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发表时间：
2023-05-11
期刊：
影响因子：
--
通讯作者：
Safari M
中科院分区：
文献类型：
--
作者：
Hijazi M;Huang S;Safari M
可见光通信（VLC）是一种新兴的无线通信模式，既支持照明，又支持通信。VLC系统的一个基本功能是调光控制，这需要一个敏感的接收器用于低光条件。单光子雪崩二极管阵列的使用是一种很有前途的方法，以提高接收器的灵敏度在VLC系统。然而，由于SPAD死区时间带来的非线性效应，光的亮度的增加可能会降低其性能。本文提出了一种自适应SPAD接收器，用于VLC系统，以确保在各种调光水平下的可靠操作。在该接收机中，可变光衰减器（VOA）用于根据瞬时接收光功率自适应地控制SPAD的入射光子速率，使SPAD工作在其最佳条件下。所提出的接收机在系统中的各种调制方案的应用进行了研究。当采用二进制开关键控（OOK）调制，由于其良好的功率效率，基于模拟和数字调光的IEEE 802.15.7标准的两种调光控制方法被认为是。我们还研究了所提出的接收机在具有多载波调制方案的频谱高效VLC系统中的应用，即，直流（DCO）和非对称限幅光（ACO）正交频分复用（OFDM）。通过大量的数值计算结果表明，建议的自适应接收机优于传统的PIN PD和SPAD阵列接收机的误码率（BER）和可达到的数据速率。
Visible light communication (VLC) is an emerging mode of wireless communication that supports both illumination and communication. One essential function of VLC systems is the dimming control, which requires a sensitive receiver for low-light conditions. The use of an array of single-photon avalanche diodes (SPADs) is one promising approach to enhancing receivers’ sensitivity in a VLC system. However, because of the non-linear effects brought on by the SPAD dead time, an increase in the brightness of the light might degrade its performance. In this paper, an adaptive SPAD receiver is proposed for VLC systems to ensure reliable operation under various dimming levels. In the proposed receiver, a variable optical attenuator (VOA) is used to adaptively control the SPAD’s incident photon rate according to the instantaneous received optical power so that SPAD operates in its optimal conditions. The application of the proposed receiver in systems with various modulation schemes is investigated. When binary on–off keying (OOK) modulation is employed due to its good power efficiency, two dimming control methods of the IEEE 802.15.7 standard based on analogue and digital dimming are considered. We also investigate the application of the proposed receiver in the spectral efficient VLC systems with multi-carrier modulation schemes, i.e., direct current (DCO) and asymmetrically clipped optical (ACO) orthogonal frequency division multiplexing (OFDM). Through extensive numerical results, it is demonstrated that the suggested adaptive receiver outperforms the conventional PIN PD and SPAD array receivers in terms of bit error rate (BER) and achievable data rate.
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