SPAD-Based Optical Wireless Communication With Signal Pre-Distortion and Noise Normalization
SPAD-Based Optical Wireless Communication With Signal Pre-Distortion and Noise Normalization
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DOI：
10.1109/tcomm.2022.3151888
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发表时间：
2022-04-01
影响因子：
8.3
通讯作者：
Safari, Majid
中科院分区：
文献类型：
--
作者：
Huang, Shenjie;Safari, Majid
近年来，人们对单光子雪崩二极管（SPAD）在光无线通信中的应用越来越感兴趣。作为光子计数探测器，SPAD可以提供比其他常用的光电探测器更高的灵敏度。然而，基于spad的接收机存在严重的死时非线性失真和信号相关噪声。在这项工作中，我们提出了一种新的基于spad的OWC系统，该系统可以通过在发射机处对信号进行预失真来成功消除死区时间引起的非线性失真。此外，提出了另一种具有预失真和噪声归一化功能的系统。由于额外的噪声归一化处理，对于接收端的变换信号，原来依赖于信号的噪声变得与信号无关，因此可以使用为AWGN信道设计的传统信号检测技术对信号进行解码。我们的数值结果表明，与现有系统相比，所提出的基于spad的系统在误码率性能和可实现的数据速率方面具有优势。
In recent years, there has been a growing interest in exploring the application of single-photon avalanche diode (SPAD) in optical wireless communication (OWC). As a photon counting detector, SPAD can provide much higher sensitivity compared to the other commonly used photodetectors. However, SPAD-based receivers suffer from significant dead-time-induced non-linear distortion and signal dependent noise. In this work, we propose a novel SPAD-based OWC system in which the non-linear distortion caused by dead time can be successfully eliminated by the pre-distortion of the signal at the transmitter. In addition, another system with joint pre-distortion and noise normalization functionality is proposed. Thanks to the additional noise normalization process, for the transformed signal at the receiver, the originally signal dependent noise becomes signal independent so that the conventional signal detection techniques designed for AWGN channels can be employed to decode the signal. Our numerical results demonstrate the superiority of the proposed SPAD-based systems compared to the existing systems in terms of BER performance and achievable data rate.