为降低室内环境光噪声,VLC模拟前端接收机设计了模拟滤波器

T. Adiono, Angga Pradana, Rachmad Vidya Wicaksana Putra, S. Fuada
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引用次数: 26

摘要

可见光通信(VLC)技术在室内的实现受到环境光和其他照明噪声(如荧光灯和灯泡)的挑战。环境光可以产生直流偏置或特定频率范围的信号。因此,我们提出在VLC模拟前端(AFE)接收器中设计模拟滤波器,以消除环境光噪声。提出的设计采用直流偏移去除,结合自动和手动调节模式。在自动模式下,我们使用fc = 10Hz的高通滤波器(HPF)设计模拟滤波器;同时,在手动模式下,我们利用电位器和差分放大器设计了直流阻塞参考电路。为了减少灯闪烁对信号的干扰,本设计采用fc = 100Hz的带阻滤波器(BSF)。仿真和实时实验结果表明,该设计能够有效地减少信号干扰和环境光。我们还使用PWM和BPSK调制来测试设计,以评估误码率(BER)性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analog filters design in VLC analog front-end receiver for reducing indoor ambient light noise
Visible Light Communication (VLC) technology in indoor implementation is challenged by ambient light and other lighting noise, such as fluorescent lamp and bulb. The ambient light could create a DC offset or signal with specific frequency range. Thus, we propose analog filters design in the VLC Analog Front-End (AFE) receiver that can eliminate the ambient light noise. The proposed design uses DC offset removal, incorporated with automatic and manual adjustment mode. In automatic mode, we design the analog filter using High Pass Filter (HPF) which have fc = 10Hz; meanwhile, in manual mode we design a reference circuit using potentiometer and differential amplifier for direct current blocking. For reducing signal interference from lamp flickering, the proposed design uses Band Stop Filter (BSF) which has fc = 100Hz. The experimental results, both simulation and realtime, show that our proposed design can reduce signal interference and ambient light. We also test the design using PWM and BPSK modulation to evaluate Bit Error Rate (BER) performance.
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