Visible Light Communication (VLC) using Light Emitting Diodes (LEDs) has gained attention due to its low power consumption, long lifetime, and fast response. However, VLC suffers from optical noise generated by ambient light sources such as fluorescent lamps, which leads to waveform distortion and increased bit error rates (BER). In this paper, we propose two noise reduction methods for Digital Visible Light Communication (DVLC) systems. The first method exploits the periodic nature of interference caused by AC-powered-line illumination and reduces interference by subtracting sampled noise waveforms from the received signal. Second, inspired by Active Noise Control (ANC) techniques, an additional photodiode is introduced for noise reception, and subtraction circuits are employed to attenuate noise in real time. Experimental results show that both methods improve BER performance compared with conventional receivers, with the ANC-inspired approach achieving superior performance under all tested conditions.

翻译：利用发光二极管(LED)的可见光通信(VLC)因其低功耗、长寿命和快速响应特性而受到关注。然而，VLC易受荧光灯等环境光源产生的光噪声影响，导致波形失真和误码率(BER)升高。本文针对数字可见光通信(DVLC)系统提出两种降噪方法。第一种方法利用交流电源照明干扰的周期性特征，通过从接收信号中减去采样噪声波形来抑制干扰。第二种方法受主动噪声控制(ANC)技术启发，引入额外光电二极管接收噪声，并采用减法电路实现实时噪声衰减。实验结果表明，与传统接收器相比，两种方法均能改善BER性能，其中受ANC启发的方案在所有测试条件下均表现出更优的性能。