论文标题
动态可见光通信系统的自动增益控制设计
Automatic Gain Control Design for Dynamic Visible Light Communication Systems
论文作者
论文摘要
对于动态可见光通信（VLC）系统，接收到光功率的波动很大程度上是由于VLC终端的快速移动。这种波动会导致模数转换器（ADC）的可能的信号剪辑和量化噪声，从而加剧了信噪比（SNR）和通信链路的可靠性。为了减轻这种效果，通常在接收器前端中引入自动增益控制（AGC）技术，以适应性地调节电信号强度。在本文中，我们考虑了AGC模型的VLC前端分析。基于该模型，理论上是AGC的一些设计原理：AGC索引$ M $，AGC最大增益$ G_ {max} $和AGC均衡范围$ dr $的影响。接下来，仔细实施了模拟AGC放大器，并通过BER实验证明了我们的AGC建模的有效性。最后，在具有不同速度的动态链路中证明了实时25mb/s的开关键（OOK）实验。实验结果表明，AGC可以稳定BER性能并以1m/s的速度提高系统性能。
For dynamic visible light communication (VLC) systems, received optical power fluctuates largely due to the fast movement of VLC terminals. Such fluctuations will cause possible signal clipping and quantization noise at the analog-to-digital converters (ADCs) and thus aggravate signal-to-noise ratio (SNR) and reliability of the communication link. To mitigate this effect, the automatic gain control (AGC) technique is often introduced in the receiver front-end to adaptively adjust the electrical signal strength. In this paper, we provided a VLC front-end analysis considering AGC model. Based on the model, some design principles of AGC are theoretically derivated: the effects of AGC index $m$, AGC maximum gain $g_{max}$ and AGC equilibrium range $DR$. Next, an analog AGC amplifier was carefully implemented and the effectiveness of our AGC modeling was proved through BER experiments. Finally, realtime 25Mb/s on-off-keying (OOK) experiments with AGC function were demonstrated in a dynamic link with different speeds. Experimental results show that the AGC can stabilize the BER performance and improve the system performance in the speed of 1m/s.
