Visible light communications (VLCs) using light-emitting-diodes (LEDs) as communication devices have developed rapidly with the widespread deployment of solid-state illumination. However, the modulation bandwidth of LEDs is one of the dominant issues that limit the VLC system efficiency. Although plenty of techniques have been investigated to deal with this restriction, few people pay attention to the theoretical analysis of LED illumination process. The light-conversion concept shows significant influence on the white LED transmission modeling and receiving technologies. We propose an LED response modeling approach based on the white light generation process and its spectral characteristics, as well as the corresponding signal receiving methods. A dual-pole zero-forcing equalizer (ZFE) is designed, and the analytical signal-to-noise ratios (SNRs) of the output signal with different receiving processes are derived. Simulation results show that SNR is effectively improved by adopting the proposed ZFE, and the dual-pole equalizer can effectively improve system bit error rate performance with different transmission rate. Under the practical lighting scenario, transmission rate can reach up to 70 Mbps over a 1.5 m line-of-sight link. Meanwhile, a minimum data rate of 30 Mbps can be supported within a coverage area of 3 m in diameter.

中文翻译：

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基于发光二极管发射过程与机制的可见光通信系统接收与均衡研究

随着固态照明的广泛部署，使用发光二极管（LED）作为通信设备的可见光通信（VLC）迅速发展。然而，LED 的调制带宽是限制 VLC 系统效率的主要问题之一。尽管人们已经研究了大量的技术来解决这一限制，但很少有人关注LED照明过程的理论分析。光转换概念对白光 LED 传输建模和接收技术具有重大影响。我们提出了一种基于白光产生过程及其光谱特性的LED响应建模方法，以及相应的信号接收方法。设计了双极点迫零均衡器（ZFE），并推导出不同接收过程下输出信号的解析信噪比（SNR）。仿真结果表明，采用所提出的ZFE可以有效提高信噪比，并且双极点均衡器可以有效改善系统在不同传输速率下的误码率性能。在实际照明场景下，在1.5 m视距链路上传输速率可达70 Mbps。同时，在直径3m的覆盖范围内可支持最低30Mbps的数据速率。在 1.5 m 视距链路上，传输速率可达 70 Mbps。同时，在直径3m的覆盖范围内可支持最低30Mbps的数据速率。在 1.5 m 视距链路上，传输速率可达 70 Mbps。同时，在直径3m的覆盖范围内可支持最低30Mbps的数据速率。