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Visible light communication (VLC) technology is a new type of wireless communication technology, which employs a light source as the carrier of information to realize illumination and communication simultaneously. This paper adopts a single InGaN/GaN-base multi-quantum well blue micro-light emitting diode (LED) as the light source, designs pre-emphasis circuit, LED driver circuit, impedance matching network, etc., and builds a high-speed real-time VLC system. It has been verified that the LED achieves a 3 dB modulation bandwidth of 450 MHz or more; and the real-time communication rate reaches over 800 Mbit/s at a distance of 2 m. The communication bit error rate (BER) is as low as at a communication rate of 622 Mbit/s. Experimental indicators including 3 dB bandwidth, communication rate, and communication BER are all taken into account. Therefore, this VLC system supports high-quality high-speed real-time communication. 相似文献
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为了便于人们及时感知无人值守的嵌入式Internet设备特定事件或异常的发生,就需要建立一种人机间的报警机制。该文提出了一种基于“嵌入式邮件发送平台”的解决方案,其主要思想是使嵌入式Internet设备通过精简的简单邮件传输协议(SimpleMailTransferProtocol,简称为SMTP)使用电子邮件Email的方式与SMTP邮件服务器进行通讯,把特定事件和异常信息直接从嵌入式设备发送到设备管理员信箱。该方案比传统方法减少了一个中间环节,从而降低了成本,提高了效率。 相似文献
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介绍了分数维造型的一些基本要求以及利用它绘制分形图的几种重要算法的原理和部分程序实现,对它们的优缺点进行了比较,阐述了它们分别适应的场合,并推导出了复平面域下某些一元高次多元式(族)其牛顿迭代关系式的Julia集的绘制公式,得到了一些较重要的结论。 相似文献
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