The visible light communication (VLC) by LED is one of the important methods because can work as high speed and VLC sends information flushing LED. We use pulse wave modulation for with be controlled easily microcontroller, which has digital output pins. At modulation, deciding low voltage middle when receiving signal level amplified equal to it threshold without amplification. In this paper, w...

Wireline and wireless communication devices (modems – DSL and cable and WiFi – and cellular radios) are the workhorses that drive the modern information age. Their central goal is to move around the basic digital currency of the information: bits. This movement is done on physical media, either via wires or via wireless. The key challenge is that the input-output relationship of the physical me...

This textbook presents the fundamental concepts underlying the design of modern digital communication systems, which include the wireline, wireless, and storage systems that pervade our everyday lives. Using a highly accessible, lecture style exposition, this rigorous textbook first establishes a firm grounding in classical concepts of modulation and demodulation, and then builds on these to in...

Supplementary section for Understanding Networked Applications: A First Course, Morgan Kaufmann, 1999. Copyright notice: Permission is granted to copy and distribute this material for educational purposes only, provided that this copyright notice remains attached. The underlying technology for transporting a bit stream on a communication link is digital communication. In networked computing, th...