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Computer Science Notes On – Digital Communication – For W.B.C.S. Examination.
Digital communication is the process of devices communicating information digitally. This tutorial helps the readers to get a good idea on how the signals are digitized and why digitization is needed. By the completion of this tutorial, the reader will be able to understand the conceptual details involved in digital communication.Continue Reading Computer Science Notes On – Digital Communication – For W.B.C.S. Examination.
Audience
This tutorial is prepared for beginners who are interested in the basics of digital communications and who aspire to acquire knowledge regarding digital communication systems.
Prerequisites
A basic idea regarding the initial concepts of communication is enough to go through this tutorial. It will definitely help if you use our tutorial Signals and Systems as a reference. A basic knowledge of the terms involved in Electronics and Communications would be an added advantage.
In digital communication systems, baseband signals must be band-limited in the transmitter or the receiver. Although the bulk of baseband signal shaping and analysis is accomplished using digital signal processing (DSP), analog filtering is used in a number of places along the signal chain. For instance analog filters reduce the imaging of a digital-to-analog converter (DAC), filter out the high frequency noise of an RF demodulator or reduce the aliasing inputs of an analog-to-digital converter (ADC).
Typically, 3G communication systems (CDMA, GSM, UMTS or WiMax) feature a baseband channel bandwidth of 1.25MHz to over 20MHz. In this frequency range, discrete analog filters—those constructed with high speed op amps, resistors and capacitors—are sensitive to PCB layout parasitics, component tolerances and mismatches. The pitfalls of using discrete components can be avoided by using integrated, pin-configurable, precision analog filter ICs, such as the LTC6601-1/-2 and the LTC6605-7/-10/-14. The LTC6601-x is a single 2nd order lowpass filter and the LTC6605-x is a dual, matched filter.
Digital communication has proliferated in a big way in the previous years. Digital communication is the physical transfer of data over Point-To-Point or Point-To-Multipoint communication channel. It is transfer of discrete messages. Digital communication plays a vital role in today’s electronic world. In digital communication the data transfer rate depends upon it’scharacterictics.
Digital communication can be done over large distances through internet and other things. It provides facilities like video conferencing which save a lot of time, money and effort. Communications technology that intimidated many of us just a few years ago is now a part of everyday life. Think of the evolution of the cell phone in your pocket. In addition to changing our daily lives, the transformation in digital communications also raises important economic, public policy and societal questions.
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