Virtual Signals

Introduction -  Hi guys, Have you heard about modulation, what is mean by modulation, what are different types of modulation? I am sure you have if you are Engineering student.  So, in this blog we will discuss basics of modulation. So, our human voice signal contains the frequency up to 3 kHz and entire audible spectrum is between 20 Hz to 20 kHz. These low frequency signal called Baseband signal. Baseband signal can not be transmitted over long distance, we need to convert into high frequency signal to transmit over long distance. This high frequency signal is called Carrier signal. What is Modulation?   Modulation is a process of converting baseband signal into a signal that varies with one of its properties like amplitude, frequency, phase. We obtain modulated signal by adding carrier signal to baseband signal. Why we need Modulation? Reduce the antenna size – So, how we can reduce the size of the antenna, we will understand this point with the help of some basic ...

Hi guys, Hope you doing well, our todays blog topic is Spectrum. We heard about Spectrum in telecom filed at some point, so we will discuss about spectrum in this blog. What is Spectrum – 1. Spectrum refers to electromagnetic waves or range of frequencies we used for different applications. 2. Electromagnetic spectrum divided into radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma rays.     (Source - Wikipedia)   3. Frequency range for wireless communication is varies between 10 6  to 10 11  Hz. 4. If we talk about specific frequency range use for mobile communication in India, we have different range for 2G, 3G, 4G. Frequency range for GSM (2G) is 900 MHz and 1800 MHz. Frequency range for CDMA is 850 MHz. Frequency range for WCDMA (3G) is 900 MHz and 2100 MHz. Frequency range for 4G LTE (4G) is 850 MHz, 1800 MHz, 2300 MHz, 2500 MHz. Department of Telecommunication (DoT) allocates this spectrum to different...

Hi guys, Do you know who is responsible for handling telecommunication related functions and organize them in India. If you are not aware then this blog will give you brief information about Department of Telecommunication (DoT) which handles functions of telecommunication sector in India.                  (Source - Pixabay.com) So, let’s start, below points give you some basic information about DoT. Department of Telecommunications (DoT) -  1. DoT used to provide basic telecommunication services in India. This function was shifted to BSNL after its formation in October, 2000. 2. Presently, the main powers and responsibilities of the DoT Rules, 1961 are: 3. Formulation of policy, allocation of license and co-ordination with matters relating to telegraphs, telephones, wireless, data, facsimile and telematic services and other like forms of communications. 4. Co-operation with international bodies on matters related...