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Modulation is used to modulate baseband signal. Basically it is a technique used to generate a strong signal from a weak signal with help of a transporter signal known as carrier signal. A baseband signal is main source of any signal. It can be a sinusoidal wave or discrete pulse. In communication a baseband signal need to traverse long distance, but it become weak with respect to distance so that we need to add a carrier which carry the base band signal and send baseband signal to destination. A baseband signal pass through a modulator with carrier frequency then transmission starts, on other side demodulator demodulate signal and receive the original signal.   Practical example: If we through a paper it will traverse some distance but if we through it along with a stone it will traverse more distance. Here paper is baseband signal and stone is carrier. Basic signal modulation concept with carrier frequency There are three basic type of Modulation schemes which ...

In data communication, there are three types of communication styles; they are Simplex, Half-Duplex and Full-Duplex. Here we discuss about their characteristics with examples. Simplex: In this communication style data can send only and basically it is one way or uni-direction communication. This type of communication is not widely used for transmit trusted data because it can not send any error or control signal to sender terminal. This style of communication is vastly used in Radio and TV where we can see and hear or receive data only but we can not send any information data by the same channel. Half-Duplex: Half-Duplex is another type of communication style where data can and send and receive but not at the same time. In this communication type, if data is send from one end, then we can not send data from another that means communication establish in one direction.  This communication vastly used in walkie-talkie, intercom, string phone etc. The practical ...