In a case when the message produced by the information source is not electrical in nature, an input transducer is used to convert it into a time-varying electrical signal.For example, in case of radio-broadcasting, a microphone converts the information or massage which is in the form of sound waves into corresponding electrical signal.The function of the transmitter is to process the electrical signal from different aspects.For example in radio broadcasting the electrical signal obtained from sound signal, is processed to restrict its range of audio frequencies (upto 5 kHz in amplitude modulation radio broadcast ) and is often amplified.In wire telephony, no real processing is needed. Block diagram of a wireless communication link 2.2 Types of Systems In a mobile communication system at least one of the transceivers is mobile. of possibilities as “analog”. Communication is the process of establishing connection or link between two points for information exchange.Communication is simply the basic process of exchanging information.The electronics equipements which are used for communication purpose, are called communication equipments.
0000006549 00000 n Mobile phone is primarily designed for Voice communication. 0000002769 00000 n In 1946, FM mobile communications for the first public mobile telephone service Each system used a single, high-powered transmitter and large tower to cover distances of over 50 km. 0000000768 00000 n
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At ElectronicsPost.com I pursue my love for teaching. %PDF-1.2 %���� trailer << /Size 425 /Info 406 0 R /Root 408 0 R /Prev 296736 /ID[ Therefore, for these channels, the term point-to-point is used.On the other hand, the broadcast channel provides a capability where several receiving stations can be reached simultaneously from a single transmitter.An example of a broadcast channel is a satellite in geostationary orbit, which covers about one third of the earth’s surface.During the process of transmission and reception the signal gets distorted due to noise introduced in the system.Noise is an unwanted signal which tend to interfere with the required signal. Figure 4.1-1 presents a block diagram for a two-node, one-way M-ary communications system. This reproduction of the original signal is accomplished by a process known as the demodulation or detection. converts the electrical signal in the form of original sound signal.Hi! Basic types of systems include base/mobile, peer-to-peer, repeater, As we know, a communication system serves to communicate a message or information. 0000004747 00000 n Now, we shall discuss the functioning of these blocks. 0000007194 00000 n Wire-lines operate by guided electromagnetic waves and they are used for local telephone transmission.In case of microwave links, the transmitted signal is radiated as an electromagnetic wave in free space. This information originates in the information source.In general, there can be various messages in the form of words, group of words, code, symbols, sound signal etc.
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Different communication equipments when assembled together form a Typical example of communication system are line telephony and line telegraphy, radio telephony and radio telegraphy, radio broadcasting, point-to-point communication and mobile communication, computer communication, radar communication, television broadcasting, radio telemetry, radio aids to navigation, radio aids to aircraft landing etc.In the most fundamental sense, communication involves the transmission of information from one point to another through a succession of process as listed below :Fig.1 shows the block diagram of a general communication system, in which the different functional elements are represented by blocks.The essential components of a communication system are information source, input transducer, transmitter, communication channel, receiver and destination.Now, we shall discuss the functioning of these blocks.As we know, a communication system serves to communicate a message or information. Demodulation is the reverse process of modulation carried out in transmitter.Destination is the final stage which is used to convert an electrical message signal into its original form.For example in radio broadcasting, the destination is a loudspeaker which works as a transducer i.e. ElectronicsPost.com is a participant in the Amazon Services LLC Associates Program, and we get a commission on purchases made through our links. In other words, we can say that the function of the channel is to provide a physical connection between the transmitter and the receiver.There are two types of channels, namely point-to-point channels and broadcast channels.Example of point-to-point channels are wire lines, microwave links and optical fibres. I am an M.Tech in Electronics & Telecommunication Engineering. (i) Information Source. 0000004143 00000 n 0000002449 00000 n Noise may interfere with signal at any point in a communication system. Optical fibres are used in optical communications.Although these three channels operate differently, they all provide a physical medium for the transmission of signals from one point to another point. 0000007273 00000 n About the Author: Nishtha Isha. It may be on board a vehicle that can move at high speeds, or it may be a handheld unit used by a pedestrian. In 1934,AM mobile communication systems for municipal police radio systems. Figure 2-1. 0000000711 00000 n Noise signal is always random in character. 0000013173 00000 n