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Encyclopedia > Communications channel

A Communications channel (or channel for short), models the medium through which information is transmitted from a sender (or transmitter) to a receiver. For example, in wireless communications, the channel is often modeled by a random attenuation of the transmitted signal, followed by additive noise. The attenuation captures the loss in signal power over the course of the transmission, and the noise in the model captures external interference and/or electronic noise in the receiver. Hence, depending on the application, the mathematical model for the communication system includes a model for the distortion introduced by the transmission medium, and termed the communication channel, or channel for short. Information is a term with many meanings depending on context, but is as a rule closely related to such concepts as meaning, knowledge, instruction, communication, representation, and mental stimulus. ... A source is one of the components of communication and information processing. ... The word receiver has a number of different meanings: In communications and information processing, a receiver is the recipient (observer) of a message (information), which is sent from a source (object). ...


Types of Communications channels

A simplex communication system is one where all signals flow in one direction. ... A duplex communication system is one where signal can flow in both directions between connected parties. ...

Topics for Expansion/Linking

See Also: Claude Shannon, Information theory, Shannon capacity, Shannon-Hartley law, Binary symmetric channel Business refers to at least three closely related commercial topics. ... Traditionally, marketing has been a term applied to the craft of linking the producers (or potential producers) of a product or service with customers, both existing and potential. ... The term communications is used in a number of disciplines: communications, also known as communication studies is the academic discipline which studies communication. ... Claude Elwood Shannon (April 30, 1916 _ February 24, 2001) has been called the father of information theory, and was the founder of practical digital circuit design theory. ... Information theory is a branch of the mathematical theory of probability and mathematical statistics, that quantifies the concept of information. ... In information theory, the Shannon-Hartley theorem states the maximum amount of error-free digital data (that is, information) that can be transmitted over a communication link with a specified bandwidth in the presence of noise interference. ... In information theory, the Shannon-Hartley theorem states the maximum amount of error-free digital data (that is, information) that can be transmitted over a communication link with a specified bandwidth in the presence of noise interference. ... In coding theory, a binary symmetric channel is an idealized model of a communications channel that sends bits. ...


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