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Power-division multiple access (PDMA) scheme is based on using variable transmission power between users in order to share the available power on the channel. Examples include multiple SCPC modems on a satellite transponder, where users get on demand a larger share of the power budget to transmit at higher data rates.
Channel expansion theory (CET) states that individual experience serves as an important role in determining the level of richness perception and development towards certain media tools. It is a theory of communication media perception that incorporates experiential factors to explain and predict user perceptions of a given media channel. The ...
The inter-cell interference in cellular wireless communications is an example of an interference channel. In spread-spectrum systems like 3G, interference also occurs inside the cell if non-orthogonal codes are used. A unicast channel is a channel that provides a unicast service, i.e. that sends data addressed to one specific user.
Media multiplexity theory was a concept developed by Caroline Haythornthwaite, based on her observations in organizational and educational settings. The theory posits that the more communication channels one uses with another person, the stronger the bond with that person.
guided media—waves are guided along a solid medium such as a transmission line; unguided media—transmission and reception are achieved by means of an antenna. One of the most common physical media used in networking is copper wire. Copper wire to carry signals to long distances using relatively low amounts of power.
PowerVu is a conditional access system for digital television developed by Scientific Atlanta. [1] It is used for professional broadcasting, notably by Retevision, Bloomberg Television, Discovery Channel, AFRTS, ABS-CBN, GMA Network, and American Forces Network.
Synchronous channels are helpful for urgent situations especially in more vulnerable areas, while asynchronous channels are useful for governments and utility service providers in their attempts to amplify their crisis management messages and expand the reach of information related to evacuation and recovery.
Initially published in the 1948 paper "A Mathematical Theory of Communication", it explains communication in terms of five basic components: a source, a transmitter, a channel, a receiver, and a destination. The source produces the original message. The transmitter translates the message into a signal, which is sent using a channel. The ...