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One of the causes of intersymbol interference is multipath propagation in which a wireless signal from a transmitter reaches the receiver via multiple paths. The causes of this include reflection (for instance, the signal may bounce off buildings), refraction (such as through the foliage of a tree) and atmospheric effects such as atmospheric ducting and ionospheric reflection.
An optical communication system is any form of communications system that uses light as the transmission medium. Equipment consists of a transmitter, which encodes a message into an optical signal, a communication channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal.
A solution to interference problems in wireless communication networks is interference alignment, which was crystallized by Syed Ali Jafar at the University of California, Irvine. [1] A specialized application was previously studied by Yitzhak Birk and Tomer Kol for an index coding problem in 1998.
In general, communication disorders commonly refer to problems in speech (comprehension and/or expression) that significantly interfere with an individual's achievement and/or quality of life. Knowing the operational definition of the agency performing an assessment or giving a diagnosis may help. [3]
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Communications can also be lost when the Sun is blocking or behind one station in the same line of sight; Sun outages periodically interrupt communications with geosynchronous satellites. It is also a common problem for interplanetary space missions.
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Multipath propagation is similar in power line communication and in telephone local loops.In either case, impedance mismatch causes signal reflection. High-speed power line communication systems usually employ multi-carrier modulations (such as OFDM or wavelet OFDM) to avoid the intersymbol interference that multipath propagation would cause.