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Adjacent-channel interference: Adjacent-channel interference is interference caused by extraneous power from a signal in an adjacent channel. ACI may be caused by inadequate filtering (such as incomplete filtering of unwanted modulation products in FM systems), improper tuning or poor frequency control (in the reference channel, the interfering channel or both).
Adjacent channel: In broadcasting an adjacent channel is an AM, FM, or TV channel that is next to another channel. First-adjacent is immediately next to another channel, second-adjacent is two channels away, and so forth.
Adjacent channel power ratio: Adjacent Channel Power Ratio is ratio between the total power of adjacent channel (intermodulation signal) to the main channel's power (useful signal).
Adjacent-vertex-distinguishing-total coloring: In graph theory, a total coloring is a coloring on the vertices and edges of a graph such that: . no adjacent vertices have the same color; (2).