Adaptive Modulation
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Link adaptation, or adaptive modulation and coding (AMC), is a term used in wireless communications to denote the matching of the modulation, Channel coding|coding and other Signalling (telecommunication)|signal and Communications protocol|protocol parameters to the conditions on the radio link (e.g. the pathloss, the Interference (communication)|interference due to signals coming from other transmitters, the sensitivity of the receiver, the available transmitter power margin, etc.). For example, Enhanced Data Rates for GSM Evolution|EDGE uses a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel, and thus the bit rate and robustness of data transmission. The process of link adaptation is a dynamic one and the signal and protocol parameters change as the radio link conditions change -- for example in HSDPA in UMTS this can take place every 2 ms. Adaptive modulation systems invariably require some channel state...
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