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Satellite modem
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=== Differential coding === {{Main|Differential coding}} There are several modulation types (such as [[phase-shift keying|PSK]] and [[quadrature amplitude modulation|QAM]]) that have a phase ambiguity, that is, a carrier can be restored in different ways. [[Differential coding]] is used to resolve this ambiguity. When differential coding is used, the data are deliberately made to depend not only on the current ''symbol'', but also on the previous one.
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