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Reference.org
Differential coding
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<p>In <a href="/facts/Data_communication/1yAhaANd">digital communications</a>, differential coding is a technique used to provide <i>unambiguous</i> signal reception when using some types of <a href="/facts/Modulation/aAXPjINv">modulation</a>. It makes transmissible data dependent on both the current and previous signal (or symbol) states. </p><p>The common types of modulation that may be used with differential coding include <a href="/facts/Phase-shift_keying/TFnpYe64">phase-shift keying</a> and <a href="/facts/Quadrature_amplitude_modulation/02j52SWG">quadrature amplitude modulation</a>. </p>