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Reference.org
Quadrature-division multiple access
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<p>Quadrature-division multiple access (QDMA) is a radio protocol. The term combines two standard terms in <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a>, <a href="/facts/CDMA/o2RLKE4M">CDMA</a> and <a href="/facts/QPSK/TFnpYe64">QPSK</a>. </p>