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<p><a href="page.php?w=time-division_multiple_access">TDMA</a>, or <a href="page.php?w=space-division_multiple_access">SDMA</a>. Some advanced forms of transmission multiplexing combine frequency- and time-division approaches like <a href="page.php?w=orthogonal_frequency-division_multiplexing">OFDM</a> or <a href="page.php?w=code-division_multiple_access">CDMA</a>. In cellular telephone communications, the air interface is the radio-frequency portion of the circuit between the cellular phone set or wireless modem (usually portable or mobile) and</p><p>
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