Polarization-division multiple access
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Polarization division multiple access (PDMA) is used in some cellular networks. Separate antennas are used in this type, each with different polarization and follwed by separate receivers, allowing simultaneous access of satellite from the same region of the earth.
Each corresponding earth station antenna needs to be polarized in the same way as its counterpart in the satellite. This is generally accomplished by providing each participating earth station with an antenna that has dual polarization. The frequency band allocated to each antenna beam can be identical because the uplink signals are orthogonal in polarization. This technique allows frequency reuse.