Polarization-division multiple access
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PDMA
Separate antennas are used in this type, each with different polarization and follwed by separate receivers, allowing simultaneouss access of satellite from the same region of the earth.
Each corresponding earth station antenna needs to be ploarized 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 orthogonl in polarization.
This technique allow Frequency reuse.
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