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・ Polarity symbols
・ Polarium
・ Polarium Advance
・ Polarizability
・ Polarizable continuum model
・ Polarizable vacuum
・ Polarization
・ Polarization (album)
・ Polarization (economics)
・ Polarization (electrochemistry)
・ Polarization (politics)
・ Polarization (psychology)
・ Polarization (waves)
・ Polarization controller
・ Polarization density
Polarization division multiple access
・ POlarization Emission of Millimeter Activity at the Sun
・ Polarization identity
・ Polarization in astronomy
・ Polarization mixing
・ Polarization mode dispersion
・ Polarization of an algebraic form
・ Polarization ripples
・ Polarization rotator
・ Polarization scrambling
・ Polarization spectroscopy
・ Polarization-division multiplexing
・ Polarization-maintaining optical fiber
・ Polarized 3D system
・ Polarized light microscopy


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Polarization division multiple access : ウィキペディア英語版
Polarization division multiple access

Polarization division multiple access (PDMA) is a channel access method used in some cellular networks. Separate antennas are used in this type, each with different polarization and followed by separate receivers, allowing simultaneous regional access of satellites.
Each corresponding ground station antenna needs to be polarized in the same way as its counterpart in the satellite. This is generally accomplished by providing each participating ground 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.
== See also ==

* Frequency division multiple access
* Code division multiple access
* Time division multiple access


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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