Summary
International Symposium on Antennas and Propagation
2012
Session Number:4D1
Session:
Number:4D1-4
Effect of Depolarization on Dual-polarized Satellite Link with 16- and 32-ary Modulation Schemes
Kenta Takahashi, Hajime Fukuchi,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
We want to realize higher capacity satellite broadcasting. Then we should develop some kinds of technologies for increasing transmission quantity. In this research, we treat three kinds of technologies. Those are using future frequency bands which are 21GHz- and 42GHz-band, dual-polarization and more multi-level modulation schemes. But if we apply the technologies in those bands, raindrops can affect the technologies badly. So we assessed quantitatively dual-polarized satellite link in 21GHz- and 42GHz-band. Specifically we optimized APSK constellations of 16APSK and 32APSK. And to assess the attenuation effect of dual-polarization, we derive BER cumulative distribution from rain attenuation cumulative distribution, the relation between rain attenuation and XPD, and BER characteristics. Regarding multi-level modulation scheme, especially APSK constellation, we could optimize that, and we showed quantitatively it is enough with regards to only amplitude adjustment. In the near future, advanced technology will realize the APSK schemes. Regarding dual-polarization, we showed the effect of dual polarization on BER degradation is small enough in 21GHz-band and 42GHz-band. Cross polarization interference will not be critical cause of degradation. On the other hand, the most critical cause of degradation is rain attenuation.