A Study on Improvement of Service Availability of the 21-GHz Band Satellite Broadcasting using the Storage Reception (2002 Joint Conference on Satellite Communications(JC-SAT2002)--衛星通信技術及び一般)

概要

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The 21-GHz band, which has a 600-MHz bandwidth, will be available for satellite broadcasting from 2007. However, since rain attenuation in the 21-GHz band is much larger than that in the 12-GHz band, powerful countermeasures to improve service availability are ardently desired. Consequently, we are studying broadcasting systems equipped with storage devices to overcome the effects of such heavy rain attenuation in the 21-GHz band. We compare the performances of two systems, i.e., the time diversity scheme and the so-called "long block length interleave transmission scheme" proposed by us. Based on the obtained simulation results, we show suitable applications for the two systems. Finally, we describe a prototype apparatus that was designed and fabricated to verify effectiveness of the long block-length interleave scheme. In the apparatus, we used HDDs (hard disk drives) as storage devices. Since HDDs are not suitable for random access, such as interleaving, we invented "a double-stage interleave method". The successful demonstration of the apparatus using the method is reported.
社団法人電子情報通信学会の論文
2002-10-03