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Masahiro UMEHIRA Kiyoshi KOBAYASHI Yoshitsugu YASUI Masato TANAKA Ryutaro SUZUKI Hideyuki SHINONAGA Nobuyuki KAWAI
Current trend in telecommunications is "broadband" and "ubiquitous." To achieve this goal, satellite communications systems are expected to play an important role in cooperation with terrestrial communications systems. Along with the advancement of optical fiber transmission systems, the role of satellite communications was dramatically changed from long distance transmission to various applications utilizing unique features of satellite communications. This paper overviews recent Japanese R&D in satellite communications.