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1Introductione Japan Aerospace Exploration Agency (JAXA) and the National Institute of Information and Communications Technology have developed “WINDS,” a communications satellite that enables super-high-speed data communica-tions, in an eort to research and develop advanced infor-mation networks based on the Japanese government IT strategy “e-Japan Priority Policy Program [1]–[3]”. An H-IIA rocket carrying WINDS was launched on Feb.23, 2008, at Tanegashima Space Center of JAXA.NICT developed the high-speed network with 622/1,244 Mbit/s using a bent-pipe relay line. e three earth termi-nals, Large Earth Terminal (LET) at NICT Kashima Space Technology Center and the two Super-high Data Rate Very Small Aperture Terminals (SDR-VSAT), were developed to construct a high-speed network with 622/1,244 Mbit/s. Also, a high-speed burst modem with high-performance FEC using turbo product code (TPC: (128, 120)2) for a 622/1,244 Mbit/s dual rate high-speed network terminal was developed.Aer the launch of WINDS, NICT performed trans-mission experiments with the 622/1,244 Mbit/s dual rate high-speed burst modem at 622/1,244 Mbit/s, and measured the BER characteristic and the UDP/TCP packet error rate. We also conrmed that the network operates normally as a TDMA satellite communication system in the 622 Mbit/s mode between the three terminals. We also succeeded in transmission experiments with 3D, 4K HDTV using this system. is paper reports the conguration and performance of a 622/1,244 Mbit/s TDMA satellite com-munication system and the results of 622/1,244 Mbit/s TDMA satellite communication experiments using a high-speed burst modem.2WINDS high-speed network system2.1High-speed networkWe made progress in the development of a high-speed network using satellite lines. e purposes of this eort are to solve the digital divide, back up Internet backbone lines, and use temporary lines by installing mobile earth termi-nals in places where high-speed stationary lines are un-available. e high-speed network of WINDS that operates in the bent-pipe TDMA mode is an SS (Satellite Switched)-TDMA system. Its system conguration is shown in Fig. 1. 3-4 622/1,244 Mbit/s Dual Rate High-Speed Burst Modem TDMA Satellite Communication ExperimentsMitsugu OHKAWA, Akira AKAISHI, Toshio ASAI, Norihiko KATAYAMA, Kazuyoshi KAWASAKI, and Takashi TAKAHASHIThe WINDS communications satellite was jointly developed by the National Institute of Information and Communications Technology (NICT) and the Japan Aerospace Exploration Agency (JAXA). Using an H-IIA Launch Vehicle, WINDS was successfully launched on February 23, 2008 to establish an advanced communications network. In addition, a 622/1244 Mbit/s high-speed network using the bent-pipe relay mode of WINDS was developed by the NICT. We designed and developed a 622/1244 Mbit/s dual-rate burst modem, a Large Earth Terminal (LET; diameter, 4.8 m), and two Super-high Data Rate Very Small Aperture Terminals (SDR-VSAT; diameter, 2.4 m diameter) for high-speed satellite communications experiments. After the launch of WINDS, 622/1244 Mbit/s transmission tests were conducted on this system. This paper discusses the experimental bit error rates (BER) and UDP/TCP packet error rates (PER) achieved using 622/1244 Mbit/s dual-rate burst modems over the WINDS satellite link. We also discuss three-terminal communication over the 622 Mbit/s time-division multiple-access (TDMA) satellite communication system. Also, 3D, 4K-HDTV transmission experiment was successfully performed by this system.1013 Ultra-High-Speed Satellite Communication Technology