The 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 communications, in an effort to research and develop advanced information 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

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... eed network with 622/1,244 Mbit/s using a bent-pipe relay line. The three earth terminals, 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. After the launch of WINDS, NICT performed transmission 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 confirmed 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. This paper reports the configuration and performance of a 622/1,244 Mbit/s TDMA satellite communication system and the results of 622/1,244 Mbit/s TDMA satellite communication experiments using a highspeed burst modem. WINDS high-speed network system High-speed network We made progress in the development of a high-speed network using satellite lines. The purposes of this effort are to solve the digital divide, back up Internet backbone lines, and use temporary lines by installing mobile earth terminals in places where high-speed stationary lines are unavailable. The high-speed network of WINDS that operates in the bent-pipe TDMA mode is an SS (Satellite Switched)-TDMA system. Its system configuration is shown in Fig. 1 .