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  • 1244 Mbps High-speed Network for WINDS Bent-pipe-relay Mode

    Paper ID



    • Yukio Hashimoto
    • Mitsugu Okawa
    • Takashi Takahashi







    The Wideband InterNetworking engineering test and Demonstration Satellite "Kizuna" (WINDS) was jointly developed by the National Institute of Information and Communications Technology (NICT) and the Japan Aerospace Exploration Agency (JAXA), and was launched successfully by the H-IIA Launch Vehicle on February 23, 2008 from the JAXA Tanegashima Space Center. \\ The WINDS has two communication modes, a regenerative mode using an onboard switch and a bent pipe relay mode using wideband transponders of 1100 MHz bandwidth. Japan and Ten Asian Cities are covered by nineteen fixed spot beams formed by two dishes of the multi-beam antenna and Asian Pacific Area is covered two scanning spot beams by the active phased array antenna. Receiving and transmitting beams can be switched by the on-board IF switch matrix at each time slot of the TDMA signals. Therefore, a satellite switching TDMA system can be constituted using the WINDS. \\ We are developing the earth station and the SS-TDMA terminal for the 1244 Mbps high-speed network using the WINDS bent-pipe-relay mode. The earth station installed in a vehicle with 2.4-m-diameter antenna was developed for the user data rate of 622 Mbps. The fixed earth station with 4.8-m-diameter antennas at the NICT Kashima Space Research Center was developed for the user data rate of 1244-Mbps. \\ The SS-TDMA terminal is consisted by a 622 Mbps/1244 Mbps dual data rate high speed burst modem and a burst controller/data interface. The 622 Mbps/1244 Mbps dual data rate high-speed burst modem was developed. The modem is designed by using the FPGA and the digital signal processing technology. A turbo process code $(120, 128)^{2}$ is used for forward error correction. The data interface of four gigabit Ethernet ports communicates with personal computers via a router. \\ The 622/1244 Mbps dual data rate high-speed modem was tested with the satellite in last year. In the test of 622 Mbps user data rate, the bit error rate of $10^{-10}$ was less than 10 dB of Eb/No. And it will be tested in the initial check-out that is performed 3 months, after the WINDS is launched. Overall performance of the 1244 Mbps high-speed network will be tested after initial check-out. This paper describes the 1244 Mbps high-speed network for WINDS bent pipe relay mode and results of tests using WINDS. \\