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1IntroductionNICT is conducting research and development of high-speed satellite communication using WINDS (Wideband InterNetworking engineering test and Demonstration Satellite, also known as “Kizuna”), launched in 2008[1]. In 2010, NICT succeeded in achieving a single carrier trans-mission rate of 1.2 Gbps by maximizing the 1.1 GHz band-width of WINDS’s Ka-band bent-pipe relay mode [2]. Also, we are developing an engineering ight model (EFM) for recongurable communication equipment (RCE: soware dened radio) [3] using SRAM-based FPGAs (Fig. 1). is is a satellite-equipped transponder whose circuits can be congured by uploaded circuit information from earth aer the satellite has been launched into orbit. To make recongurable communication equipment more compact and lightweight, we developed a 16APSK RF signal direct-processing transmitter and receiver [4]. We sought to expand on this and achieve broadband transmission using WINDS. Recently in high throughput satellites (HTS) [5][6] such as Inmarsat-5 [7], KA-SAT[8], Viasat-1, and Echostar 17, the total capacity per satellite is several tens to hundreds Gbps [9]. e data rate of each user link will be increased from a few tens Mbps in downlink and a few Mbps in uplink to several Gbps in the near future. is study took on the challenge of the highest data rate of Gbps in the both power- and frequency-band-limited 1.1 GHz band-width of WINDS’s Ka-band bent-pipe transponder. e improvement of the group delay distortion and the ampli-tude distortion as well as the ecient use of the limited bandwidth 16APSK/16QAM-OFDM (16-ary Amplitude and Phase-Shi Keying/16-ary Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing) was adopted. We developed a 16APSK/16QAM-OFDM 3.2 Gbps RF signal direct-processing transmitter and re-ceiver and achieved a 6.12×10-3 bit error rate through the WINDS satellite bent-pipe transponder. We added LDPC error correction to this system and succeeded in broadband transmission with a data transfer rate of 3.2 Gbps. Furthermore, we added a 10 GbE interface, connected a multi-channel video codec system, and succeeded in UDP/IP transmission of uncompressed 4K UHDTV [10].FiF1　RCE onboard software defined radio (EFM)The National Institute of Information and Communications Technology (NICT) has experimented using a 1,244 Mbps high-speed burst modem with single carrier QPSK modulation through the bandwidth of a 1.1 GHz transponder on the Wideband InterNetworking Engineering Test and Demonstration Satellite (WINDS). We developed a 16APSK/16QAM-OFDM 3.2 Gbps RF Signal Direct-Processing Transmitter and Receiver system for even greater broadband transmission. This paper shows that a 4K UHDTV transmission experiment using a WINDS satellite connection through a 10GbE interface was successfully performed by this system.3-5 16APSK/16QAM-OFDM 3.2 Gbps RF Signal Direct-Processing Transmitter and Receiver Transmission Experiments using WINDS SatelliteKenji SUZUKI, Masatomo YAHATA, Tetsuya WATANABE, Kenichi HOSHI, Tamio OKUI, Yoshiki ARAKAWA, Toshio ASAI, Tomoshige KAN, Takashi TAKAHASHI, and Morio TOYOSHIMA1113 Ultra-High-Speed Satellite Communication Technology