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2-second delay. We also conrmed from Table 2 that sync-ing performance did not rely on the parameters of physical layers such as modulation schemes, etc.3Transmission Experiments Premised on 21 GHz Satellite Broadcasting3.18K multichannel transmissionse composition of the transmission experiments for 8K is shown in Fig. 7. On the transmitter side, we used the uplink earth station (transmitting antenna with a diameter of 4.8 m) at the NICT Kashima Space Technology Center, and on the receiving side, we set up a receiving antenna with a diameter of 2.4 m at the NHK Science & Technology Research Laboratories (NHK STRL) and received an 8K signal. For the transmission program, we sent the video signal, as an IP via the JGN2 plus test bed network, from an 8K camera mounted on the Sapporo TV Tower in Sapporo City to the NICT Kashima Space Technology Center, and achieved 8K live broadcasting. Furthermore, we prepared the other two 8K signals by streamers and broadcasted three multiplied 8K signals in total. Modulated signal aer multiplexing resulted in a 300 MHz-class broadband signal at a symbol rate of 250 Mbaud.e main transmission parameters of the wideband modem are shown in Table 3.From the transmission experiments for the WINDS satellite, we could verify 8K live broadcasting and multiple 8K programs per channel.3.2Strengthening synchronization performance by phase reference burst signalWith the current satellite broadcasting transmission system (ISDB-S), phase reference burst signal is employed TabT2　Syncing performance for time delayFiF7　Composition of transmission experiments for 8K multi programs (wideband transmission)Live 8K(1program)broadcastingSapporoTVTower（Sapporo,Hokkaido）22.2ch microphone array & 8K cameraObservatory at 90mNICT Kashima Space Technology Center（Kashima,Ibaraki）WINDSNHKSapporobroadcasting stationOpticaltransmissionUplink28.05GHz© JAXAVideo/audioencoding device8KstreamerPlaybackofpre-recorded8K(2programs)8K(3 programs)Viewing venueNHKSTRL（Setagaya,Tokyo）Downlink18.25GHzIPtransmissionSatellitetransmissionLTE (4K)Modulation schemeVSAT (2K)Modulation schemeVSAT (2K) Time delay0 sec1.0 sec2.0 sec3.0 sec4.0 sec16APSK (3/4) 16APSK (3/4) OKOKOKNGNG16APSK (7/9) OKOKOKNGNG32APSK (4/5) OKOKOKNGNG16APSK (7/9) 16APSK (3/4) OKOKOKNGNG16APSK (7/9) OKOKOKNGNG32APSK (4/5) OKOKOKNGNG32APSK (4/5) 16APSK (3/4) OKOKOKNGNG16APSK (7/9) OKOKOKNGNG32APSK (4/5) OKOKOKNGNG3 Ultra-High-Speed Satellite Communication Technology122　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)