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Recent Activity on Space Communications Projects

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Presentation on theme: "Recent Activity on Space Communications Projects"— Presentation transcript:

1 Recent Activity on Space Communications Projects
- ETS-VIII, WINDS, and STICS ..- ETS-VIII WINDS STICS Nov. 13, 2008 Ryutaro Suzuki Space Communications Group New Generation Wireless Communications Research Center National Institute of Information and Communications Technology

2 Recent Activity on Space Communications Projects
Research Target of Space Communications R&D History of Satellite Communication Systems ETS-VIII project / STICS project WINDS project OICETS optical experiment Reconfigurable Repeater development

3 Research Target of Space Communications
Broadband Satellite Communication systems High speed multimedia services to home Solving digital divide, Disaster communication Mobile Satellite Communications in any time and any place ETS-VIII, Quasi-GEO Advanced Research for future broadband communications High speed optical communications Testing advanced technology in orbit just on time GEO-Platform system

4 R&D History of Satellite Communication Systems
Future 1950s 1960s 1970s 1980s 1990s 2000s Systems Commercial Service CS CS-2,CS-3 Ultra high-speed Space Start of Satcom R&D in Japan First National Com. Sat. Promotion of commercial use of sat. JCSAT Internet Sat. Highway Mar. 1989 WINDS Construction of a base for space information communications Dec. 1977 Superbird Feb. 23, 2008 Feb. 1992 COMETS ETS-VIII Commercial Service Tokyo Olympic Vide Transmission ETS-V Advanced Mobile Personal Com. From Mobile N-STAR Feb. 1998 Dec. 18, 2006 Mobile Satcom to ETS-VI LEO System NeLS Global Communications Quasi-Zenith Sat. High altitude communications High precision positioning Personal 1964 Aug. 1987 Personnel comm. Aug. 1994 BS ATS-1 First Domestic Broadcast Sat. Commercial TV Service Expansion of Services COMETS ETS-VIII Advanced 1966 Advanced Broadcast Broadcast Digital Audio BS-2 BS-3 High altitude /high quality Feb. 1998 2006 Apr. 1978 ETS-VI OICETS G-bit Laser Satcom Sat.-to-sat. space link Sputnik-1 Inter-satellite communication Laser Com. DRTS Sep. 2002 World's first artificial sat. Ultra high-speed optical communications Aug. 1994 Oct. 1957 ETS-VII Orbital remote inspection Nov. 1997 New space communication infrastructure Formation flight Geostationary platform Cluster Sat research

5 Recent Activity on Space Communications Projects
Research Target of Space Communications R&D History of Satellite Communication Systems ETS-VIII project / STICS project WINDS project OICETS optical experiment Reconfigurable Repeater development

6 Engineering Test Satellite VIII (ETS-VIII)
3 ton class satellite bus technology S-band deployable large reflector Advanced mobile Satellite Communications experiments: On-board Switch Ranging and Positioning experiment: High Accuracy Clock Launched on Dec.18, 2006 #5 #4 #3 #2 #1 3 beams are installed in ETS-VIII

7 Service Image of Advanced Mobile Communication
Satellite Phone Phased array feeder for large reflector antenna Onboard Signal Processor

8 Block diagram of ETS-VIII
S-band Tx-antenna ( 13 mf ) EIRP < 63.8 dBW Ka Feeder Link Satellite Onboard Switch BFN & PS Phased Array Feeder Ka-band Antenna ( 0.8 mf ) EIRP < 46 dBW G/T < 14 dBK TX BFN2 TX BFN1 SW Ka-band D/C Voice Mode TRX ・・・ SSPA 31units Ka LNA Ka TWTA Data Mode TRX PIM-LNA Reflector 13 mf RX BFN2 RX BFN1 LNA PS LNA 31 units SW S-band U/C, D/C ・・・ S-band Feeder Link High Accuracy Clock / RF unit L/S-band HAC Antenna 1 mf S-band Backup Rx-antenna (1m ) G/T < -6 dBK S-band Service Link High Accuracy Freq. Standard NICT JAXA NTT Malfunctions High Accuracy Time Exchange LNA Power Line Harness

9 Development of ground testing devices
Ka-band feeder link earth station S-band fixed station S-band mobile earth station Telemetry/Command system S-band phased array antenna for automobiles Ka-band feeder link earth station (antenna) Ka-band feeder link earth station (RF section)

10 Handheld Terminal for Voice Communication for ETS-VIII
Size: 58 mm (W) x 170 mm (D) x 37.5 mm (H) Weight:: 266 g (without battery) Because of LNA trouble of ETS-VIII, additional high gain transmission antenna should be needed to perform the experiments using Handheld terminals.

11 Uplink Improvement by using Digital Repeater Unit
ETS-VIII uplink trouble was recovered by developing a digital repeater unit which receive the signal from the Handheld terminal and re-transmit to ETS-VIII by using 60 cmf antenna. HAC Antenna (RX) G/T: dB/K Antenna Gain: 21.3 dBi 7 dBi (Patch Antenna) NICT Handheld Terminal 60 cmf Parabolic Antenna Gain: 21.5 dBi EIRP: 29.0 dBW EIRP: 0.2 dBW G/T: dB/K Digital Repeater Unit

12 DVB-SH Transmission Experiment by ESA
ETS-VIII Ku-band Ka-band NICT Kashima DVB-SH signal Sky Tower Satellite / Terrestrial Integration Experiment was carried out by using ETS-VIII. Base stations were installed in NICT, Sky Tower, and JVC factory. NICT Koganei S-band JVC Hachioji factory Mobile Test Van

13 Communication is available both
R&D of STICS (Satellite/Terrestrial Integrated mobile Communication System) The cellular phone doesn‘t reach in the mountainous area, the island, and the sea. Moreover, the cellular phone cannot occasionally be used because of the disasters such as earthquakes and typhoons by the damage of the base stations. In NICT, new R&D of the satellite/terrestrial integrated mobile communication system is started which is effective even at such situations. This system is called STICS (Satellite/Terrestrial Integrated mobile Communication System) via satellite Communication is available both via terrestrial

14 Technological Study Items of STICS
Geostationary Satellite Satellite Cell Service Link Technological items 1. Frequency sharing technology between satellite and terrestrial systems Cooperative frequency control technology Dynamic network control technology Ground cell Hotspot Feeder Link 2. Interference avoidance and frequency allocation technology between satellite and terrestrial systems Anti-saturation amplifier technology Low sidelobe technology Super multi beam forming technology Resource allocation technology WLAN base station Base Stations for feeder link Terrestrial base station Satellite gateway Network Terrestrial gateway Dynamic network control equipment 14

15 R&D for frequency sharing technology
between satellite and terrestrial systems Frequency sharing technology 1710 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 MHz IMT-2000 IMT-2000 IMT-2000 MSS MSS UP Down MSS: Mobile Satellite Services 1980 2010 Service link 2170 2200 Cooperative frequency control technology Dynamic network control technology Technology to improve the channel capacity, which control the communication resource* between satellite and terrestrial systems dynamically according to traffic distribution and variation. Network technology to control the resource dynamically and unity depend on the traffic between satellite and terrestrial systems. *communication resource, frequency, time, power and space

16 R&D for Interference avoidance and frequency allocation technology between satellite and terrestrial systems Anti-Saturation amplifier technology Low sidelobe technology Super multi beam forming technology Resource allocation technology Beam pattern of desired satellite cell Satellite (GSO) f4 f3 f2 f1 Network Satellite control equipment Terrestrial control equipment Terrestrial base station Feeder link station Satellite Same frequency interference from terrestrial system at adjacent satellite cell Same frequency interference from terrestrial system at adjacent satellite cell Desired wave or or Terminal Base station Satellite terminal Terrestrial terminal Base station Desired satellite cell Space guard band Adjacent satellite cell Terrestrial cell

17 Recent Activity on Space Communications Projects
Research Target of Space Communications R&D History of Satellite Communication Systems ETS-VIII project / STICS project WINDS project OICETS optical experiment Reconfigurable Repeater development

18 To resolve digital divide
Purpose of WINDS Features of WINDS 1.2 Gbps high speed satellite communication 155 Mbps broadband satellite communication for home Wide service area: Asia and Pacific region To resolve digital divide Contribution to digital divide 0% in Japan Contribution to resolving digital divide in Asia and Pacific region Disaster management satellite communication Back up of backbone (1.2Gbps) High definition image transmission from disaster area using portable USAT (antenna size : 45cmφ) Multicast service SHV (Super High Vision) distribution Telemedicine e-learning

19 WINDS broadband satellite communication experiments

20 History of The WINDS Gigabit Satellite R&D WINDS JAXA/NICT (2002 - )
CRL ( ) Ka-band Scanning Spot Beam Antennas On-board Switch - Development of new technology verification - Application demonstrations - Expansion of Broadband Networks - Collaborations among Asia-Pacific nations - Contribution to disaster mitigation Key technology development Onboard switch (ABS) Active phased array antenna (APAA) Multi-port amplifier (MPA) High speed burst modem R&D of key technologies Onboard processing & switching Scanning spot beam antenna

21 Development Schedule of The WINDS
Launched on Feb. 23, 2008

22 Unique Features of The WINDS
Very high data rate Wide bandwidth (1.1 GHz) High power multi-port amplifier (MPA) High gain spot beam antenna Very high data rate burst modem Flexible and wide coverage Active phased array antenna (APAA) Fixed multi-beam antenna (MBA) Rain attenuation compensation Flexible power allocation by MPA Internet connectivity Advanced baseband switch (ABS)

23 External view of WINDS Multi-beam antenna reflector
for domestic coverage (2.4 m) for S.E. Asia coverage (2.4 m) by courtesy of JAXA 2.4- ton satellite bus Ka-band active phased APAA array antenna (APAA) Rx APAA Tx APAA 650mm 540mm 470mm 290mm Total EIRP: 54.6 dBW (1-beam transmission) 52.1 dBW (2-beam transmission) G/T: 7.1 dB/K

24 Coverage of WINDS Hawaii can be covered by using APAA Fixed beams cover Japan and several South East Asian areas. APAA Scanning beams cover almost all areas visible from WINDS.` qqqqqqqqqqqqqq =0

25 Ground Terminals / Data Communication Rate
U/L WINDS Bent-pipe  ~622Mbpsx2 1.2 Gbps D/L Bent-pipe ~622Mbps LET >5mf LET >5mf SDR-VSAT 2.4mf SDR-VSAT 2.4mf ABS* DEM/ ATMS/ MOD 1.5~155Mbps 155Mbps HDR-VSAT 1.2mf HDR-VSAT 1.2mf Mbps 155Mbps USAT 45cmf USAT 45cmf ※:by NICT

26 High-speed network earth stations
4.8 m antenna of LET SDR-VSAT SDR-VSAT: Super high data rate-VSAT

27 Results of 622 Mbps transmission test

28 Experiment plan using WINDS
Basic Experiments Satellite developing organization (JAXA and NICT) plans and carry out Application Experiments MIC invited public proposals 53 experiments were adopted (30 international experiments) Tele-medicine, E-learning, Propagation, etc

29 Trunk Line Connection Experiment with Terrestrial Network
1.2Gbps high speed satellite link is connected with terrestrial network and is used as backbone link. Technical purpose To verify the compatibility between terrestrial IP network and satellite link (to examine the countermeasure against the degradation of throughput due to delay in the satellite link)

30 Access Link Connection Experiment with Terrestrial Network
Assuming the disaster, users connect to USAT via wireless LAN and communicate with Internet using WINDS.

31 NHK’s Super High Vision transmission experiment
This experiment uses the maximum performance of 1.2Gbps by using bent-pipe transponder. The data rate of SHV (Super High Vision) is 16 times ( 4 x 4 ) of normal high definition video images. The raw data rate of SHV is 24Gbps. →The SHV signal is compressed to 150~1,000 Mbps for transmission.

32 Recent Activity on Space Communications Projects
Research Target of Space Communications R&D History of Satellite Communication Systems ETS-VIII project / STICS project WINDS project OICETS optical experiment Reconfigurable Repeater development

33 Optical Space Communications (Research phase)
Multi-10 Gbps class optical space communications Quantum Communication experiment between ISS and Ground stations Inter satellite link ( GEO - LEO, LEO – LEO ) High speed feeder link for satellite communications Mechanical Tracking Equipment Laser Tracking Trial for Optical Comm. using HAPS

34 OICETS - Ground Laser Communication Experiments
Optical communication experiments between OICETS and NICT Optical Ground Station (OGS) were conducted in 2006 and 2008. To improve uplink and downlink performance under atmospheric turbulence, LDPC coding technology with multi-beam transmission are employed. OICETS (Kirari) Beam width of the OICETS laser is around 5 m. Optical terminal Laser from OICETS Moon Laser communications Laser from NICT OGS Wavelength: 800 nm-band Output power at aperture  - OGS: mW  - OICETS: 53mW Photo of uplink/downlink NICT OGS

35 Recent Activity on Space Communications Projects
Research Target of Space Communications R&D History of Satellite Communication Systems ETS-VIII project / STICS project WINDS project OICETS optical experiment Reconfigurable Repeater development

36 Objectives of SDR type Transponder (Research phase)
Technological demonstration of onboard software-defined radio system Versatile onboard modulator and demodulator (MODEM) with SDR technique. application proof of highly functional onboard transponder. application proof for next-generation communication satellite. Adaptable to latest communications technology with flexible link design and high data rate. Gracefully degradable equipment with functional redundant technique Reliability enhancement of onboard MODEM with software-defined radio flexibility. Introducing a soft fault decision process (multilevel, not “hard decision”) for extending mission equipment lifetime (autonomous fault decision and resource evaluation). Reducing redundancy by assigning a light load to partially “out of order” equipment with taking account of a required computational complexity disequilibrium in an onboard MODEM. Test bed in Orbit The architecture and the information for the OSDR programming will be opened. The first objective is to launch an onboard modem with a flexible link design and large bandwidth capable of being adapted to the latest communication technology. By loading a versatile modem that can be reconfigured via software or hardware configurations on a satellite, optimum modulation and demodulation methods and type of error-correcting code can be selected according to link conditions. In addition, the latest communication technologies and protocols can be added to the onboard modem by uploading new software or hardware configurations after the satellite has been deployed in space. With these features, the problem of rain attenuation can be overcome by establishing a broadband link with a higher carrier frequency, and high interoperability with terrestrial communication systems can be maintained by uploading new technology. The second objective is to take advantage of the flexibility of software-defined radio to ensure the onboard modem system has the required reliability. The current approach to ensuring the reliability of conventional satellite mission equipment is to use stand-by or triple-module redundancy, which requires two or three times the level of system resources for one piece of equipment or function. Essentially, specific mission equipment is required only when that function of the mission is being operated. This means that with conventional methods, the weight of the equipment continues to consume system resources whether the equipment is required or not. However, it is the function rather than the equipment that is essential. This inefficiency can be reduced by reconfiguration during orbit and by constructing mission equipment that carries out its required function on time. Total system redundancy can be decreased by using reconfigurable, versatile mission equipment that still provides the same level of reliability. The concept of degrading gracefully means that equipment problems are not regarded as losses of function but rather as reduced capability. The reuse of faulty equipment becomes a soft-fault rather than a hard-fault decision. Different levels of computational complexity are required to carry out various functions. Thus, by assigning a lighter load to a degraded piece of versatile mission equipment, satellite resources can be used more effectively. For example, demodulation processing and decoding forward error correction codes imposes higher computational costs than modulation processing and encoding codes. Thus, the lifetime of the whole system can be extended by assigning modulation processing and encoding to degraded equipment and demodulation processing and decoding to high-functioning equipment.

37 “TDMA”: Time Division Multiple Application
Mesh type connection Broadcasting, One way star type Baseband switching and Regenerative relay “Adaptive communication” mod/demod, codec, protocol and termination layer Emergency communication system Layer 3 switching + onboard PEP Onboard Web server system All in one with RECONFIGURATION

38 Conclusions NICT R&D items
Development of the Gbps-class ultra-high speed satellite communications system Development of next-generation mobile communications Research of the millimeter wave / optical high-speed transmission system Research of the fundamental technologies to improve reliability and/or flexibility of satellite communications systems Projects WINDS development ETS-V, ETS-VIII developments STICS project ETS-VI, COMETS: millimeter OICETS optical experiment Reconfigurable Repeater development


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