“hybrid communication systems, fso/rf and rof: reliable and scaled communications anywhere” -...
TRANSCRIPT
Hybrid communication systems
(FSO/RF and RoF):
reliable and scaled communications anywhere
Dr. Joaquín Pérez Soler*, Prof. Z. Ghassemlooy and Prof. Dave Smith
*Optical Communications Research groupNorthumbria Communications Lab
School of CEIS, Northumbria University
Newcastle-upon-Tyne, 5th May 2011
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Outline
• Scenarios
• RoF and FSO: a complementary solution
• RoF: just pump
• FSO: free and powerful
• RF/FSO : scalable communications
• Next?
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Scenarios
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Scenarios
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Scenarios
• Increasing number of new applications– HD streaming, (netflix ©, lovefilm ©, ....)
– mobile broadband, (social apps, chating apps, videocalls, ...)
– online gaming, (motion games , playstation network ©, ...)
– high data-rate apps
anywhere, anytime, any service
just be connected
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Some solutions: FTTx, 4G, ...
• Provide new access networks based in FTTx and Mobile
(4G, LTE-advance)
• Deploy new wireless technologies with high data rate in
short-medium ranges (UWB, WiMAX, 60GHz, ...)
• Research in complementary technology:
– Quick deployment // No license
– Secure backup service
– Low cost
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RoF & FSO: complementary solutions
• Radio-over-Fibre and Free Space Optical comms are
reliable access technologies
• RoF :
– Mature technology for Indoor/Outdoor scenarios
– Last mile access indoor networks
– Long-haul network to deploy base station feeding
– Just pump your radio signal over the fibre !!
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RoF: just pump
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WiMAX
UWB
PON
Central Office
Core network
•Long-haul networks
~>25 km integrated distribution
•Short-range indoor networks
>300 m integrated distribution
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*
* Perez, J.; Morant, M.; Beltran, M.; Llorente, R.; , "Performance of MB-OFDM UWB and WiMAX IEEE 802.16e converged radio-over-fiber in PON," .
MWP '09. International Topical Meeting on Microwave Photonics, September, 2009
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RoF & FSO: complementary solutions
• Radio-over-Fibre and Free Space Optical comms are
reliable access technologies
• FSO:
– License free, indoor/outdoor solutions
– Visible light communications, laser comms, ...
• RoF :
– Mature technology for Indoor/Outdoor scenarios
– Last mile access indoor networks
– Long-haul network to deploy base station feeding
– Just pump your radio signal over the fibre !!
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FSO comms
• Commercial products on MAN/LAN backbones (buildings links)
• New applications
– Ground-to-ground links (backbone access, disaster situations) (1 Gbps)
– Satellite links UL/DL/Inter
• Optical Inter-Satellite-Links: TerraSAR-X (launch Oct. 2006) (5.6 Gbps)
• Satellite-DL: OICETS – DLR-OGS (50 Mbps)
• Optical links from aerial platforms: Capanina Stratospheric Balloon – OGS (DLR)
(1.25 Gbps)
– Ground-to-air/air-to-ground (unmanned airborne vehicles, tactical comm)
– Airborne communications (A2A)
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Courtesy: NOVASOL Inc.Courtesy: Cablefree Solutions Limited.
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FSO under research
Replication of outdoor
conditions under lab
controlled environment
• Defining Link margin criteria
,fog zones, scintillation, ...
• Replication outdoor
environments
• FSO chamber results (dots)
fits theory FSO fog models (lines)
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0.2 0.36 0.67 0.85 0.92 10
1
3
5
6
Trasmittance
Lin
k M
arg
in (
dB
)
Ptx = -1.32 dBm
Thick fog
V = 70 - 250 m
Lightfog
V = 500 - 1000 m
Dense fog
V = 25 - 70 m
Moderate fog
V = 250 - 500 m
BER<10e-6 limits is Q = 4.6
* S. Rajbhandari, Z. Ghassemlooy, J. Perez et al., "On the study of the FSO link performance under controlled
turbulence and fog atmospheric conditions”, 11th International Conference on Telecommunications , CONTEL 2011
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Hybrid RF/FSO: scaled comms
• Weather, blocking path, sun ligth, multiple indoor access
• Channel/Media diversity as a solution
– RF + FSO : viable and effective mitigation technique under
extreme weather conditions, since fog and rain drastically affect
the FSO and RF links, respectively, but only insignificantly vice
versa, and rarely occur simultaneously.
• Apps:
– Indoor: Home access networks ( 5-play, GigaBit Wireless Access )
– Backup networks for last mile access, rural access, ...
– Disaster areas deployment, hard geographical environments, ...
– Scaled communications depending on your needs
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Apps: Home Access Network
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ADSL
FTTH
RLL
Mobile coverage
Office
Lounge
BedRoom
Indoor Free Space Optics
and/or Radio 60 Ghz
Home Gateway
PLC
RF/FSO bridge
(Mesh) radio/fso
Wireless HD
Power line, radio, visible light and infrared communications
Apps: Hybrid FSO-RF communications
>99.999 % link availability
• Free RF bands (WiFi, WiMAX, mmW)
Challanges:
Soft-switch RF/FSO
Atmospheric impairments replication
mmW RF band to improve range
Ring/Mesh network topology
New modulation schemes
FSO chamber
• FOG/Turbulence control
• RF – optic link
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Hot plates
Fan Fog MachineAperture
Heat controlRF txLASER tx
RF/FSO transmitter inside chamber
Hybrid FSO-RF communications
Use of COTS products• AD chip and boards
Soft vs. Hard switching• FPGA and µController
• Software Coding (raptor codes)
Custom RF devices• Antenna design
Implementation of hybrid RF/FSO network• Avoid weather impairments
• 100 % link availability
• Indoor replication
Analog Devices
evaluation board WiMAX
Commercial
Antennas
Custom antennas
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Next?
Coding and Software Switching in hybrid systems
60 GHz and THz signal generation
Efficient signal modulations formats
Visible vs IR vs Laser devices
FSO interface for improve LTE-advance range and
base networking (eNodeB) at special environments
Low cost deployments
• Indoor interfaces
• Optical Wireless home deployment
• Transceiver RF/FSO integrated
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Next?
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ACK’S
NCRLab and OCRG research team and facilities
VLC : Dr. Hoa Le-Minh’s team
FSO : Prof Zabih Ghassemlooy’s team
RoF : Dr. Wai-Pang Ng’s team
Prof. Z. Ghassemlooy and Prof. Dave Smith
EU COST IC0802
Northumbria Research Conference 2011
http://joaquinperezsoler.blogs.upv.es/
School of Computing, Engineeringand Information Sciences