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ICECS, Athens – December 15 th 2010

On the receiver system feasibility for mobile DVB – S applications in the Ku – Band (10.7 – 12.75 GHz) An Introduction to the Design methodology. A. Fouque 1 , J – B. Bégueret 1 , Y. Deval 1 , D. Belot 2 1 IMS Laboratory – University of Bordeaux, France

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ICECS, Athens – December 15 th 2010

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  1. On the receiver system feasibility for mobile DVB – S applications in the Ku – Band (10.7 – 12.75 GHz) An Introduction to the Design methodology A. Fouque1, J – B. Bégueret1, Y. Deval1, D. Belot 2 1 IMS Laboratory – University of Bordeaux, France 2 Innovation & Collaborative Research, STMicroelectronics, Crolles, France ICECS, Athens – December 15th 2010

  2. Outline Satellite Terminals • Objectives : • Contribution to the design of a low cost and low power Front – End to receive Digital Television on mobile handhelds ( laptop, multimedia player … ) • Contents : • Context and Motivations • Presentation of the suggested demonstrator • DVB – S standard and the system specifications • Front – End feasibility • Conclusion and perspectives ICECS 2010 A. Fouque

  3. How to receive TV on mobile devices ? ( 1 / 2 ) Satellite Satellite Earth Station Primary Distribution Network IPDC Head End MM Contents Terrestrial Repeater Broadcaster Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  4. How to receive TV on mobile devices ? ( 2 / 2 ) Satellite Satellite Earth Station Terminals Primary Distribution Network IPDC Head End MM Contents Terrestrial Repeater Broadcaster Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  5. DMB – T ( GB20600 – 2006 ) CMMB ( sTiMi ) DVB – SH ( DVB – H ) T – DMB ( S – DMB ) ISDB – T ( OneSeg ) DVB – H ( DVB – T ) UMTS MBMS / HSDPA Mobile Telecom MediaFLO ( Qualcomm ) Above 1 GHz ATSC M / H ( ATSC ) Below 1 GHz “ TV to Mobile ” : a lot of suitors ( standards ) ! 10.5 – 12.75 GHz Mobile DVB – S Terrestrial Broadcast S – DMB ( T – DMB ) Terrestrial & Satellite Broadcast Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  6. Why satellite reception on mobile devices ? Terminals • Advantages for receiving television via the Satellite : • Diversity of TV programs ( hundreds of digital channels ) • Optimum quality of digital sound and video • Availability of High Definition ( HD ) broadcast programs • Coverage of the whole European area • Advantages of mobile television : • Watching TV in motion ( in a car, a train … ) • Watching live broadcasts without staying at home • Having a light, compact device which allows the user to bring it whenever and wherever he wants. •  Mobile television : its development is in going with great perspectives and future … Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  7. Mobile application issues and requirements • Propagation environment : • Multipath from terrestrial reflections • Interferences and fading • Doppler Effect •  Optimal reception whatever the conditions • Mobile application requirements : • High level of integration ( compact ) • High flexibility • Low power consumption • Low cost •  Architecture and design improvements Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  8. Overall system description • A classical receiver : • Not appropriated for the targeted applications : • high power consumption due to the use of 2 converters • high cost • large area Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  9. Overall system description • The suggested demonstrator : • To overcome the environmental problems : multi – path , lack of information, noisy signal, losses • To meet the DVB – S requirements Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  10. Overall system description N – Array Antenna :Receive multiple signals Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  11. Overall system description N – Array Antenna :Receive multiple signals RF Front – End :Downconvert and recover the desired information Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  12. Overall system description N – Array Antenna :Receive multiple signals RF Front – End :Downconvert and recoverthe desired information Analog Processor [ 1 ]: - Calibrate the Front – End - Select the channel and demodulate the signal to baseband  SASP ~ Filter and Mixer behavior [ 1 ] F. Rivet, Y. Deval, J-B. Bégueret, D. Dallet, P. Cathelin, D. Belot, “The first experimental demonstration of a SASP-based full Software Radio receiver”, pp. 25 – 28, RFIC 2009 Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  13. Overall system description N – Array Antenna :Receive multiple signals ADC converter :Finalize the Digital Signal Processing RF Front – End :Downconvert and recover the desired information Analog Processor [ 1 ] : - Calibrate the Front – End - Select the channel and demodulate the signal to baseband  SASP ~ Filter and Mixer behavior Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  14. Overall system description  This work RF Front – End :Downconvert and recover the desired information  Innovative system due to phased array solutions, analog calibration, channel selection and baseband demodulation ! Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  15. DVB – S standard specifications • Standard specifications : • Characteristics of Digital broadcasting systems using satellite : • large frequency band to be received ( 1 – 2 GHz ) • high channels selectivity ( many unwanted channel interferers ) •  5 or 6 transponders around 11.7 GHz : system bandwidth = 200 MHz source : T. Copani, «A 12-GHz Silicon Bipolar Dual-Conversion Receiver for Digital Satellite Applications» , JSSC, vol. 40, N°6, June 2005 Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  16. Methodology for studying the feasibility of the Front – End • How to study the feasibility of the mobile HDTV Front – End ? • Select the components nature and parameters • Simulate the system performances ( Power Gain, Noise Figure, Linearity … ) To meet DVB – S requirements • Solve issues from the thinking about the system feasibility • Realize the design of critical blocks • Set – up for the receiver simulation : Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  17. Methodology for studying the feasibility of the Front – End • Diversity principle •  Phased array block diagram with N active elements • Combining signals coherently • Combining noisy sources incoherently ( decorrelated sources ) Diversity principle Simplified Front – End Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  18. Methodology for studying the feasibility of the Front – End Receiver Power analysis • Output power ( linear ) expressed as : • Theoretical total gain such as : • for a N – array receiver ( here, N = 8 ) where comb_c : coupling coefficients Gn : gain of each receiver N : number of receivers where Pin , Out : total Input / Output power ( dBm ) • Simulated Total gain VS. the system parameters : Total gain with Gain_mix = 10 dB Gain_LNA = 21 dB  G = 31 dB Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  19. Methodology for studying the feasibility of the Front – End Receiver Noise analysis ( 1 / 2 ) • Friis formula expressed as : • for a single receiver • Theoretical total NF defined as : • for a N – array receiver ( here, N = 8 ) Target NF = 0.6 dB where : (S/N)In , Out : Input / Output Signal to Noise ratios ( dB ) • Simulated Noise Figure (NF) VS. the system parameters : with G_LNA = 21 dB G_mix = 10 dB  attainable with CMOS technology • total NF Є [ 4 ; 5 ] dB with noisy antenna source • total NF Є [ 3 ; 4 ] dB with noiseless antenna source  Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  20. Methodology for studying the feasibility of the Front – End Receiver Noise analysis( 2 / 2 ) • Friis formula expressed as : • for 1 path • Theoretical total NF defined as : • for a N – array receiver ( N = 8 ) Target NF = 0.6 dB • Simulated Noise Figure ( NF ) VS. the system parameters : with NF_LNA = 4 dB NF_mix = 9 dB • when G_LNA > = 21 dB • total NF ~ ~ 7 dB with noisy antenna source • total NF ~ ~ 5 dBwith noiseless antenna source • Conclusion about the receiver noise analysis : • Difficulty to meet the noise requirements : • issue to be solved with design improvements and / or an additional block after downconversion Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  21. Methodology for studying the feasibility of the Front – End Receiver Linearity analysis • Total IIP3 expressed as : • for 1 path • for a N-array receiver • ( N = 8 ) • Total IIP3 VS. the system parameters : Target IIP3 = – 41 dBm optimal total IIP3 with Gain_mix = 10 dB IIP3_LNA = – 10 dBm  IIP3 = – 26 dBm  Improvement of the linearity thanks to diversity techniques … Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  22. Methodology for studying the feasibility of the Front – End Sum – up of the values for the overall system Gain improvement by 10 * log( N ) OIP3 improvement by 10 * log( N ² ) NF unchanged Target IIP3 = – 41 dBm Target NF = 0.6 dB Target Gain = 56 dB    Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  23. Conclusion and Perspectives • Status of this work : • Feasibility of the suggested demonstrator in spite of some thinking about its implementation • First prototype of antennas with promising first results • Impossible to meet noise requirements because of technology limitations despite the increase of antennas number •  Solution : to be improved with design enhancements and / or an additional block for reducing noise Average during the analog sampling ( patent pending ) Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

  24. On the receiver system feasibility for mobile DVB –S applications in the Ku – Band ( 10.7 – 12.75 GHz ) An Introduction to the Design methodology Thank you for your attention ! Context Demonstrator Specifications Feasibility Conclusion ICECS 2010 A. Fouque

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