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P. Vanveerdeghem, B. Jooris, P. Becue, P. Van Torre, H. Rogier, I. Moerman, J. Knockaert

Reducing Power Consumption in Body-centric Zigbee Communication Links by means of Wearable Textile Antennas. P. Vanveerdeghem, B. Jooris, P. Becue, P. Van Torre, H. Rogier, I. Moerman, J. Knockaert Dept. of Information Technology Ghent University. Outline. Introduction Measurement setup

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P. Vanveerdeghem, B. Jooris, P. Becue, P. Van Torre, H. Rogier, I. Moerman, J. Knockaert

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  1. Reducing Power Consumption in Body-centric Zigbee Communication Links by means of Wearable Textile Antennas P. Vanveerdeghem, B. Jooris, P. Becue, P. Van Torre, H. Rogier, I. Moerman, J. Knockaert Dept. of Information Technology Ghent University

  2. Outline • Introduction • Measurement setup • Textile patch antenna • w-iLab.t testbed • Experiment description • Measurement results • General conclusions 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  3. Introduction • Wireless body-centric sensor networks • Smart fabric-integrated textile (SFIT) systems • FP6 Proetex Integrated Project • Professional applications vs. consumer applications • Patient health monitoring • Rescue worker monitoring • People localisation • Sports, gaming, etc. • Personal communication 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  4. Introduction • Reducing power consumption • Why? • Reducing costs • Smaller • Light-weight (smaller batteries) • How? • Large area fire fighter garmentto deply more efficient antennas • High gain • Large radiation efficiency • Textile patch antenna • Flexible, low weight, cheap, invisble and unobtrusive integration, etc 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  5. Introduction • Aim • Current literature about physical layer • Uncoded data transmission • Basic modulation schemes • Signal-to-noise ratio (SNR) • Bit error rate (BER) • Large complicated testbed / measurement devices • Novelty: • Combined characterization:physical layer + network layer • IEEE 8002.15.4 • Low-cost transceiver • RM090 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  6. Outline • Introduction • Measurement setup • Textile patch antenna • w-iLab.t testbed • Experiment description • Measurement results • General conclusions 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  7. Measurement setup • Textile patch antenna • Circularly polarized textile patch antenna • Single port • Aramid substrate • E-textiles • Antenna patch • Ground plane • FP6 Proetex integrated project • Integration into firefighter suit 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  8. Measurement setup Port 1 Port 2 • Textile patch antenna • Dual polarized textile patch antenna • Two ports • Two orthogonal polarizations • Flexible protective foam • E-textiles • Conducting textilesas antenna patch and ground plane • Fire-retardant protectivefoam as antenna substrate 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  9. Measurement setup • Textile patch antenna • Dual polarized textile patch antenna 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  10. Measurement setup • W-iLab.t testbed setup • Integration into firefighter suit • PCB antenna vs. textile antenna • RM090 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  11. Measurement setup • W-iLab.t testbed setup • indoor office environment (18x90m) • 200 nodes / 3 floors • Fire fighter • Normal walking speed – fixed path • 2 mobile nodes 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  12. Measurement setup • Experiment description • Antenna • PCB antenna • Integrated on mobile node • Textile antenna • Connected via cable to mobile node • Dual polarized antenna • Circularly polarized antenna 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  13. Measurement setup • Experiment description • Firefighter walking along green path • Time slot 1: TX broadcast (200ms) • All fixed nodes • Mobile nodes • Time slot 2-3: mobile node 1-2 • RSSI and node ID • Broadcast to all fixed nodes • RSSI values are recorded • Fixed and mobile nodes • Equal transmit power mobile nodes 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  14. Outline • Introduction • Measurement setup • Textile patch antenna • w-iLab.t testbed • Experiment description • Measurement results • General conclusions 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  15. Measurement results • Measurement 1 • Circularly polarized patch antenna • Packet loss Patch vs PCB antenna (33/18) 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  16. Measurement results • Measurement 1 • RSSI on fixed nodes • Patch  higher received power • Patch  less packet loss 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  17. Measurement results • Measurement 1 • Circularly polarized patch antenna • TX node  mobile nodes • RSSI on mobile nodes • Patch antenna • Received power ↑↑ • Received packets ↑↑ 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  18. Measurement results • Measurement 1  2 • Simular results circularly and dual polarized textile antenna • Indication potential benefits of textile antennas • Unfair comparison between both types of antennas (PCB and patch) • RF losses due to RF interconnect and cables • New separate PCB antenna 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  19. Measurement results • Measurement 2 • Circularly polarized patch antenna • Packet loss Patch vs PCB antenna (45/6) 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  20. Measurement results • Measurement 2 • RSSI on fixed nodes • Patch  larger received power • Patch  less packet loss 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  21. Measurement results • Measurement 2 • Circularly polarized patch antenna • TX node  mobile nodes • RSSI on mobile nodes • Patch antenna • Received power ↑↑ • Received packets ↑↑ 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  22. Measurement results • Measurement results - overview 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  23. Outline • Introduction • Measurement setup • Textile patch antenna • w-iLab.t testbed • Experiment description • Measurement results • General conclusions 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  24. Conclusion • Using flexible textile patch antennas • Comfortable to the wearer • Wireless link quality • Improvement both in transmit and receive mode • Reducing transmit power • Guaranteeing same amount of packet loss • Reducing power consumption • Reducing costs (less battery, etc) 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

  25. Conclusion • Future research • Avoiding RF losses • Integration transceiver on patch antenna • Combiningsereveral patch antennas • Power combiner • Front and back antenna • Polarization • One or more dual polarized antennas • Transmitting on both orthogonal polarizations • Questions? 2nd International Workshop on Measurement-based Experimental Research, Methodology and Tools

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