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Development and Performance Assessment of a Real Time High-Resolution RF Channel Sounder

IGARSS 2011 Vancouver – 29 th July 2011. Development and Performance Assessment of a Real Time High-Resolution RF Channel Sounder. David Ferreira, DL-IT Rafael Caldeirinha, DL-IT | IPL. Outline. Motivation and objectives Sliding correlation principle Implemented sounder topology

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Development and Performance Assessment of a Real Time High-Resolution RF Channel Sounder

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  1. IGARSS 2011 Vancouver – 29th July 2011 Development and Performance Assessment of a Real Time High-Resolution RF Channel Sounder David Ferreira, DL-IT Rafael Caldeirinha, DL-IT | IPL

  2. Outline • Motivation and objectives • Sliding correlation principle • Implemented sounder topology • Performance assessment • System photos • Conclusions and further work IGARSS 2011

  3. Motivation • Characterisation and modelling of radiowave propagation in doubly selective channels. IGARSS 2011

  4. Objectives • Design, implementation and test of a Swept Time-Delayed Cross-Correlation (STDCC) RF channel sounder. • Ease in adjusting key sounder parameters allowing to maximise its performance depending on the measurement scenario; • High time resolution of the channel impulse responses (2ns); • Ensure a good overall dynamic range; • Capability to measure multipath components in both amplitude and phase, allowing for Doppler spectrum analysis with post-processing. IGARSS 2011

  5. Sliding correlation principle (1/4) Typical transmitter section Typical receiver section IGARSS 2011

  6. Sliding correlation principle (2/4) PN sequence generator Real spectrum of a PN sequence at 500MHz Auto-correlation of a PN sequence IGARSS 2011

  7. Sliding correlation principle (3/4) IGARSS 2011

  8. Sliding correlation principle (4/4) IGARSS 2011

  9. Transmitter block Implemented sounder topology IGARSS 2011

  10. Transmitter block Implemented sounder topology RF2052 development board Frequency range: 300MHz to 2.4GHz Resolution: 0.596Hz IGARSS 2011

  11. Transmitter block Implemented sounder topology DPG2 and AD9739EBZ boards Sampling frequency: 2500MSPS 14 bits resolution IGARSS 2011

  12. Receiver block Implemented sounder topology IGARSS 2011

  13. Receiver block Implemented sounder topology 6GHz Mixer – DM0408LW2 RF/LO Bands: 4 to 8 GHz; IF Band: DC to 2GHz; Losses: 5dB IGARSS 2011

  14. Receiver block Implemented sounder topology I/Q Downconverter – HMC-C009 RF/LO Bands: 4 to 8.5 GHz; IF Band: DC to 3.5GHz; Losses: 9dB IGARSS 2011

  15. Receiver block Implemented sounder topology Correlation Mixer – ZFM-2-S+ RF/LO Bands: 1 to 1000 MHz; IF Bands: DC to 1GHz; Losses: 6dB IGARSS 2011

  16. Test configuration IF Performance assessment • Possibility to change the cable lengths, therefore the time delay associated to each multipath component; • Possibility to adjust the losses associated to each path. IGARSS 2011

  17. Sounder parameters IF Performance assessment IGARSS 2011

  18. Results (1/2) IF Performance assessment The system is able to distinguish multipath components separated by approximately 2ns. IGARSS 2011

  19. Results (2/2) IF Performance assessment Assessment of the dynamic range. IGARSS 2011

  20. Test configuration RF Performance assessment • Using the same sounder parameters as in the IF bench test. IGARSS 2011

  21. Results (1/2) RF Performance assessment The figure shows two components which correspond to the periodic repetition of the sequence. IGARSS 2011

  22. Results (2/2) RF Performance assessment The figures show preliminary results of Doppler measurements at 18.7GHz. IGARSS 2011

  23. IF-Stage (1/2) System photos IGARSS 2011

  24. IF-Stage (2/2) System photos IGARSS 2011

  25. RF-Stage (1/2) System photos IGARSS 2011

  26. RF-Stage (2/2) System photos IGARSS 2011

  27. Doppler measurement System photos IGARSS 2011

  28. Conclusions • The developed IF system can successfully distinguish multipath components separated by only 2ns and has a dynamic range around 50dB. • Despite the limitations caused by an RF faulty component, preliminary tests, both in bench as well in an anechoic chamber, show an overall dynamic range for the complete system (IF+RF) of close to 40dB. • By allowing an easy adjustment of the PN sequence properties, either in its length or chip rate, one can adjust the sounder specifications (e.g. dynamic range, time and Doppler resolutions, etc.) to the measurement scenario/geometry. IGARSS 2011

  29. Further work • Integration of the developed IF stage on other RF front-ends, namely (37, 60 and 300 GHz), allowing for high scalability. • Acquisition of a better data acquisition card, in order to improve the maximum detectable object speed through Doppler analysis of the measured PDP (currently limited to a maximum of 120Hz for a maximum discernible delay of 255ns). • Housing of the developed IF stage allowing for an easy relocation of the equipment over different measurement locations. IGARSS 2011

  30. IGARSS 2011 Vancouver – 29th July 2011 Development and Performance Assessment of a Real Time High-Resolution RF Channel Sounder Thank you. E-mails: david.ferreira@co.it.pt rcaldeirinha@estg.ipleiria.pt

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