Igarss 2011 vancouver 29 th july 2011
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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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Igarss 2011 vancouver 29 th july 2011

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


Outline

Outline

  • Motivation and objectives

  • Sliding correlation principle

  • Implemented sounder topology

  • Performance assessment

  • System photos

  • Conclusions and further work

IGARSS 2011


Motivation

Motivation

  • Characterisation and modelling of radiowave propagation in doubly selective channels.

IGARSS 2011


Objectives

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.

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Sliding correlation principle 1 4

Sliding correlation principle (1/4)

Typical transmitter section

Typical receiver section

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Sliding correlation principle 2 4

Sliding correlation principle (2/4)

PN sequence generator

Real spectrum of a PN sequence at 500MHz

Auto-correlation of a PN sequence

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Sliding correlation principle 3 4

Sliding correlation principle (3/4)

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Sliding correlation principle 4 4

Sliding correlation principle (4/4)

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Implemented sounder topology

Transmitter block

Implemented sounder topology

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Implemented sounder topology1

Transmitter block

Implemented sounder topology

RF2052 development board

Frequency range: 300MHz to 2.4GHz

Resolution: 0.596Hz

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Implemented sounder topology2

Transmitter block

Implemented sounder topology

DPG2 and AD9739EBZ boards

Sampling frequency: 2500MSPS

14 bits resolution

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Implemented sounder topology3

Receiver block

Implemented sounder topology

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Implemented sounder topology4

Receiver block

Implemented sounder topology

6GHz Mixer – DM0408LW2

RF/LO Bands: 4 to 8 GHz; IF Band: DC to 2GHz; Losses: 5dB

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Implemented sounder topology5

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

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Implemented sounder topology6

Receiver block

Implemented sounder topology

Correlation Mixer – ZFM-2-S+

RF/LO Bands: 1 to 1000 MHz; IF Bands: DC to 1GHz; Losses: 6dB

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If performance assessment

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.

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If performance assessment1

Sounder parameters

IF Performance assessment

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If performance assessment2

Results (1/2)

IF Performance assessment

The system is able to distinguish multipath components separated by approximately 2ns.

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If performance assessment3

Results (2/2)

IF Performance assessment

Assessment of the dynamic range.

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Rf performance assessment

Test configuration

RF Performance assessment

  • Using the same sounder parameters as in the IF bench test.

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Rf performance assessment1

Results (1/2)

RF Performance assessment

The figure shows two components which correspond to the periodic repetition of the sequence.

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Rf performance assessment2

Results (2/2)

RF Performance assessment

The figures show preliminary results of Doppler measurements at

18.7GHz.

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System photos

IF-Stage (1/2)

System photos

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System photos1

IF-Stage (2/2)

System photos

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System photos2

RF-Stage (1/2)

System photos

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System photos3

RF-Stage (2/2)

System photos

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System photos4

Doppler measurement

System photos

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Conclusions

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.

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Further work

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


Igarss 2011 vancouver 29 th july 20111

IGARSS 2011

Vancouver – 29th July 2011

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

Thank you.

E-mails: [email protected]

[email protected]


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