VLF-band Power Line Channel Sounding - PowerPoint PPT Presentation

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VLF-band Power Line Channel Sounding

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VLF-band Power Line Channel Sounding

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  1. VLF-band Power Line Channel Sounding David W. Rieken, Zhixi Li, and Chris Fleck Advanced Systems Research & Development Aclara Technologies, LLC St. Louis, MO, USA

  2. Summary VLF band (1-9 KHz) • Not regulated by the FCC • Legacy AMI systems (e.g. TWACS, Turtle) • Good signal propagation properties? • Signal frequency is higher than mains, but still low enough to permit long distance comms • Presents unique challenges to PLC because of low data rate and significant mains interference Overview • VLF-band channel sounding • Experimental setup • Survey results

  3. Channel sounding algorithm: signal model

  4. Channel sounding algorithm: transmitted signal

  5. Channel sounding algorithm: sounding procedure

  6. Channel sounding algorithm: periodic noise cancelation

  7. Experiment setup

  8. Experiment setup: transmission point

  9. Experiment setup: receive point

  10. Analysis: convolution with sounding signal Spreading signal so that it is orthogonal to mains makes detection in low SNR channels easy.

  11. Survey results: Illinois site

  12. Survey results: Missouri site

  13. SNR Analysis

  14. SNR analysis: Illinois site (7.2 mi link)

  15. SNR analysis: Illinois site (7.2 mi link)

  16. SNR analysis: Missouri site (25.2 mi link)

  17. SNR analysis: Missouri site (25.2 mi link)

  18. Survey results: SNR by band

  19. Conclusions Any VLF-band PLC system must • Accommodate a wide range of link strengths • Leverage higher concentrator data rates than endpoint data rates • Maximize system throughput, rather than instantaneous data rate Analysis shortcomings • Sampling rate offset • Time-varying channel IPR