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IWR1443: Zoom equations

Viktorija Cecil
Mastermind 18491 points
Part Number: IWR1443

Team, 

Can you please direct me where I can find zoom FFT algorithm (equations) for IWR1443boost?

  • 0
    TI__Genius 11405 points
    Hi Viktorija,

    The zoom-in is based on slow DFT mode of hardware accelerator (HWA) (check HWA user's guide for details)www.ti.com/.../swru527a.pdf
    After that interpolation is execuated in R4F to get finer resolution.

    In terms of the code, it's in data_path.c file. See the interpHwaParamCfg setting for slow DFT mode and MmwDemo_processInterpolation function for interpolation.

    Thanks and Regards,
    Michelle
  • 0 in reply to Michelle Liu
    TI__Mastermind 18491 points

    Michelle, 

    Thank you for a quick reply. Feedback from customer with follow up question is:

    If the zoom FFT is performed in HWA, the process time is too long even with ES3 chip, it lost the advantage of the IWR1443 chip on the two wire operation. What is the good suggestion for this?

    Thanks

    Viktorija

  • 0 in reply to Viktorija Cecil
    TI__Genius 11405 points
    Viktorija,

    I'm aware that customer is also asking the question in another thread. What kind of processing time customer is looking for?
    For the configuration of high accuracy lab, the frame period can be slightly shortened. I haven't done any research on how short that can be, but I think the statistics from GUI output can give you an idea how much margin there is.

    If that still doesn't give satisfactory result, what I can think of is to reduce number of neighboring bins for zoom in, current it's 2, may be reduced to 1. Also the zoom-in FFT is 16K, that can be reduced as well. It is a trade-off of power and performance though.

    Thanks and Regards,
    Michelle
  • 0 in reply to Michelle Liu
    TI__Mastermind 18491 points
    Hi Michelle,
    Thank you for your inputs. Sorry, I wasn't aware of a parallel thread..
    Thanks again.
    Viktorija