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IWR1443BOOST: mmwave demo visualzier How to see power attenuation with OOB demo

Takuma Akimoto
Intellectual 640 points
Part Number: IWR1443BOOST

Hi,

My customer is using OOB Demo to see power attenuation when shielding objects (eg curtain etc) are placed in front of the target.
Relative power and PeakVal that can be seen in OOB demo were found to be the 2DFFT output value between the antennas and the peak value of the angle FFT, respectively.
I think that it can be just seen with these numerical values if signal attenuation, but it can not be seen with the power value (mw or dBm).
Please let me know how to see power attenuation using OOB demo.

Best Regards,
Takuma

  • 0
    TI__Mastermind 28055 points
    Hi Takuma,

    I am checking with an expert, and will get back to you shortly. The peak value returned is the detected power of the signal - note that this will change based on the shape and material of the object, the distance of the object, and filtering done on the device. The customer needs to ensure that the distance of the object and object remains constant for any comparisons they make. Likewise, the chirp configuration should not change for a comparison.

    Regards,
    Justin
  • 0 in reply to Justin Curewitz
    TI__Mastermind 28055 points

    Hi Takuma,

    Can you clarify the customer's procedure for me? I think they are following these steps:

    1. Get peak value for the detected point and the noise floor value
    2. Compute SNR as Peak Val/noise floor
    3. Compare SNR under different conditions.

    Is the above correct?

    Thanks,

    Justin

  • 0 in reply to Justin Curewitz
    Intellectual 640 points

    Hello,Justin

    Thank you for your reply.
    What my customers are trying to do is as follows.
    · Place a 30 cm square metal plate at a distance of about 1 m from the EVM
    · Make a thin shield (curtain, glass etc.) between the EVM and the metal plate and check how much power attenuation occurred.

    I will check and tell you if my customer can satisfy the above experiment by comparing SNR

    Best Regards,
    Takuma

  • 0 in reply to Takuma Akimoto
    TI__Mastermind 28055 points
    Hi Takuma,

    Does your customer still need support on this topic?

    Regards,
    Justin
  • 0 in reply to Justin Curewitz
    Intellectual 640 points
    Hi Justin,

    Sorry for the late my reply.

    My customers will only look at relative power and start to evaluate signal attenuation first.
    So Unfortunately, the method of calculating the SNR is no longer necessary, but I will ask you again questions as needed.

    Thank you for your support.

    Best Regards,
    Takuma