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IWR6843: Can the Vital Sign lab be used with TX power at -10dBm?

Jesse Wang
Intellectual 2365 points
Part Number: IWR6843


Hi,

 I am checking the Industrial_Toobox Vital Sign demo lab, and I assume it uses default TX power at +10dBm for IWR6843.

 If I want to reduce the TX power to -10dBm, due to regulation power limit concern. Can I still detect one person's heart/breathing rate at 1.5m distance? This means the detecting SNR will be reduced by 20dB.

 In the Vital Sign demo GUI, the magnitude vs. range plot shows the peak power of detecting reflecting signal. Is this by SNR? What is its scale?

  • 0
    TI__Guru 50240 points

    Hi Jesse

    The scale is by relative magnitude, not dB.

    Also lab has not been tested with reduced Tx Power so I cannot confirm.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    TI__Intellectual 2365 points

    Hi Akash,

     Ok, if I calculate from signal strength point of view based on the training slide "" page 15.

     If the detecting range is shorter within 2m, then I can use the formula in page 15 for calculation.

     => 80m / 2m = 40.

     => taking log scale, I can get 10 * log (40)^4 =~ 64dB. 

     => the reflecting signal strength of 1m^2 RCS object at 2m will be almost +64dB larger than this object locates at 80m.

     If this assumption is correct, then it is still good enough for vital sign detection within 2m even I reduce the TX power by 20dB, right?

  • 0 in reply to Jesse Wang
    TI__Guru 50240 points

    Hi Jesse

    I cannot confirm. The Vital Signs lab detects the chest displacement of the subject and thus it will be challenging to perform. Only through evaluation will one be able to confirm this.

    Regards,

    AG