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CCS/IWR6843ISK: Improvement over Demo of IWR6842

kisub Jung
Intellectual 930 points
Part Number: IWR6843ISK

Tool/software: Code Composer Studio

Based upon IWR6843ISK's developer's guide, We hit the following issues as described.

§The heart-rate value might jump during measurements. This can be due to several reasons (e.g. noise, alignment issues, interference from other objects, breathing harmonics overlapping with the heart rate frequency etc.). If the subject stays stationary, the heart-rate values ultimately should converge to the correct value

§One reason the heart rate might display a wrong value is the presence of breathing harmonic overlapping the heart-rate spectrum region i.e. [0.8 – 2.0] Hz. In the current demo the 2nd breathing harmonic is cancelled. For example, if the person has a breathing rate of 26 bpm and the heart rate happens to be ~ 52 bpm it will be discarded as the algorithm will interpret this as a breathing harmonic rather than a correct heart-rate

Q1. Apart from Demo, how can we improve this issue? Any suggestion for algorithm or method?

Q2. in Demo, the only first chip in the frame has been used for processing, if I want to use two chirps, would it improve reliability or accuracy? And in performance respective, Can 6843 support two chirp processings?

Q3.  in Demo, TX-RX one pair has been used while all RX and TX antennas are enabled. If we use all the enabled antenna, how should we use it?

BR,

  • 0
    TI__Guru 50240 points

    Hi Kisub Jung,

    These are some good questions and I'll need to discuss this with my team, I should have an answer for you sometime next week.

    Cheers,

    Akash

  • 0
    TI__Guru 50240 points

    Hi Kisub,

    Q1. Apart from Demo, how can we improve this issue? Any suggestion for algorithm or method?

    Several academic literature exists trying to remove the breathing harmonics. Some of the techniques that can be tried are adaptive notch filtering, spectral peak tracking etc.

    Q2. in Demo, the only first chip in the frame has been used for processing, if I want to use two chirps, would it improve reliability or accuracy? And in performance respective, Can 6843 support two chirp processings?

    Multiple chirps in a frame can be averaged to increase the SNR. In terms of vital signs, multiple chirps might not significantly increase the reliability/accuracy.

    Q3.  in Demo, TX-RX one pair has been used while all RX and TX antennas are enabled. If we use all the enabled antenna, how should we use it?

    The demo measures the vital signs of a single person. Multiple TX-RX channels can be utilized to measure the vital signs of multiple people by adding additional processing to utilize the multiple channels to separate people in the angle domain.

    Cheers,

    Akash