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AWR1843: AWR1843 Interference mitigation and dithering method

Henry Lin
Prodigy 220 points
Part Number: AWR1843

Hi:

  We are developing  some interference methods in automotive application using AWR1843 and we have already studied and tested

the algorithm in platform 2.1 (mitigation method) using 1843EVM board.

Q1: The mitigation performance  was not as expected, the noise floor still high and detection points are still missing,is there any suggestion?

Q2: What is the time cost using this mitigation algorithm? It seem need lot of computation between chirps and chirps. 

Q3: We change the interference mechanism using dithering and randomization method. We wonder to change the phase in each chirp, 

there are two APIs can control phase. (rlProfileCfg_t txPhaseShifter and rlRfPhaseShiftCfg_t) What is the different between?  Do I need to compensate the phase different 

before doppler FFT for each chirp, in other words, does the phase effect is reference at receive chain?

Thanks for reply.

Henry Lin

  • 0
    TI__Mastermind 31680 points

    Hello Henry Lin, 

    Sorry for the delay in response due to the Easter holidays. 

    Give us some time to look for this information for you, and we will get back to you within the next 24 hrs. 

    Hope that's okay.

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Prodigy 220 points

    Hi Ishita:

      Any suggestion for above questions?

    Another question, we change the start frequency between chirps and use the spectrum analyzer to confirm the chirp changes correctly with our design, 

    however, we need to compensate the phase effect for all antennas between hopping chirps and non-hopping chirps after Range FFT (before Doppler FFT)

    , The formula is 〖exp〗^((j2π (2Rf_shift)/c)), is that correct? I have implemented this method but there are more than one peak in doppler dimension after 2D FFT, There still some phase effect between hopping chirps and non-hopping chirps.

    Thanks for reply.

    R: Target's range

    f_shift: start frequency offset

    c: light speed

    Henry Lin 

  • 0
    TI__Prodigy 595 points

    Hi Team,

    May we follow up on the case? thanks

  • 0 in reply to Henry Lin
    TI__Expert 8275 points

    Hi Henry,

                 Thanks for your patience. To answer your question Q1. it seems the interference mitigation is not happening in the video which you have posted.

    For your Q2, we don't have a number as such for the mitigation algorithm. But can you please time it from your end. We can also try it our end.

    For your question on phase effect compensation, I did check with Systems team and they have mentioned as to use the formula exp(i*phaseShift(n)), where n is the nth chirp.

    Also, if possible can you share the parameters with us so as to try it out end.

    Let me know if you have any questions.

    Thanks and Regards,

    Akshay.