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AWR1843BOOST: Interleaving of the multiple emitter data in raw data acquired with dca1000.

jaknm
Prodigy 60 points
Part Number: AWR1843BOOST
Other Parts Discussed in Thread: IWR6843, AWR1843, AWR1243

Hi,

I use AWR1843BOOST and DCA1000 to acquire the raw data. I use this document -> https://www.ti.com/lit/an/swra581b/swra581b.pdf?ts=1685667660596&ref_url=https%253A%252F%252Fwww.google.com%252F

(page 10) to figure out the structure of the acquired data. Nevertheless I cannot find anywhere the description of how the data is structured when multiple emitters are being used. Namely, I use 4 receivers and 3 emitters and acquiring complex data. What is the structure of the acquired data in this case? How is the data from multiple emitters interleaved - in other words - how does the scheme on the page 10 in the link above change in this case?

Thanks,

Best,

jan

  • 0
    TI__Mastermind 32665 points

    Hi Jan,

    1) In the application note referred you can use all the sections for xWR16xx and IWR6843 device for AWR1843. 

    2) The data received will depend on the number of receivers that are active during that time frame. Based on that you will get I and Q data. Their storage is shown in the app note. 

    3) The number of transmitters will not change the data format. If only 1 is active or all 3 are active the data format will remain the same. 

    4) The data you will need to segregate as per the Tx used based on the MIMO scheme you are using. Maybe you use TDM or DDM. Based on that the data is then processed that way. 

    There is an application note on MIMO schemes which will helpful for you. 

    MIMO Radar (Rev. A) (ti.com)

    Thanks,

    Pradipta. 

  • 0 in reply to Pradipta Bandyopadhyay
    Prodigy 60 points

    Hi Pradipta,

    Thanks for your answer.

    1) Just to confirm - for 1843 I can use the same sections as AWR1243 and NOT AWR1643 - correct?

    4) How can I know if I use TDM or BPM? Is that a parameter I can specify?

    The origin of my question is that when I restructure the raw data into a cube of num_chirps x num_samples x num_virtual_antennas and do both fast and slow time ffts I see on the resulting range-doppler map three horizontally superimposed same signals. Can this be caused by the fact that I use BPM and wrongly restructure the data? I suspect that can be the case because based on the link you referred me to I see that BPM adds signals.

    Thanks,

    Best,

    jan

  • 0 in reply to jaknm
    TI__Mastermind 32665 points

    Hi,

    1) Yes, correct.

    4) No its not a parameter. It is based on how you design your chirping pattern. For example, if you emit from only Tx1 then Tx2 and then Tx3 and then repeat this pattern over the entire frame then it will be a TDM design. 

    So, you will need to check how you are transmitting the chirps in your use case. If your transmitters are emitting simultaneously then you will receive the superimposed signal on your receiver.

    Thanks,

    Pradipta.

  • 0 in reply to Pradipta Bandyopadhyay
    Prodigy 60 points

    Hi Pradipta,

    Thanks for your answer.

    Pradipta Bandyopadhyay said:
    So, you will need to check how you are transmitting the chirps in your use case.

    How can I check this in my sensor configuration?

    Best,

    jan

  • 0 in reply to jaknm
    TI__Mastermind 32665 points

    Hi,

    You will need to check your channel, profile, chirp configuration API's. Also need to check the Frame config API. 

    Please go through some example codes which is part of the SDK which will help you in understanding the configurations. Also the TI resource explorer will be helpful in understanding this for AWR1843.

    SDK User Guide : ti\mmwave_sdk_03_06_00_00-LTS\docs

    Radar Toolbox (ti.com)

    Thanks,

    Pradipta.

  • 0 in reply to Pradipta Bandyopadhyay
    Prodigy 60 points

    hi,

    Pradipta Bandyopadhyay said:
    Please go through some example codes which is part of the SDK which will help you in understanding the configurations.

    Would you be able to be a bit more specific as to *where* exactly I can check this (file, LoC)?

    thanks,

    jan

  • 0 in reply to jaknm
    Prodigy 60 points

    Pradipta,

    I am still confused about your claim that:

    Pradipta Bandyopadhyay said:
    1) In the application note referred you can use all the sections for AWR1243 device for AWR1843. 

    Namely, from what I understand AWR1843 uses 2 LVDS lanes as opposed to 4 lanes used by AWR1243?

  • 0 in reply to jaknm
    TI__Mastermind 32665 points

    Hi,

    Q) Would you be able to be a bit more specific as to *where* exactly I can check this (file, LoC)?

    Comment: ti\mmwave_sdk_03_06_00_00-LTS\packages\ti\control has example on how to use the mmwave and mmwavelink API's. The radar toolbox link shared previously has different use cases for AWR1843 where you can see various configurations on chirp, profile and frame configurations. 

    Also, you can run the OOB demo and check that implementation as well.

    Q) Namely, from what I understand AWR1843 uses 2 LVDS lanes as opposed to 4 lanes used by AWR1243?

    Comment: The data format for AWR1843 will be same as xWR16xx and IWR6843. 

    Thanks,

    Pradipta. 

  • 0 in reply to Pradipta Bandyopadhyay
    Prodigy 60 points
    Pradipta Bandyopadhyay said:
    Comment: The data format for AWR1843 will be same as AWR1243. 

    The above really confuses me since here (page 7) www.ti.com/.../swra581b.pdf it says that for 1243 *only interleaved* format is available but in the mmwave_sdk_user_guide pdf it says that for 1843 *only non-interleaved* format is available (page 20). Are you sure about your statements? They contradict the documentation.

  • 0 in reply to jaknm
    TI__Mastermind 32665 points

    Hi,

    Let me check again and confirm on this.

    Thanks,

    Pradipta.

  • 0 in reply to Pradipta Bandyopadhyay
    TI__Mastermind 32665 points

    Hi,

    I checked on this internally with the team. For AWR1843 please use the data format as provided for xWR16xx and IWR6843 in the application note. I will edit the previous responses to remove any confusion.

    Thanks,

    Pradipta.