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Original question:

IWR6843: Spec and 3D antenna design and BPM/TDM-MIMO Questions

AWR1843: How to configure the AWR1843+DCA1000 in BPM mode

user5996327
Intellectual 295 points
Part Number: AWR1843

Hi,

I am using AWR1843+DCA1000.  I want to use the BPM mode.  And I see that AWR1843 have 3 TX and 4 RX. My questions are:

1). Does the AWR1843 can be configured to 3 TX and 4 RX mode? I am using the mmwave_studio_02_00_00_02, mmwave_sdk_03_01_01_02.

     In the mmWave studio, it seems that only 1 TX or 2 TX can be configured.

2) How to configured the BPM mode?  I do not understand the exact meaning for this page. I look through" mmwave_studio_user_guide" but it only gives a rough explanation.

  • 0
    TI__Guru 69960 points

    Hi,

    In AWR1843, it supported BPM as well phase shoft features, where BPM proves zero to 180 degree of phase control and phase-shifter provides degree change of 5.6 unit.

    1) Did you enable Tx3 at channelConfig API under staticConfig TAB of Studio? If that is not enabled there the you can't configure BPM for that Tx.

    2) BPM feature is connected with each chirp and each chirp uses defined Tx antenna. So enable BPM you need to assign BPM to each of chirp index, using Studio here. And same steps for phase shifter also.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Intellectual 295 points

    Hi Jitendra,

    Thanks for your kindly reply. 

    For the first question, you are right. I can configure all the 3 TX now.

    For the second question, I am still confused. So

    a) the "BPM Chirp Config " and "Chirp based Phase Shifter" have the familiar function, so we can only used one of them each time. Either "BPM Chirp Config " or "Chirp based Phase Shifter". right? 

    b) what are the exact meaning for "Start index" and "End index"?

    Best regards.

  • 0 in reply to user5996327
    TI__Guru 69960 points

    Hi,

    a) As I mentioned earlier that BPM provides 0/180 degree of phase for each chirp (using specific Tx) whereas phase-shifter can provide much small phase difference from each of Tx (for selected chirp).

    b) BPM and phase shifter need to assign to each chirp with selected Tx. So you need to assign BPM/Phase-shift feature to each required chirp (out of 256) starting from start-index to end-index. This way using a single click you can configure range of chirps with same BPM/Phase-shift setting.

    Start/end Index paradigm is same as chirpConfig under SensorConfig Tab of mmWave Studio.

    I hope this resolves your query.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Intellectual 295 points

    Hi Jitendra,

    Thanks. I got it.

    Another questions. I tried to configure the BPM mode. 2 TX, 4 RX. some script as follow. How can I know if the configuration is right or not? 

  • 0 in reply to user5996327
    TI__Guru 69960 points

    Hi,

    I just got an update from the team that in the Studio PostProc it doesn't support BPM feature.

    You need to do it by your own Matlab script to remove the BPM codes while processing for specific chirp data.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Intellectual 295 points

    Hi Jitendra,

    Thanks for reply. 

    Last question. For 2 TX, which configuration determines whether the two antennas are sent at the same time or alternately？

    I configure 2 chirps and 2  Tx. TX0 with Chirp 0, TX1 with Chirp 1.

    With my own matlab code, I see that  the 2 TX work alternately. that is a TDM mode. So how can I configure 2 TX work at the same time?

    Thanks a lot.

  • 0 in reply to user5996327
    TI__Guru 69960 points

    Hi,

    To use 2 Tx together you need to configure that chirp config with both of Tx checkbox selected. chirp0 with Tx0 and Tx1 selected, then both of Tx are used while chirping chirp0.

    Regards,

    Jitendra