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IWR6843ISK: Comparison of TDM-MIMO and BPM-MIMO

user6356280
Intellectual 315 points
Part Number: IWR6843ISK

After reading the following document, I understood that BPM-MIMO has better SNR than TDM-MIMO.

However, I do not fully understand why BPM-MIMO has a better SNR.

Could you please explain in detail why BPM-MIMO has a better SNR?

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

Best Regards,

  • 0
    TI__Mastermind 20681 points

    Hi, 

    I am looking into your question and will get back to you within the next 24 hours. Thank you for your patience. 

    Best Regards,

    Josh

  • 0 in reply to Josh Dye
    TI__Mastermind 20681 points

    In TDM-MIMO, the power that can be transmitted in each time slot is limited by the maximum power that can be radiated by one TX antenna. However, with BPM-MIMO, we allow simultaneous transmission on all the TX transmitters. This increases the total transmitted power per time slot. This translates to an SNR benefit of 10log10 (NumTX).

    Best Regards,

    Josh

  • 0 in reply to Josh Dye
    Intellectual 315 points

    Thank you for your answer.

    Let me ask an additional question.

    1. Am I correct in my understanding that the higher the total transmitted power, the greater the received strength compared to the noise, resulting in a higher SNR?

    2. I know there may be different numbers of transmitting and receiving antennas among MIMO radars, but regardless of the number of transmitting and receiving antennas, does the SNR benefit from 10log10? Or does (NumTX) mean that the higher the number of transmitting antennas, the higher the SNR?

    Best Regards,

  • 0 in reply to user6356280
    TI__Mastermind 20681 points

    Hi, 

    1. Yes, your understanding is correct. 

    2. Yes, 10log10(NumTX) means that the higher the number of TX transmitting at once the higher the SNR benefit will be. However, BPM mode in our out-of-box example supports simultaneous transmission for 2 TX antennas maximum. This means the SNR benefit from BPM mode will be 10log10(2)=~3dB.

    Best Regards,

    Josh

  • 0 in reply to Josh Dye
    Intellectual 315 points

    Thank you for your answer.

    I understand.

    But let me ask an additional question.

    I understand that BPM-MIMO has better SNR, but is there anything inferior to TDM-MIMO? (e.g., higher power consumption, etc.)

    Best Regards,

  • 0 in reply to user6356280
    TI__Mastermind 20681 points

    Hi, 

    I'm looking into this question and will get back to you shortly. 

    Regards,

    Josh

  • 0 in reply to Josh Dye
    Intellectual 315 points

    Thank you for your research.

    Do you need a little more time?

    Best Regards,

  • 0 in reply to user6356280
    TI__Mastermind 20681 points

    Hello, 

    My sincere apologies for the delay. 

    Regarding disadvantages of BPM compared to TDM, there are not many. The only thing which may be considered a disadvantage is that while your average transmit power is 3dB higher, your peak power is 6dB higher. So, if there is some limit that you have on peak power then this may need to be considered. 

    Best regards,

    Josh

  • 0 in reply to Josh Dye
    Intellectual 315 points

    Thank you for your answer.

    I understand.

    Now that my questions have been answered, I will close this thread.

    Thank you for your cooperation.

    Best Regards,