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mmWave radar sensors

Jiahui Gao
Expert 3890 points

Hi expert，

The customer's questions are as follows：

I‘d like to use self-designed waveform ,other than the FMCW waveform which is generated in the "ramp generator’ module in the TI off-the-shelf product..
For example, i want to deploy the OFDM radar waveform, which is digital synthesized in my USRP（Universal Software Radio Peripheral）and then fed into the TI off-the shelf product through some reserved interface.
Please give relevant suggestions，thanks.
Best Regards,
Jiahui
  • 0
    TI__Genius 13200 points

    Hello Jiahui,

    What kind of device/board are you using?

    Thanks,

    Ehtesham Shareef

  • 0
    TI__Genius 13200 points

    To answer your question,

    It would be Unlikely and very hard to use a self-designed waveform. The reason for this that there are various other timing parameters (Frame generation signals, ADC start time, ADC valid time etc )  so closely coupled with the Synthesizer signal and they interconnect. Timing correlations are done with the help of Ramp generator state machine and BSS firmware. It would be very hard to time synchronize all those signals w.r.t to external LO (Ramp generator) synchronized.

    Thanks

    -Shareef

  • 0 in reply to E. Shareef
    TI__Expert 3890 points

    Hi expert，

    Thank you for your quick reply.

    There is no specific board. The customer wants to do his own research and use his own waveform.

    I'll give your suggestion back to the customer and see what he reply.

    Thanks!

    Best Regards,
    Jiahui

  • 0 in reply to E. Shareef
    TI__Expert 3890 points

    Hi expert:

    Thsnks for your answer.

    Your concerns in the answer are mostly about timing and synchronization.

    What if the timing and synchronization are done through an external CLK. For example, we use a USRP to generate OFDM waveform which is fed into the TI mmWave radar product. At the same time, our USRP and the TI mmWave radar product use a single external CLK or oscillator. 

    I wonder if there are some interfaces reserved for the upper mentioned functionality.

    Wish for your reply.

    Much thanks.

    Best Regards,
    Jiahui

  • 0 in reply to Jiahui Gao
    TI__Genius 13200 points

    Let me reach out to the expert on this subject and get back to you.

    -Shareef

  • 0 in reply to E. Shareef
    TI__Expert 3890 points

    Hi expert,

    Ok. I'll wait, thank you!

    Best Regards,
    Jiahui

  • 0 in reply to Jiahui Gao
    TI__Genius 13200 points
    Hello Jiahui,
    Below is a summary of my discussion with our senior engineer on this matter:
    The challenge is not generating the OFDM waveform or 40MHz clock synchronization, But rather synchronization of  Sync, frame, ADC clocks, and many more internal control signals are closely coupled through the Ramp generator state machines which are controlled by the Device firmware and API configuration for the chirp generation.
     
    The APP-note below has more details.
     
     
    Below is the example of external signal for the synchronization.
     
     
    Below are the state machine controlled internal signals.
     
     
     
     
     
    Frame configurations are tightly coupled with the APIs set by the BSS firmware.
     
     
    It would be very hard to synchronize (external LO, internal state machine, timing for the control and software configuration APIs together) with external instrumentation. They are deeply intertwined together.
    Hope this helps,
    -Shareef
  • +1 in reply to E. Shareef
    TI__Expert 3890 points

    Hi expert,

    Thank you for your quick reply!

    Best Regards,
    Jiahui