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MMWCAS-DSP-EVM: Would Calibration matrix generated by 4 chip cascade work for less than 4 chips in the same board(MIMO USECASE)?

Asher Farooqui
Expert 1821 points
Part Number: MMWCAS-DSP-EVM

Hi, 

I'm trying to understand the calibration step of the EVM with mmwave studio. The calibration is done for 12 Tx and 16 Rx. Would the generated calibration matrix work for transmitters less than 12 or receivers less than 16 or do we have to calibrate again with the new setup? I'm disabling the number of transmitters and receivers by disabling the number of chips in the cascade board  The procedure says to refer to "signal_processing_4chip_cascade.pdf" (as shown) if I have questions about Antenna Calibration. However, there's no such file present in the mmwave studio installation folder. 

Can someone explain the first question and (if possible) attach the concerned PDF? Thank you.

  • 0
    TI__Guru*** 148334 points

    Hi,

    We should be able to provide you the file "signal_processing_4chip_cascade.pdf".

    It will be included in the next mmwave studio release

    thank you

    Cesar

  • 0 in reply to Cesar
    Expert 1821 points

    Hi Cesar, 

    I already have mmwave studio version 3.07. Is there a new version coming out soon? Can you please send the pdf in question in DM or email regardless? That would be really helpful. 

    Thank you

  • 0 in reply to Cesar
    Expert 1821 points

    Cesar,

    Any updates on the PDF?

    Thank you.

  • 0 in reply to Cesar
    Expert 1821 points

    Hi ,

    Any updates on the PDF or any news on the new release? It's been weeks. I'd appreciate any response at this point.

  • 0 in reply to Asher Farooqui
    TI__Mastermind 18470 points

    Hi Asher, 

    I am attaching a draft of the documents that will be added to the next release of mmWave Studio to help explain the Matlab post processing environment in more detail. 

    The calibration procedure outlined is a boresight virtual channel phase/gain calibration procedure. This is intended to calibrate the imbalances of all 12 TX x 16 RX virtual channels by observing the relative phase and gain of each TX channel as observed by each RX channel on a fixed target. After performing the calibration you can pick which of those specific 192 virtual channels to utilize or not. Our post processing example uses a subset of those virtual channel calibrations for azimuth/elevation angle estimation.

    Disabling individual devices (within the limits of cascaded functionality) is perfectly fine. You can also chose to disable individual TX or RX on devices. It just depends which antenna you want to utilize or not. 

    signalPrcesssing_userguide_4chipCascade.pdf

    Thank you,

    -Randy