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Range-azimuth heat map computation and MIMO antenna configuration

Michael Kagalenko
Prodigy 180 points

Part Number: AWR1642BOOST
Other Parts Discussed in Thread: AWR1642,

AWR1642 MMW Demo uses two TX antennas to double the number of angle bins in the range-azimuth heat map. The explanation

for MIMO processing assumes that the distance between TX antennas is four times the distance between the receiver

antennas, allowing to create the "virtual receiver" array of 8 antennas. However, the distance between TX antennas on

the board does not seem to be equal to four times the interval between the RX antennas

1) Could you point out the exact specification of AWR1642Boost antenna geometry? I assume that

design schematics for the board have that info, but they are in the Altium designer format, not that easy to view on Linux

2) Does the "heat map" calculation in MMW demo firmware performs simple fft along the receivers to resolve the angles, or

is some more complicated algorithm employed?

3) If it is fft, do you perform some correction for the nonuniform spacing between the MIMO "virtual antennas"

due to the distance between TX antennas not equal to four times the distance between the RX antennas?

Thank you for any help.

Mikhail

  • 0
    TI__Guru**** 153504 points

    Hi,

    Please review the documentation for the mmWave SDK Demo.

    Answer 1

    Antenna Layout

    file:///C:/ti/mmwave_sdk_02_01_00_04/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

    Answer 2

    AoA is described in same doc

    Answer 3

    Please read the doc

    thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 180 points

    Hello, Cesar,

    thank you for quick reply.

    > Answer 1

    > Antenna Layout

    f> ile:///C:/ti/mmwave_sdk_02_01_00_04/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

    I have  mmwave_sdk_03_02_01_02, and the documentation file you list does not have quantitative data

    on antenna layout, that is, dimensions in millimeters. Do you mean that the earlier version of SDK has

    this data in the documentation?

    > AoA is described in same doc

    Do you mean that AoA for detected reflections is the same as for the heat map pixels?

    Thanks,

    Mikhail

  • 0 in reply to Michael Kagalenko
    TI__Guru**** 153504 points

    Hi,

    Here is the Antenna Config information provided.

    If you need more information than this you need to have the right tools to be able to read the schematics.

    Regarding the algorithm please review the documentation

    thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 180 points

    Hello, Cesar

    I have installed the LTS release  02.01.00.04 in addition to the latest available version 03.03.00.03. The

    antenna configuration diagram with dimensions that you helpfully posted is included in

    ~/ti/mmwave_sdk_02_01_00_04/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

    but not in either

    ~/mmwave_sdk_03_02_01_02/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

    or

    ~/ti/mmwave_sdk_03_03_00_03/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html

    It looks like the LTS verson documentation is more complete than the one of the current release. Perhaps,

    there should have been some warning about this in the forum answer or SDK downloads page.

    Thanks,

    Mikhail