IWRL6432: Beamforming without BPM

Notozman

Expert 7536 points

Part Number: IWRL6432

Tool/software:

Hi team,

is it possible to enable beamforming (i.e. TX1+TX2 only) - not beam steering - without BPM ?

Customer just wants the addition 3dB TX gain with only 3 virtual channels to minimize the radar cube size.

Thanks.

3 months ago

0 Sharan S S 3 months ago

TI__Expert 4180 points

Hi,

We are looking into your query. Please allow us a day or two to respond back.

Regards

0 Josh Dye 3 months ago in reply to Sharan S S

TI__Mastermind 20881 points

Hi,

I don't think the SDK supports this by default but it might be possible with some changes to the DFP calls. I'll take a look to confirm and get back to you.

Regards,

Josh

0 Josh Dye 3 months ago in reply to Josh Dye

TI__Mastermind 20881 points

Hi,

Sorry for the delay here, I'm still checking on this. I have asked our firmware team if this is feasible and I'm waiting for a response. Thanks for your patience.

Regards,

Josh

0 Josh Dye 3 months ago in reply to Josh Dye

TI__Mastermind 20881 points

Hello,

This is not possible for the xWRLx432 devices as they do not have TX phase shifter support. We only have BPM for simultaneous transmission.

Regards,

Josh

0 Notozman 2 months ago in reply to Josh Dye

TI__Expert 7536 points

Thanks Josh,

Is this FW driven or HW artefact ? Have we had experience of customers changing the antenna lengths to compensate ?

0 Josh Dye 2 months ago in reply to Notozman

TI__Mastermind 20881 points

Hello,

The information I provided earlier is inaccurate, this is possible with IWRL6432.

See this description of c_ChirpTxMimoPatSel from the ICD ({MMWAVE_SDK5_INSTALL}\firmware\mmwave_dfp\docs\mmwave_dfp_interface_control_document.pdf), if this is set to ‘0’ then TX enable and BPM enable are controlled by h_ChirpTxEnSel and h_ChirpTxBpmEnSel.

And with h_ChirpTxBpmEnSel it is possible to match the same phase across TX by setting the same value for bits 0 and 1 (0 or 0x3).

Best regards,

Josh

0 Notozman 2 months ago in reply to Josh Dye

TI__Expert 7536 points

Thanks Josh, can you pls include the CLI commands needed ..

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IWRL6432: Beamforming without BPM