AWR1843BOOST: Encoding and decoding matrices for BPM MIMO for simultaneous transmission

Ayush Shukla

Part Number: AWR1843BOOST

Tool/software:

Hello,

I have been trying to use AWR1843BOOST sensor in BPM MIMO mode, with all 3Tx acting simultaneously and all 4Rx receiving simultaneously.

I had a doubt , as in I see there could be multiple ways in which I can configure the 3 chirps (to form a subframe of length 3) : such as

A = S1 + S2 + S3 ; B = S1 + S2 - S3 ; C = S1 - S2 + S3

A = S1 + S2 +S3 ; B = -S1 + S2 - S3 ; C = S1 - S2 - S3

.. and so on , I feel there could be some more matrices such that they remain invertible.

Now , I want to understand how will the performance of the decoded data , or more so , the range, doppler velocity or angle (I think only angle , because according to TI we are to decode only after doppler fft).

I request anyone to please help me out over here , been struggling with this for some time now.

Thank you,

Ayush

3 months ago

0 Cesar 3 months ago

TI__Guru*** 149204 points

Hi,

Please see

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1122506/iwr1843boost-beamforming-vs-non-beamforming-transmit-power-conformity-with-fcc

Increased power will result in increased SNR, which means longer ranger and better angle estimation. The velocity will not be affected.

Thank you
Cesar

0 Ayush Shukla 3 months ago in reply to Cesar

Prodigy 20 points

Hi Cesar,

Thanks for replying

I am not sure what you mean to say , that thread doesn't seem related to my query..

I know that multiple antennas operating at a time will result in increased power -> better SNR & hence better detection.

But that isn't my doubt , my doubt is regarding the operating of such case ; in case of BPM MIMO -> to make use of all 8 Azimuth virtual antenna arrays (and 4 for elevation) ; I need to separate out the Transmitted power by Tx1,Tx2, Tx3 .. for that Coded modulation is performed, as per how I understand.

For this coding block , my concern is there could be multiple ways to do it, I read about Hadamard coding , but I also read that its to be done only for like 2x2 or 4x4 block ; whereas here its a 3x4..

Maybe you or someone from TI can help me regarding this..

Thank you,

Ayush

0 Cesar 3 months ago in reply to Ayush Shukla

TI__Guru*** 149204 points

HI,

Since this is a generic question, you would need to find this answer in radar signal processing textbooks or on signal processing forums.

We will let this thread open in case there are answers from other forum members

Thank you
Cesar

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AWR1843BOOST: Encoding and decoding matrices for BPM MIMO for simultaneous transmission