IWR1443BOOST: How to reshape adc data when I apply TDM-MIMO

Sheeraz Ahmed

Part Number: IWR1443BOOST
Other Parts Discussed in Thread: IWR1642, DCA1000EVM, IWR1443

Good day,

I am currently using DCA1000EVM and IWR1443/IWR1642 for data capturing. I am able to process the data using the ReadDCA1000 script in matlab while (4RX, 1Tx) configuration is used. However, When I select the MIMO configuration (4Rx, 2Tx), the plots seem to provide double range similar to the discussion on the threads here. I am using the reshape command for the adc data as follows:

radar_data = reshape(adc_data,N_virtual, NSamp_chirp, Nchirp_frame, NFrames);

where N_virtual=NRx*NTx. Basically I want the order now as 8{N_virtual}*256{NSamp_chirp}*128{Nchirp_frame}*{X number of frames}

How can I reshape my adc data as above mentioned scheme. Right now its stored as below:

Thanks,

Regards,

Sheeraz

over 6 years ago

0 Alex Rivera over 6 years ago

TI__Intellectual 2885 points

Sheeraz,

Use number of RX instead of N_virtual, because Nchirp_frame should already contains number of tx info.

Alex

0 Sheeraz Ahmed over 6 years ago in reply to Alex Rivera

Intellectual 430 points

I see, since Nchirp_frame is 64 for Tx1 and 64 for Tx2 (alternating chirps for the Tx1 and Tx2). But, reshaping as you described means we incorporate the MIMO setup correctly ?. I doubt that since for instance, taking the range fft gives the twice range now which suggests that something is not correct.

Regards,
Sheeraz

0 Sheeraz Ahmed over 6 years ago in reply to Alex Rivera

Intellectual 430 points

Hi Alex,

I have one more question on adc data arrangement for TDM MIMO configuration. In the mmwave doxygen document, the TDM-MIMO adc data is arranged according to the transmitters , (chirp1,chirp3,chirp(N-1)) data is arranged for Tx1 first and then (chirp2,chirp4,chirp(N)) for Tx2 next. Is this order also used when capturing adc data over DCA1000EVM ? . What I understood is I can arrange the data as [4*samples fromTx1 ; 4*samples fromTx2], so it will be [8* samples], is it correct ?

Regards,
Sheeraz

0 Alex Rivera over 6 years ago in reply to Sheeraz Ahmed

TI__Intellectual 2885 points

Take a look at "xWR1xxx ADC Raw Data Capture" on page 7, here you will find information that will fit your configuration with 16xx or 14xx, with real or complex data, since it all depends on your setup.

Alex

Sensors

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IWR1443BOOST: How to reshape adc data when I apply TDM-MIMO