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AWR2243: Understanding Radar Cube Size in Advanced Frame

Khai Trinh
Genius 4140 points
Part Number: AWR2243

HI Expert,

In Advanced Frame config where I have 1 sub-frame in a frame. 1 defined profile with 12 TX and 16 RX enabled in the system. There are 20 burst in a sub-frame and there are 128 chirps in the burst configured to chirp out of all 12 TX channels. I also want to loop over 64 times. My questions below:

1. How are 128 chirps being transmitted out of the 12 TX channels? My understanding is that all 12 TX channels transmit the 128 chirps simultaneously 12 at a time until the 128 chirps in the burst is exhausted before moving on to the next burst in the sub-frame. 

2. What is my number of virtual channels in this case?

3. What is my radar cube look like?

4. How can I map this configuration to Processor SDK?

5. Would normal frame config even work for this case if I don't want to use Advanced Frame Config?

Thanks,

--Khai

  • 0
    TI__Guru 69960 points

    Hi Khai,

    1. I hope you have selected all 3 Tx in the chirpCOnfig API for each of the device configuration. With that condition, all the four devices will transmit the chirp together from all the 3*4 Tx. Each of 128 chirps will be synchronized (given all of the devices are configured exactly same configs) and same goes for burst/frame.

    2. As all the 12Tx transmit together so the total virtual antenna will be the same as no. of Rx. It may differ if you use MIMO mode.

    3. Each of the devices will transmit the CSI-2 data for each of Rx antenna (128 [chirp] * 4 [Rx] * 256 [noOfSample assumed] * 2 [16bit each sample] * 2 [complex] *4 [cascade devices] )

    4. You need to change the similar configuration in the Processor SDK.

    5. WIth the given configuration you can switch it to legacy frame configuration as well.

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    Genius 4140 points

    HI Jitendra,

    Thanks for the answers. My follow up questions to your answers:

    1. In you answer to 1, I am assuming when you said all TXes will transmit together, you are describing the TxBF use case.

    2. In you answer to 2, you said MIMO may be differ. This is because MIMO transmission is TDA across the TX channels from all the sensors. TX channels are selectively transmitting in TDA fashion. Thus the number of virtual channels are nTX * nRX. Is my understanding correct?

    3. The radar cube size you have is for each steered angle in the case of TxBF. Am i correct?

    Thanks,

    --Khai

  • 0 in reply to Khai Trinh
    Genius 4140 points

    Also, what happens to the 20 bursts and 64 loops in the sub-frame? I didn't see you accounted for them in your calculation of the radar cube?

    Thanks,

    --Khai

  • 0 in reply to Khai Trinh
    TI__Mastermind 30245 points

    Khai

    1. All Txes together transmission will correspond to the TxBf usecase.

    2. Your understanding is correct.

    3. Jiten's answer was for each steered angle. Note the  way the frame is recieved in the TDA, the final data frame is for all steered angles.

    Thanks and Regards

    Piyali

  • 0 in reply to Khai Trinh
    TI__Mastermind 30245 points

    Khai

    You can refer to this picture to calculate the radar cube size:

  • 0 in reply to Piyali Goswami
    Genius 4140 points

    This resolved the issue.