AWR1843: MIMO

pengyang shen

Part Number: AWR1843

I have noticed the description of BPM-MIMO in the MIMO Radar document, which encodes transmitting signals.

I would like to know if a Radar has two transmitting antennas, A and B, and four receiving antennas, 1,2,3,4, and 1 receiving antenna receive signals from both A and B, then which signal is mixed with when mixing?A or B? Is it mixed with the original signal generated by the local oscillator?

If this is the case, so imagine this: I have two radar A and B, each one transmitting antenna receiving antenna, two radar in the same frequency band launch different coding signal, if the launch at the same time, I know there will be two radar phase error, this kind of situation to receive from B's signal, receives the signal from A, B can be separated out? And what about the mixing process? Please answer, thank you very much

over 2 years ago

0 Cesar over 2 years ago

TI__Guru*** 138329 points

Hi,

Please give us some time to review this question

thank you

Cesar

0 pengyang shen over 2 years ago in reply to Cesar

Prodigy 70 points

Thanks for your reply,I always wait for you

0 Sandeep Rao30 over 2 years ago

TI__Prodigy 565 points

The Local Oscillator (LO) generates only a single chirp signal (say S). This chirp is then sent to all the transmitters in the radar sensor. Each transmitter can only add a phase shift to the original signal S before transmitting. All received signals are mixed with S.

If multiple radars are transmitting simultaneously, it is best to stagger their transmissions in time so that their IF signals do not interfere.

if you want radar sensor B to meaningfully demodulate signals transmitted by radar sensor A then it is best they share the LO signal (as for e.g. in TI's cascade radar : https://www.ti.com/tool/TIDEP-01012)

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AWR1843: MIMO