Hi there,
I have a question in regards to calculating velocity when you have a BPM-MIMO implementation. As referenced in the below TI reference (especially page 7), BPM-MIMO is conducted by encoding the second chirp of the second Tx with 180 degrees. Once resolved through the procedure your documentation prescribes, you have two independent resolved chirps for each Tx.
My assumption is that since you took up two chirps to resolve the superimposed signal at the receiver, you want two chirps back in return (instead of two individual chirps... if that was the case you would just do an TDM-MIMO implementation). Therefore, I would append the resolved chirp together with itself for the creation of two resolved data sets of two chirp length for each Tx for processing. Is this correct?
Since each resolved chirp data set will have the same phase change across the chirps (because when you append the resolved chirp together with itself, they have the same angle), then how do you calculate phase difference across adjacent/consecutive chirps to calculate velocity for this BPM-MIMO implementation? Would you calculate the phase change across the first chirp of every resolved set of two chirps?
Thank you very much for the help. Also, please note that I am not using the onboard DSP chain. I am working on understanding an offline DSP chain implementation.
George
