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IWR6843ISK: How the AoA works with TDM MIMO

Part Number: IWR6843ISK

Any document illustrate how the AoA works in TDM environment ?

Since it is TDM, the target object can be moved if it is not  sampling at same time, thus introduce  a phase shift also du to movement.

How that can be compensated ?

e.g. in ISK, we get 8 virtual horizontal antennas and 4 virtual vertical antenna. as : 

 

      9 10 11 12
-  -  O  O  O  O  -  - 

X  X  X  X  X  X  X  X
1  2  3  4  5  6  7  8

We have 3 groups, and 12 virtual antennas. Those 3 groups (1-4, 4-8, 9-12) are TDM, so sampled at different time.
How those 8 virtual antenna can be used to calc the AoA, since they are sampled at different time (1-4 and 5-8 are different).

And how the elevation calculated ? Which antenna Rx to use ? (3-6 and 9-12 ?) Again how the time different between virtual antenna compensated ?