RS Symbols

How many RS symbols are there in a normal RB in case of 2×2 MIMO?

In case of 2×2 MIMO if we consider that there are 4 Antenna ports / or 4 Channels to Estimate and 0th and 4th Symbol in each slot is being used for transferring the Reference Signal , 2 symbols in 1 RB so for 4 ports it should be 8 Symbols.

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