Antenna mapping to simulate MIMO OFDM

Hello Everyone,
I have trouble with antenna mapping in order to simulate MIMO OFDM.
Rather than antenna mapping, I use demux instead of it, but the problem is that the dimensions are being set to 2.
So, this is not valid because the total number of input and output elements are not the same.

As output of data mapper is a one dimensional vector with 2 elements.

Anyone can help for this?

Is it RTD tool?

RDT stands for what?:wink:

Do you mean Anritsu RTD? Doesn’t look like that…

It is with Matlab Simulink.