Thank you Alistu sir,
I have both the design comprising OS12 and OFDM mod. of optisystem 13 or 14 version.
Would you please suggest me how could i connect OFDM mod. to corresponding OFDM demod. In case of Multi-user design .. either we should connect ofdm mod. to ofdm demod. one by one in case of pilot and training ports i.e using 4 pair of OFDM mod. demod. pair for 4 user of using 4 port OFDM mod. but in this case we have problem of connecting pilot and training port because in transmitter section we have one 4 ports OFDm mod. but in receiver end we four 1 port OFDM demod. ..
seeking for response.