transmit and receive using nuand bladerf simulink

[zainab tanveer]

hi
i want to transmit and receive data using nuand bladerf modulating it using OFDM underlying DPSK modulation, using simulink block of nuand bladerf, but the bit error resulting is very high like 70-80%,how can i optimize the system to decrease bit error rate.
I am new to using bladeRF, so there are many questions, please help me!
Thank you very much.