OFDM BPSK is available here: http://www.gaussianwaves.com/2011/07/simulation-of-ofdm-system-in-matlab-ber-vs-ebn0-for-ofdm-in-awgn-channel/

Extending it to OFDM-QPSK should be straightforward

A complete OFDM system simulation is available here:

A senior project by Paul Guanming Lin – OFDM system simulation

Hope this helps.

*×*