This file simulates OFDM using various modulations schemes The user chooses whether to use BPSK or QPSK ar 16-QAM. Then the code proceeds by inserting Cyclic Prefix and Pilot Signals This is followed by FFT (Fast Fourier Transform) A channel is simulated whether AWGN or frequency selective channel At the end the entire process is reversed and the BER is calculated and plotted for various SNR