Complex input to IFFT to generate real value signal

Started by vcteo November 14, 2005
The statement in the subject is refering to Erich Cosby's tutorial for

I'm simulating OFDM in Simulink with the aim of later converting it
for a DSP.

I use BPSK before the OFDM operation. With BPSK, all my binary inputs
would be converted to either 1 or -1 in the IQ spectrum. In Simulink,
the outputs contain very small values for the imaginary part i in the
range of around -16
eg, binary 1 would be 1+1.22e-16i and binary 0 would be otherwise..

Would this small imag value be sufficient to fulfill the statement and
produce a real time signal? Would it cause any problems with the DSP