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Discussion Groups | Matlab DSP | Complex input to IFFT to generate real value signal
Technical discussion about Matlab and issues related to Digital Signal Processing.
Complex input to IFFT to generate real value signal - vcteo - Nov 14 21:56:00 2005
The statement in the subject is refering to Erich Cosby's tutorial for
OFDM.
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
implementation?
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