Hello, I'm writing an application where I get the output of the IFFT operation, using the arm_cfft_f32 function from CMSIS-DSP library like this:
arm_cfft_f32(&arm_cfft_sR_f32_len128, out_ifft, 1, 1);
where out_ifft is a 128*2 element vector with Hermitian symmetry because I need a real output.
I prepare the same vector and I use it again in Matlab to check the results:
salidamod=ifft(ifftshift(vector,2),NFFT);
The ifftshift function swaps the left and right halves of the vector,and it's necessary due to the requirements of the Matlab ifft function. I get this results:
Only the even samples are wrong, and only reversed...It's strange and I don't know why it happens. Could someone explain me the reason, please?
Thank you in advance.
OK.