how remove the effect of hermitian symmetric ???

3 次查看（过去 30 天）
abdullah qasim
abdullah qasim 2019-8-30
编辑： Matt J 2019-8-31
To remove the imaginary signal a hermitian symmetry is placed with the ifft as shown below
Xsym = ifft(Y,'symmetric')
My question is how to remove it in fft?
  2 个评论
David Goodmanson
David Goodmanson 2019-8-30
Hi abdullah,
do you mean removing it if all you have is Xsym? That would not be possible because of loss of information when using the 'symmetric" optiion.
abdullah qasim
abdullah qasim 2019-8-31
Yes, this is true, but should be used in the transmission system, but in the reception must remove its effect

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Matt J
Matt J 2019-8-31
编辑：Matt J 2019-8-31
This is equivalent to forcing conjugate symmetry in fft(),
Yfft = ifft(conj(Y),'symmetric')*numel(Y);
If Y is real, you can of course omit the conj.
  2 个评论
Matt J
Matt J 2019-8-31
编辑：Matt J 2019-8-31
Works fine for me:
>> Y=ifftshift([1.1 2.1 3 2 1]) %non-symmetric input
Y =
3.0000 2.0000 1.0000 1.1000 2.1000
>> Ysym=round(Y) %symmetric input
Ysym =
3 2 1 1 2
>> fft(Ysym) %ideal result
ans =
9.0000 2.6180 0.3820 0.3820 2.6180
>> Yfft = ifft(conj(Y),'symmetric')*numel(Y) %force symmetry
Yfft =
9.0000 2.6180 0.3820 0.3820 2.6180

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with Signal Processing Toolbox 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by