User`s guide

IFFT
5-235
Click here in the MATLAB Help Browser to open a Simulink model based on
the following diagram.
Conjugate Symmetric Input
When the block input is conjugate symmetric and you want real-valued
outputs, set the
Input is conjugate symmetric parameter, which also
optimizes the block’s computation method. A common source of conjugate
symmetric data is the FFT block, which yields conjugate symmetric output
when its input is real-valued.
Note If the IFFT block input is conjugate symmetric but you do not set the
Input is conjugate symmetric parameter, you do not get a real-valued
output. Instead, you get a complex-valued output with small imaginary parts.
12 3
24 6
36 9
4812
2.557.5
0.5– 0.5i– 1– i– 1.5– 1.5i–
0.5– 1– 1.5–
0.5– 0.5i+1– i+1.5– 1.5i+
1234
2.5 0.5– 0.5i– 0.5– 0.5– 0.5i+
1234,,,()
2.5
0.5– 0.5i–
0.5–
0.5– 0.5i+
12 3
24 6
36 9
4812
2.557.5
0.5– 0.5i– 1– i– 1.5– 1.5i–
0.5– 1– 1.5–
0.5– 0.5i+1– i+1.5– 1.5i+
Unoriented length-4 1-D vector input
Frame-based 4-by-3 output
Frame-based 4-by-3 output
Frame-based 1-by-4 output
Frame-based 4-by-1 output
Frame-based 4-by-3 input
Sample-based 4-by-3 nonrow input
Sample-based 1-by-4 row vector input
Compute IFFT of the row
Compute IFFT of the vector
Compute IFFT of each column
Compute IFFT of each column
Effects of Block Input Size, Dimension, and Frame Status on Block Output