Restore ordering of input symbols using algebraically derived permutation
Block sublibrary of Interleaving
The Algebraic Deinterleaver block restores the original ordering of a sequence that was interleaved using the Algebraic Interleaver block. In typical usage, the parameters in the two blocks have the same values.
The Number of elements parameter, N, indicates how many numbers are in the input vector. This block accepts a column vector input signal.
The block accepts the following data types:
double, and fixed-point. The output
signal inherits its data type from the input signal.
The Type parameter indicates the algebraic method that the block
uses to generate the appropriate permutation table. Choices are
Welch-Costas. Each of these methods has parameters and
restrictions that are specific to it; these are described on the reference page for the
Algebraic Interleaver block.
The type of permutation table that the block uses for deinterleaving. Choices are
- Number of elements
The number of elements, N, in the input vector.
- Multiplicative factor
The factor the block uses to compute the corresponding interleaver's cycle vector. This field appears only when you set Type to
- Cyclic shift
The amount by which the block shifts indices when creating the corresponding interleaver's permutation table. This field appears only when you set Type to
- Primitive element
An element of order N in the finite field GF(N+1). This field appears only if Type is set to
 Heegard, Chris and Stephen B. Wicker. Turbo Coding. Boston: Kluwer Academic Publishers, 1999.
 Takeshita, O. Y. and D. J. Costello, Jr. "New Classes Of Algebraic Interleavers for Turbo-Codes." Proc. 1998 IEEE International Symposium on Information Theory, Boston, Aug. 16-21, 1998. 419.