Convolutional Interleaver (Communications Blockset)

Permute input symbols using a set of shift registers

Library

Convolutional sublibrary of Interleaving

Description

The Convolutional Interleaver block permutes the symbols in the input signal. Internally, it uses a set of shift registers. The delay value of the kth shift register is (k-1) times the Register length step parameter. The number of shift registers is the value of the Rows of shift registers parameter.

The Initial conditions parameter indicates the values that fill each shift register at the beginning of the simulation (except for the first shift register, which has zero delay). If Initial conditions is a scalar, then its value fills all shift registers except the first; if Initial conditions is a column vector whose length is the Rows of shift registers parameter, then each entry fills the corresponding shift register. The value of the first element of the Initial conditions parameter is unimportant, since the first shift register has zero delay.

The input can be either a scalar or a frame-based column vector. It can be real or complex. The sample times of the input and output signals are the same.

Dialog Box

Rows of shift registers: The number of shift registers that the block uses internally.
Register length step: The number of additional symbols that fit in each successive shift register, where the first register holds zero symbols.
Initial conditions: The values that fill each shift register when the simulation begins.

Pair Block

Convolutional Deinterleaver

References

[1] Clark, George C. Jr. and J. Bibb Cain. Error-Correction Coding for Digital Communications. New York: Plenum Press, 1981.

[2] Forney, G., D., Jr. "Burst-Correcting Codes for the Classic Bursty Channel." IEEE Transactions on Communications, vol. COM-19, October 1971. 772-781.

[3] Ramsey, J. L. "Realization of Optimum Interleavers." IEEE Transactions on Information Theory, IT-16 (3), May 1970. 338-345.

Convolutional Encoder CPFSK Demodulator Baseband