Contents

comm.ConvolutionalDeinterleaver System object

Package: comm

Restore ordering of symbols using shift registers

Description

The ConvolutionalDeinterleaver object recovers a signal that was interleaved using the convolutional Interleaver object. The parameters in the two blocks should have the same values.

To recover convolutionally interleaved binary data:

  1. Define and set up your convolutional deinterleaver object. See Construction.

  2. Call step to convolutionally deinterleave according to the properties of comm.ConvolutionalDeinterleaver. The behavior of step is specific to each object in the toolbox.

Construction

H = comm.ConvolutionalDeinterleaver creates a convolutional deinterleaver System object™, H. This object restores the original ordering of a sequence that was interleaved using the convolutional interleaver System object.

H = comm.ConvolutionalDeinterleaver(Name,Value) creates a convolutional deinterleaver System object, H, with each specified property set to the specified value. You can specify additional name-value pair arguments in any order as (Name1,Value1,...,NameN,ValueN).

Properties

NumRegisters

Number of internal shift registers

Specify the number of internal shift registers as a scalar, positive integer. The default is 6.

RegisterLengthStep

Symbol capacity difference of each successive shift register

Specify the difference in symbol capacity of each successive shift register, where the last register holds zero symbols as a positive, scalar integer. The default is 2.

InitialConditions

Initial conditions of shift registers

Specify the values that are initially stored in each shift register as a numeric scalar or vector, except the first shift register, which has zero delay. If you set this property to a scalar, then all shift registers, except the first one, store the same specified value. You can also set this property to a column vector with length equal to the value of the NumRegisters property. With this setting, the i-th shift register stores the i-th element of the specified vector. The value of the first element of this property is unimportant because the first shift register has zero delay.

Methods

cloneCreate convolutional deinterleaver object with same property values
getNumInputsNumber of expected inputs to step method
getNumOutputsNumber of outputs from step method
isLockedLocked status for input attributes and nontunable properties
releaseAllow property value and input characteristics changes
resetReset states of the convolutional deinterleaver object
stepRestore ordering of symbols using shift registers

Examples

Interleave and deinterleave random data.

    hInt = comm.ConvolutionalInterleaver('NumRegisters', 3, ...
                    'RegisterLengthStep', 2, ...
                    'InitialConditions', [ -1 -2 -3]');
    hDeInt = comm.ConvolutionalDeinterleaver('NumRegisters', 3, ...
                    'RegisterLengthStep', 2, ...
                    'InitialConditions', [-1 -2 -3]');
    data = (0:20)';
    intrlvData = step(hInt, data);
    deintrlvData = step(hDeInt, intrlvData);

    % compare the original sequence, interleaved sequence and restored sequence.
    [data, intrlvData, deintrlvData]

Algorithms

This object implements the algorithm, inputs, and outputs described on the Convolutional Deinterleaver block reference page. The object properties correspond to the block parameters.

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