muxintrlv
R2026b(To be removed) Permute symbols using shift registers with specified delays
muxintrlv will be removed in a future release. Use convintrlv instead. (since R2026b) For
information on updating your code, see Version History.
Syntax
intrlved = muxintrlv(data,delay)
[intrlved,state] = muxintrlv(data,delay)
[intrlved,state] = muxintrlv(data,delay,init_state)
Description
intrlved = muxintrlv(data,delay) permutes
the elements in data by using internal shift registers, each with its
own delay value. delay is a vector whose entries indicate how many
symbols each shift register can hold. The length of delay is the
number of shift registers. Before the function begins to process data, it initializes
all shift registers with zeros. If data is a matrix with multiple
rows and columns, the function processes the columns independently.
[intrlved,state] = muxintrlv(data,delay)
returns a structure that holds the final state of the shift registers.
state.value stores any unshifted symbols.
state.index is the index of the next register to be
shifted.
[intrlved,state] = muxintrlv(data,delay,init_state)
initializes the shift registers with the symbols contained in
init_state.value and directs the first input symbol to the shift
register referenced by init_state.index. The structure
init_state is typically the state output from
a previous call to this same function, and is unrelated to the corresponding
deinterleaver.
Examples
The example below illustrates how to use the state input and output when invoking
muxdeintrlv repeatedly. Notice that [deintrlved1;
deintrlved2] is the same as deintrlved.
delay = [0 4 8 12]; % Delays in shift registers symbols = 100; % Number of symbols to process % Interleave random data. intrlved = muxintrlv(randi([0 1],symbols,1),delay); % Deinterleave some of the data, recording state for later use. [deintrlved1,state] = muxdeintrlv(intrlved(1:symbols/2),delay); % Deinterleave the rest of the data, using state as an input argument. deintrlved2 = muxdeintrlv(intrlved(symbols/2+1:symbols),delay,state); % Deinterleave all data in one step. deintrlved = muxdeintrlv(intrlved,delay); isequal(deintrlved,[deintrlved1; deintrlved2])
The output is below.
ans =
1
References
[1] Heegard, Chris and Stephen B. Wicker. Turbo Coding. Boston: Kluwer Academic Publishers, 1999.
