The RSDecoder
object recovers a message vector
from a ReedSolomon codeword vector. For proper decoding, the property
values for this object should match the property values in the corresponding
RS Encoder object.
To decode data using a ReedSolomon decoding scheme:
Define and set up your ReedSolomon decoder object. See Construction.
Call step
to decode data according
to the properties of comm.RSDecoder
. The behavior
of step
is specific to each object in the toolbox.
Note:
Starting in R2016b, instead of using the 
creates
a block decoder System object, dec
= comm.RSDecoderdec
. This object
performs ReedSolomon (RS) decoding.
creates
an RS decoder object, dec
= comm.RSDecoder(N
,K
)dec
with the CodewordLength
property
set to N
and the MessageLength
property
set to K
.
creates
an RS decoder object, dec
= comm.RSDecoder(N
,K
,GP
)dec
with the CodewordLength
property
set to N
, the MessageLength
property
set to K
, and the GeneratorPolynomial
property
set to GP
.
creates
an RS decoder object, dec
= comm.RSDecoder(N
,K
,GP
,S
)dec
with the CodewordLength
property
set to N
, the MessageLength
property
set to K
, the GeneratorPolynomial
property
set to GP
, and the ShortMessageLength
property
set to S
.
creates
an RS decoder object, dec
= comm.RSDecoder(N
,K
,GP
,S
,Name
,Value
)dec
with the CodewordLength
property
set to N
, the MessageLength
property
set to K
, the GeneratorPolynomial
property
set to GP
, and each specified property Name
set
to the specified Value
.
creates
an RS decoder object, dec
= comm.RSDecoder(Name
,Value
)dec
, with each specified
property name set to the specified value. You can specify additional
namevalue pair arguments in any order as (Name1
,Value1
,...,NameN
,ValueN
).
Note:
The input and output signal lengths are listed in Input and Output Signal Lengths in BCH and RS System Objects on
the 

Assume that input is bits Specify whether the input comprises bits or integers. The default
is When you set this property to When you set this property to 

Codeword length Specify the codeword length of the RS code as a doubleprecision,
positive, integer scalar value. The default is For a fulllength RS code, the value of this property must be 2^{M}–1, where M is an integer such that 3$$\le $$M $$\le $$16. 

Message length Specify the message length as a doubleprecision positive integer
scalar value. The default is 

Short message length source Specify the source of the shortened message as When 

Shortened message length Specify the length of the shortened message as a doubleprecision
positive integer scalar whose value must be less than or equal to When 

Source of generator polynomial Specify the source of the generator polynomial as When you set this property to When you set this property to When you set this property to Property, you must specify
a generator polynomial using the 

Generator polynomial Specify the generator polynomial for the RS code as a doubleprecision
integer row vector or as a Galois field row vector whose entries are
in the range from 0 to 2^{M}–1
and represent a generator polynomial in descending order of powers.
The length of the generator polynomial must be The default is the result of When you use this object to generate code, you must set the generator polynomial to a doubleprecision integer row vector. 

Enable generator polynomial checking Set this property to For larger codes, disabling the check accelerates processing
time. As a best practice, perform the check at least once before setting
this property to 

Source of primitive polynomial Specify the source of the primitive polynomial as When you set this property to When you set 

Primitive polynomial Specify the primitive polynomial that defines the finite field 

Source of puncture pattern Specify the source of the puncture pattern as If you set this property to 

Puncture pattern vector Specify the pattern used to puncture the encoded data as a doubleprecision,
binary column vector of length ( 

Enable erasures input Set this property to The length of the erasures vector is explained in Input and Output Signal Lengths in BCH and RS System Objects. When this property is set to 

Enable number of corrected errors output Set this property to 

Data type of output Specify the output data type as 
clone  Create RS decoder object with same property values 
getNumInputs  Number of expected inputs to step method 
getNumOutputs  Number of outputs from step method 
isLocked  Locked status for input attributes and nontunable properties 
release  Allow property value and input characteristics changes 
step  Decode data using a ReedSolomon decoder 
This object implements the algorithm, inputs, and outputs described in Algorithms for BCH and RS Errorsonly Decoding.
comm.BCHDecoder
 comm.RSEncoder
 primpoly
 rsdec
 rsgenpoly