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Description
I think that you are committing a mistake. 'n' is the length of final message with parity code. 'k' is the lenght of message (number of symbols). To encode a message using a Reed-Solomon code: Create the comm.HDLRSEncoder object and set its properties. Call the object with arguments, as if it were a function.
code = rsenc(msg,n,k)
encodesthe message in msg
using an [n
,k
]Reed-Solomon code with the narrow-sense generator polynomial. msg
isa Galoisarray of symbols having m bits each. Each k
-elementrow of msg
represents a message word, where theleftmost symbol is the most significant symbol. n
isat most 2m-1. If n
isnot exactly 2m-1, rsenc
usesa shortened Reed-Solomon code. Iku download for mac. Parity symbols are at the end of eachword in the output Galois array code
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code = rsenc(msg,n,k,genpoly)
isthe same as the syntax above, except that a nonempty value of genpoly
specifiesthe generator polynomial for the code. In this case, genpoly
isa Galois row vector that lists the coefficients, in order of descendingpowers, of the generator polynomial. The generator polynomial musthave degree n-k
. To use the default narrow-sensegenerator polynomial, set genpoly
to []
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code = rsenc(..,paritypos
)
specifies whether rsenc
appends or prepends the parity symbols to the input message to form code
. paritypos
can be either 'end'
or 'beginning'
. The default is 'end'
.Description
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decoded = rsdec(code,n,k)
attemptsto decode the received signal in code
using an[n
,k
] Reed-Solomon decodingprocess with the narrow-sense generator polynomial. code
isa Galoisarray of symbols having m bits each. Each n
-elementrow of code
represents a corrupted systematic codeword,where the parity symbols are at the end and the leftmost symbol isthe most significant symbol. n
is at most 2m-1.If n
is not exactly 2m-1, rsdec
assumesthat code
is a corrupted version of a shortenedcode.Matlab Download Free
In the Galois array
decoded
, each row representsthe attempt at decoding the corresponding row in code
.A decoding failure occurs if rsdec
detectsmore than (n-k)/2
errors in a row of code
.In this case, rsdec
forms the corresponding rowof decoded
by merely removing n-k
symbolsfrom the end of the row of code
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decoded = rsdec(code,n,k,genpoly)
isthe same as the syntax above, except that a nonempty value of genpoly
specifiesthe generator polynomial for the code. In this case, genpoly
isa Galois row vector that lists the coefficients, in order of descendingpowers, of the generator polynomial. The generator polynomial musthave degree n-k
. To use the default narrow-sensegenerator polynomial, set genpoly
to []
.decoded = rsdec(..,paritypos
)
specifies whether the parity symbols in code
were appended or prepended to the message in the coding operation. Onlyoffice github. paritypos
can be either 'end'
or 'beginning'
. The default is 'end'
. If paritypos
is 'beginning'
, a decoding failure causes rsdec
to remove n-k
symbols from the beginning rather than the end of the row.[decoded,cnumerr] = rsdec(..)
returnsa column vector cnumerr
, each element of whichis the number of corrected errors in the corresponding row of code
.A value of -1
in cnumerr
indicatesa decoding failure in that row in code
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[decoded,cnumerr,ccode] = rsdec(..)
returns ccode
,the corrected version of code
. The Galois array ccode
hasthe same format as code
. If a decoding failureoccurs in a certain row of code
, the correspondingrow in ccode
contains that row unchanged.