Hi everybody, my name is Marco and this is my first message to the ML. I've decided to subscribe because i have a little problem usign the bchenco function provided with the communications toolbox of octave-forge (versio 1.0.6). I'm currently using Octave 3.0.2. As i can read on the Function Reference page this function:
"Encodes the message msg using a [n,k] BCH coding. The variable msg is a binary array with k columns and an arbitrary number of rows. Each row of msg represents a single symbol to be coded by the BCH coder. The coded message is returned in the binary array code containing n columns and the same number of rows as msg." And after: "By default the generator polynomial used in the BCH coding is based on the properties of the Galois Field GF(2^m). This default generator polynomial can be overridden by a polynomial in g. Suitable generator polynomials can be constructed with bchpoly." I'm developing a software that needs a BCH encoder with the following parameters (among the others...): - BCH uncoded word length = Kbch = 32208 - BCH coded word length = Nbch = 32400 - BCH uncoded word length = Kbch = 7302 - BCH coded word length = Nbch = 7200 In the first case i use a g polynomial obtained by multiplying 12 polynomials of grade 16. This polynomial generator works correctly with the other 5 couples (n,k) i need to test on my simulator. In the second case In the first case i use a g polynomial obtained by multiplying 12 polynomials of grade 14. This polynomial generator works correctly with the other 6 couples (n,k) i need to test on my simulator. Obviously thes are not numbers invented by myself but i'm using a manual as a reference so i'm sure they are correct. In both cases i obtain this error: error: bchenco: can not find valid generator polynomial for parameters error: evaluating assignment expression near line 140, column 3 I can't properly understand where the problem can be even because i can't find the source code of this function... Can anybody explain me why i receive such an error? Should i post the coefficients of my g polynomial? Last question (stupid) : when working with octave a polynomial insertion has always to be done from LSB to MSB am i right? Thanks a lot Marco -- Per favore non mandatemi allegati in Word o PowerPoint. Si veda http://www.gnu.org/philosophy/no-word-attachments.html
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