So you are telling me that my problem can't be solved. I confirm that Matlab has this limitation too.
I have to work with codewords whose length is less than 2^16, so at the beginning I thought that I could use them with the functions but I were wrong. The codes I'm trying to obtain are shortened versions of "mother" codes whose length is ~ 2^18 and 2^20. So I can encode them (not using "mother" n,k value but the shortened one) with a suitable generator polynomial but I can't decode them since if I try to use a primitive of grade 18 (or 20) i receive that error. If I try any of the primitive of grade 16 (as I said the codewords have lrngth < 16) I can't correct any error... Hope to have explained well my situation..Is there any possibile solution? And last question: what's the meaning of creating primitive polyonomials of grade <= 22 (the limitation of primpoly) if I can't use a primitive polynomial of grade > 16 for a galois field limit hard coded? Thanks Marco Il giorno Sat, 29 Nov 2008 22:22:07 +0100 [EMAIL PROTECTED] ha scritto: > On Sat, Nov 29, 2008 at 09:28:50PM +0100, Marco Maso wrote: > > I'm currently working with BCH codes yet, since September, and after > > having solved my initial problems I receive a new error if i try to > > encode a word of length ~ 2^18 I receive: > > > > error: invalid order 18 for Galois Field > > > > To give evidence of the fact I can post an example: > > The galois field code is hard coded not to allow anything above > GF(2^16). Some the tables and code becomes pretty slow after that. I > believe Matlab has the same limitation, or at least it didn't when I > wrote this stuff. > > D. -- Per favore non mandatemi allegati in Word o PowerPoint. Si veda http://www.gnu.org/philosophy/no-word-attachments.html
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