RE: [ecc] reed solomon

[Robert Morelos-Zaragoza <owner@eccpage.com>]

Hello Damian,


> > 1. when you perform [1 + S(x)]L(x), this will give you a polynomial
> 
> > of 
> > degree 2t^2, when you do mod^(2t + 1), is this just a matter of 
> > eliminating 
> > all polynomials with coefficients greater than or equal to (2t + 
> > 1)? 

Correct.

> > 2. what is the significance of the negative sign in computing the 
> > magnitude 
> > using the formula : 
> > 	e = -Xk Omega 
> > 	    Lambda prime 

Please note that over the Galois field GF(2^m), the negative sign and
the positive sign have the same "meaning". This is because the
characteristic is 2 and therefore a + a = 0, from which it follows that
a = -a.

In other words, ignore the negative sign when working with fields of
characteristic 2, such as GF(2^m).

Regards and have fun,

Robert

--
To unsubscribe from ecc mailing list please visit http://www.opencores.org/mailinglists.shtml