Hi All, I want to use the Reed Solomon (255,247) codedec from : http://www.humanistic.org/~hendrik/reed-solomon/index.html My question is about the polynomial generator that is used to build the encoder of RS (255,247) codec. as the literature says, g(x) is calculated like this : g(x) = (x- a^b)(x- a^(b +1))(x- a^(b+2)).........(x- a^(b+2t-1 )) b= 1 : for narrow-sens RS codes, but in this codec there is no way to know the value of "b". which value can we choose for (255,247) codedec? also: for calculating the syndrome we have Sj= r(a^i). Which "i" to choose? the same b+2*j-1 (j=0..t) used to calculate g(x)? Best regards.

# Reed solomon question

Started by ●August 7, 2006

Reply by ●August 8, 20062006-08-08

> which value can we choose for (255,247) codedec?Choose any integer for 'b' ... though, usually there is a smartest choice. For example, a smart 'b' would reduce the hardware implementation.> for calculating the syndrome we have Sj= r(a^i). Which "i" to choose? > the same b+2*j-1 (j=0..t) used to calculate g(x)?You must evaluate the received polynomial at the same roots of the generator polynomial. cw