Hiiiii, I am Jitendra,Comm.Engg. making Reed-Solomon Codec using specs of ITU-J.83 Annex-B. Specs are : n=128,k=122, under GF(128), 7-bit symbol, Generator Polynomial : G(x)=(x+alpha^1)(x+alpha^2)(x+alpha^3)(x+alpha^4)(x+alpha^5); As per the standard I come up with a encoder, But I didnt have any reference to verify/check my codeword. In matlab, RS functions are taking n and k parameters such that n-k differece must be +ve even integer. Here while encoding, we have to set n=127.and that's is max value for n under GF(128) for 7-bit symbol. After Generating 127 symbols CW, 128th symbol is generated by evaluating CW on 6th power alpha. Decoder side, I calculated 5 syndromes by evaluating 127-symbol CW at alpha,...alpha^5 and 6th syndromes by evaluating 128-symbol CW at alpha^6. But I am not able to decode it. If you have any usefull information on this let me know. Thanks, Jitendra. jitendra.sn@gmail.com jitendra_nalawade@yahoo.co.in

# Reed-Solomon Coding under ITU-J.83 Annex-B

Started by ●October 1, 2007