Hello: I had a query regarding the encoder transmission format order at the Reed-Solomon encoder output for the commercial standards such as European DVB, North American ATSC/ITU-J83 standards etc. For a RS (n,k) code, if the message polynomial is : m(x)=m(0)+m(1)*x+m(2)*x^2+......+m(k-1)*x^(k-1) and the parity polynomial is : c(x)=c(0)+c(1)*x+...........+c(n-k-1)*x^(n-k-1). Is the reed-solomon encoder format output by these standards given as: r=[m(0) m(1) .....m(k-1) c(0) c(1) .....c(n-k-1)] or r=[m(k-1) m(k-2) ......m(0) c(n-k-1) ....c(1) c(0)] ???? This is very important since the decoder needs to be aware of the format of the transmission at the encoder side.. Any help would be greatly appreciated. Vikram
Order of encoder output in Reed-Solomon encoding
Started by ●March 8, 2005
Reply by ●October 3, 20052005-10-03
>Hello: >I had a query regarding the encoder transmission format order at the >Reed-Solomon encoder output for the commercial standards such as >European DVB, North American ATSC/ITU-J83 standards etc. > >For a RS (n,k) code, if the message polynomial is : >m(x)=m(0)+m(1)*x+m(2)*x^2+......+m(k-1)*x^(k-1) >and the parity polynomial is : >c(x)=c(0)+c(1)*x+...........+c(n-k-1)*x^(n-k-1). > >Is the reed-solomon encoder format output by these standards given as: > >r=[m(0) m(1) .....m(k-1) c(0) c(1) .....c(n-k-1)] > >or > >r=[m(k-1) m(k-2) ......m(0) c(n-k-1) ....c(1) c(0)] ???? > >This is very important since the decoder needs to be aware of the >format of the transmission at the encoder side.. > >Any help would be greatly appreciated. > >Vikram > >Hi Vikram, Co-efficient of highest order X is the first to ENTER the encoder, first to LEAVE the encoder. It is also the FIRST to enter the decoder and exit the decoder... ! Rider This message was sent using the Comp.DSP web interface on www.DSPRelated.com