this may be helpful:  

An effective go-back-N ARQ scheme for variable-error-rate channels

see: http://personal.stevens.edu/~yyao/paper-pdf/yao-ieee-tcom-1995.pdf

Here you have some indications for simulation of Stop and Wait ARQ. You will have to figure out the Go Back N and the Selective Retransmission cases, but it is an start: http://www.ece.ubc.ca/~teerawat/publications/NS2/14-NewModules.pdf

Take into account this too: http://www.ns2ultimate.com/post/1539258323/arq-module-program-update

Hello 

This two papers may be helpful to u check it out..

Check this pdf too.. 

Good PDF regarding to the data link layer protocol using GO BACK N and SELECTIVE technique. 

AFAIK. Selective retransmission is worth only if errors come in bursts, otherwise it makes no difference with respect to Go Back N, which has less overhead.

Thank you all ..I will start with that.