Please send codings to generat Third Harmonic Injection PWM (THIPWM) signal.
Please any help?
What "help", exactly, do you want?
Sounds like you want someone to do the job for you?
If so, see: http://www.keil.com/condb/search.asp
although you're still going to have to put some work in to be able to give a proper requirement against which someone could quote...