Journal of Applied Sciences1812-56541812-5662orgz10.3923/jas.2010.3175.3182TufaLemma D.RamasamyM.ShuhaimiM.1220101024Closed-loop identification scheme using OBF-ARMAX model structure is presented. The proposed structure can be used to identify both open-loop stable and open-loop unstable processes that are stabilized by a feedback controller. The algorithm for estimating the model parameters and the formula for the multi-step ahead prediction are derived. The proposed identification scheme is demonstrated using two simulation case studies: One for open-loop stable and another for open-loop unstable. Both case studies demonstrate that the proposed scheme can be effectively used for closed-loop identification of both open-loop stable and open-loop unstable systems that are stabilized by a feedback control system.]]>Van den Hof, P.M.J., P.S.C. Heuberger and B. Wahlberg,2005Heuberger, P.S.C., P.M.J. Van de Hof and O.H. Bosgra,1995Ninness, B.M. and F. Gustafsson,1997Patwardhan, S.C. and S.L. Shah,2005Nelles, O.,2001Ljung, L.,1999Gilson, M. and P.M.J. van den Hof,2005Gaspar, P., Z. Szabo and J. Bokor, 1999Ananth, I. and M. Chidambaram,1999Lemma, D.T., M. Ramasamy, S.C. Patwardhan and M. Shuhaimi,2010Lemma, D.T., M. Ramasamy and M. Shuhaimi,2009