Research Journal of Information Technology1815-74322151-7959Science International10.3923/rjit.2014.58.64RugumiraGeorgia 1201461Sub-optimal modulation scheme was proposed to reduce the Bit Error Rate (BER) in Vector Orthogonal Frequency Division Multiplexing (VOFDM). Suboptimal modulation scheme is connected with the minimum Euclidean distance of all possible received vector symbols. VOFDM using the suboptimal modulation has shown an improvement on eliminating channel spectral nulls. However, it has a high Peak to Average Power Ratio (PAPR) of the transmitted signal which may increase the complexity of the system. This paper introduces the carrier interferometry technique in suboptimal modulation-VOFDM to reduce the PAPR and improve the BER performance. The simulation results of the proposed system show about 10dB PAPR reduction compared to the conventional VOFDM system.]]>Xia, X.G.,20014913631374Huang, X.L., G. Wang and F. Hu,201024553567Han, S.H. and J.H. Lee,2005125665Wu, Z. and C.R. Nassar,2005414911505Natarajan, B., C.R. Nassar, S. Shattil, M. Michelini and Z. Wu,20015013441353Rugumira, G., G. Wang, X.L. Huang, L.T.D. Nguyen and J.R Li,20112011pp: 456461Zhang, H., X.G. Xia and L.J. Cimini,2005424542464Goeckel, L.D. and G. Ananthaswamy,200250442452