PERFORMANCE OF SUB CARRIER INDEX MODULATION IN OFDM

Abstract

Orthogonal Frequency Division Multiplexing with sub-carrier Index modulation (OFDM-SIM) is a recently developed scheme which has certain advantages over the existing OFDM scheme. In this scheme information is sent not only through the sub-carriers but also through their indices. The performance of OFDM-SIM has been analyzed in comparison to classical OFDM. The energy efficiency of this technique is always more than OFDM because all subcarriers are not active. The Bit Error Rate of OFDM-SIM is less than OFDM for the same spectral efficiency at high signal to noise ratio values. Also there is an enhancement in spectral efficiency for lower order of modulation and certain sub-carrier activation ratio. Simulation results show the superiority of the OFDM-SIM over OFDM