GENERALIZATION OF ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WITH INDEX MODULATION

OFDM:

orthogonal frequency division multiplexing (OFDM) with index modulation (OFDM-IM) was proposed. By selecting a fixed number of sub carriers as active sub carriers to carry constellation symbols, the indices of these active sub carriers may carry additional bits of information 

Is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels.

 

 

 

 

                                         FIG: OFDM

 

 OFDM with generalized index modulation 1 (OFDMGIM1) and OFDM-GIM2, respectively. In OFDM-GIM1, the number of active sub carriers in an OFDM sub block is no longer fixed. Dependent on the input binary string, different number of active sub carriers are assigned to carry constellation symbols. In OFDM-GIM2, independent index modulation is performed on the in-phase and quadrature component per sub carrier.

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GENERALIZATION OF ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WITH INDEX MODULATION