Constellation-Based Index Modulation: A Permutational Approach

In this chapter, we implement constellation-based index modulation for orthogonal frequency division multiplexing (OFDM) systems via a permutational approach. First, we propose the multiple-mode OFDM with index modulation (MM-OFDM-IM) scheme and extend the principle to the in-phase (I-) and quadrature (Q-) components of OFDM signals. Then, we propose the scheme of generalized (G-)MM-OFDM-IM, which allows a different subcarrier to utilize a signal constellation of a different size while conveying the same number of index bits. Finally, two transmit diversity schemes are designed for MM-OFDM-IM(-IQ).