A Multi-mode OFDM System with Coded Direct Index Modulation (MM-OFDM-CDIM)

Orthogonal frequency division multiplexing (OFDM) has various advantages and is used in many kinds of communication services. However, the next generation mobile communication systems will require higher performance and efficiency. The more advanced OFDM have been actively considered to meet such requirements. In this paper, we like to propose a multi-mode OFDM system with coded direct index modulation (MM-OFDM-CDIM) that can improve both performance and efficiency than the conventional OFDM system. The proposed MM-OFDM-CDIM system maps symbols into subcarriers and transmits the symbols, and it also maps data to indexes of subcarriers directly and transmits the data. At first, transmission and reception processes of the proposed system are described. Then, in order to verify the superiority of the proposed MM-OFDM-CDIM system, the bit error rate (BER) performance of the proposed system is compared with the conventional OFDM system in the additive white Gaussian noise and Rayleigh fading channel. As simulation results, it is confirmed that MM-OFDM-CDIM system can improve both BER performance and efficiency, compared to conventional OFDM system.