Multi-carrier modulation technology can improve spectrum efficiency in limited spectrum resources by modulating data to low speed parallel multiple subcarriers, and can provide reliable data transmission in an effective frequency band. As a member of multicarrier modulation, orthogonal Frequency Division Multiplexing (OFDM) can resist certain channel fading, but it has the disadvantages of low energy efficiency and spectral efficiency, sensitive to carrier frequency offset and high out-of-band radiation. In order to solve this problem, scholars have further explored in the field of multicarrier modulation, and proposed OFDM technology based on index modulation (OFDM-IM) and filter bank multicarrier technology (FBMC). Compared with OFDM, although the complexity of OFDM-IM and FBMC is improved, OFDM-IM has higher energy efficiency. The on-demand adjustment between system bit error rate (BER) performance and spectral efficiency can be realized by configuring the number of active subcarriers in each subcarrier group. FBMC has higher spectral efficiency, can resist a certain carrier frequency offset, and the out-of-band attenuation is greatly reduced. Therefore, the research on OFDM-IM has very important theoretical significance and application value.
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