Index Modulation Based on Four-Dimensional Spherical Code and Its DNN-Based Receiver Design

A novel index modulation with spherical code and its constellation mapping are proposed. We derive the closed form of the approximation bound of the bit error rate (BER) of the OFDM-IM system based on four-dimensional spherical code. Our derived BER is very close to the simulation results. And different constellation mapping method have different BER performance and the gap is less than 0.2 dB. To reduce the detection complexity which is caused by the high-dimensional modulation, a DNN-based receiver with partial-connected layer is proposed. Simulation results show that our proposed DNN-based receiver can greatly reduce the complexity while its BER performance is close to the classical maximum likelihood detection method.

Automated summary

A novel index modulation approach using spherical code and its constellation mapping is proposed, with a closed form approximation bound of bit error rate derived. Different constellation mapping methods show slight differences in BER performance, and a DNN-based receiver is introduced to reduce detection complexity. Simulation results indicate that the proposed DNN-based receiver can greatly reduce complexity while maintaining close BER performance to the classical method.