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Enhancing communication performance with DFT-S-OFDM and multi-dimensional index modulation
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DOI：10.1016/j.phycom.2026.103027.png)
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Abstract
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The Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) system provides low Peak Average Power Ratio (PAPR) and low complexity. However, the current mode of subcarrier mapping in the system leads to a waste of subcarriers, thereby reducing the transmission rate. In this paper, a DFT-S-OFDM with Multi-Dimensional Index (DFT-S-OFDM-MDI) modulation system is proposed. The MDI incorporates subcarrier index (SI) and constellation diagram index (CDI), enabling the transmission of bit information in diverse index modes, thereby enhancing the system's transmission efficiency. We have configured six constellation diagram schemes for the system and incorporated spreading matrices to significantly boost the Bit Error Rate (BER) performance. The simulation results indicate that the proposed system is superior to traditional methods in terms of Spectral Efficiency (SE), Energy Efficiency (EE), and Bit Error Rate (BER).
Keywords:
Index modulation
Constellation diagram
Spreading Matrix
DFT-S-OFDM
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