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A hybrid autoencoder and index modulation framework for OTFS modulation

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Abstract

This paper presents an innovative approach to orthogonal time frequency space (OTFS) modulation by integrating autoencoder-based enhanced (AEE) joint delay-Doppler index modulation (JDDIM) techniques. The proposed AEE-JDDIM-OTFS framework leverages deep learning to optimize the mapping and demapping processes, significantly improving spectral and energy efficiency in high-mobility communication scenarios. The system’s performance is further enhanced by the introduction of a low-complexity greedy detector that maintains robust detection accuracy, even under imperfect channel state information (CSI) conditions. Extensive simulation results demonstrate that the proposed scheme achieves superior bit error rate (BER) performance compared to conventional OTFS and other OTFS-based modulation schemes, even in imperfect channel state information situations. The findings suggest that the AEE-JDDIM-OTFS framework offers a practical, low-complexity solution with promising potential for next-generation wireless communication systems.

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No datasets were generated or analysed during the current study.

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Funding

This work is supported by TUBITAK under Grant Number 121C254.

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Contributions

All authors contributed to the study conception and design. System model design and simulations were performed by Yusuf İslam Tek, Ali Tuğberk Doğukan, Yarkın Gevez, and Mehmet Ertuğ Pıhtılı. The first draft of the manuscript was written by these authors. This work was supervised by Ertuğrul Başar. All authors read and approved the final manuscript.

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Correspondence to Yusuf İslam Tek.

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This paper is an extended version of our paper published in 2024 32nd Signal Processing and Communications Applications Conference (SIU 2024) [23].

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Tek, Y.İ., Doğukan, A.T., Gevez, Y. et al. A hybrid autoencoder and index modulation framework for OTFS modulation. SIViP 19, 13 (2025). https://doi.org/10.1007/s11760-024-03688-y

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  • DOI: https://doi.org/10.1007/s11760-024-03688-y

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