Zak-OTFS Based Coded Random Access for Uplink mMTC
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911081934356480 |
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| author | Mirri, Alessandro Khammammetti, Venkatesh Dabak, Beyza Paolini, Enrico Narayanan, Krishna Calderbank, Robert |
| author_facet | Mirri, Alessandro Khammammetti, Venkatesh Dabak, Beyza Paolini, Enrico Narayanan, Krishna Calderbank, Robert |
| contents | This paper proposes a grant-free coded random access (CRA) scheme for uplink massive machine-type communications (mMTC), based on Zak-orthogonal time frequency space (Zak-OTFS) modulation in the delay-Doppler domain. The scheme is tailored for doubly selective wireless channels, where conventional orthogonal frequency-division multiplexing (OFDM)-based CRA suffers from unreliable inter-slot channel prediction due to time-frequency variability. By exploiting the predictable nature of Zak-OTFS, the proposed approach enables accurate channel estimation across slots, facilitating reliable successive interference cancellation across user packet replicas. A fair comparison with an OFDM-based CRA baseline shows that the proposed scheme achieves significantly lower packet loss rates under high mobility and user density. Extensive simulations over the standardized Veh-A channel confirm the robustness and scalability of Zak-OTFS-based CRA, supporting its applicability to future mMTC deployments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_22013 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Zak-OTFS Based Coded Random Access for Uplink mMTC Mirri, Alessandro Khammammetti, Venkatesh Dabak, Beyza Paolini, Enrico Narayanan, Krishna Calderbank, Robert Signal Processing This paper proposes a grant-free coded random access (CRA) scheme for uplink massive machine-type communications (mMTC), based on Zak-orthogonal time frequency space (Zak-OTFS) modulation in the delay-Doppler domain. The scheme is tailored for doubly selective wireless channels, where conventional orthogonal frequency-division multiplexing (OFDM)-based CRA suffers from unreliable inter-slot channel prediction due to time-frequency variability. By exploiting the predictable nature of Zak-OTFS, the proposed approach enables accurate channel estimation across slots, facilitating reliable successive interference cancellation across user packet replicas. A fair comparison with an OFDM-based CRA baseline shows that the proposed scheme achieves significantly lower packet loss rates under high mobility and user density. Extensive simulations over the standardized Veh-A channel confirm the robustness and scalability of Zak-OTFS-based CRA, supporting its applicability to future mMTC deployments. |
| title | Zak-OTFS Based Coded Random Access for Uplink mMTC |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2507.22013 |