OTFS-IDMA: An Unsourced Multiple Access Scheme for Doubly-Dispersive Channels
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866917210293796864 |
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| author | Bergamasco, Davide Clazzer, Federico Casari, Paolo |
| author_facet | Bergamasco, Davide Clazzer, Federico Casari, Paolo |
| contents | We present an unsourced multiple access (UMAC) scheme tailored to high-mobility wireless channels. The proposed construction is based on orthogonal time frequency space (OTFS) modulation and sparse interleaver division multiple access (IDMA) in the delay-Doppler (DD) domain. The receiver runs a compressive-sensing joint activity-detection and channel estimation process followed by a single-user decoder which harnesses multipath diversity via the maximal-ratio combining (MRC) principle. Numerical results show the potential of DD-based uncoordinated schemes in the presence of double selectivity, while remarking the design tradeoffs and remaining challenges introduced by the proposed design. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_13065 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | OTFS-IDMA: An Unsourced Multiple Access Scheme for Doubly-Dispersive Channels Bergamasco, Davide Clazzer, Federico Casari, Paolo Signal Processing We present an unsourced multiple access (UMAC) scheme tailored to high-mobility wireless channels. The proposed construction is based on orthogonal time frequency space (OTFS) modulation and sparse interleaver division multiple access (IDMA) in the delay-Doppler (DD) domain. The receiver runs a compressive-sensing joint activity-detection and channel estimation process followed by a single-user decoder which harnesses multipath diversity via the maximal-ratio combining (MRC) principle. Numerical results show the potential of DD-based uncoordinated schemes in the presence of double selectivity, while remarking the design tradeoffs and remaining challenges introduced by the proposed design. |
| title | OTFS-IDMA: An Unsourced Multiple Access Scheme for Doubly-Dispersive Channels |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2601.13065 |