Fully Asynchronous Unsourced Random Access over Fading Channels
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915690959601664 |
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| author | Ozates, Mert Kazemi, Mohammad Liva, Gianluigi Gündüz, Deniz |
| author_facet | Ozates, Mert Kazemi, Mohammad Liva, Gianluigi Gündüz, Deniz |
| contents | We examine unsourced random access in a fully asynchronous setup, where active users transmit their data without restriction on the start time over a fading channel. In the proposed scheme, the transmitted signal consists of a pilot sequence and a polar codeword, with the polar codeword distributed across the data part of the packet in an on-off pattern. The receiver uses a double sliding-window decoder, where the inner window employs iterative decoding with joint timing and pilot detection, channel estimation, single-user decoding, and successive interference cancellation to recover the message bits, while the outer window enhances interference cancellation. The numerical results indicate that the proposed scheme exhibits only a slight performance loss compared to the synchronous benchmark while being more applicable in practice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_19468 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fully Asynchronous Unsourced Random Access over Fading Channels Ozates, Mert Kazemi, Mohammad Liva, Gianluigi Gündüz, Deniz Information Theory Signal Processing We examine unsourced random access in a fully asynchronous setup, where active users transmit their data without restriction on the start time over a fading channel. In the proposed scheme, the transmitted signal consists of a pilot sequence and a polar codeword, with the polar codeword distributed across the data part of the packet in an on-off pattern. The receiver uses a double sliding-window decoder, where the inner window employs iterative decoding with joint timing and pilot detection, channel estimation, single-user decoding, and successive interference cancellation to recover the message bits, while the outer window enhances interference cancellation. The numerical results indicate that the proposed scheme exhibits only a slight performance loss compared to the synchronous benchmark while being more applicable in practice. |
| title | Fully Asynchronous Unsourced Random Access over Fading Channels |
| topic | Information Theory Signal Processing |
| url | https://arxiv.org/abs/2512.19468 |