Random Spreading With Higher Order Modulation in Unsourced Random Access
Unsourced random access (URA) is crucial for future massive access scenarios. Existing URA schemes often use low-order modulation and assess performance with a limited number of active users. This work presents a pilot-free URA scheme that employs random spreading and higher-order modulation. We der...
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| Published in: | IEEE communications letters Vol. 29; no. 4; pp. 829 - 833 |
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IEEE
01.04.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1089-7798, 1558-2558 |
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| Abstract | Unsourced random access (URA) is crucial for future massive access scenarios. Existing URA schemes often use low-order modulation and assess performance with a limited number of active users. This work presents a pilot-free URA scheme that employs random spreading and higher-order modulation. We derive a discrete mixture generalized approximate message passing algorithm to enhance active user detection (AUD) and data detection. Simulations show that our proposed method significantly outperforms pilot-based methods in AUD, and higher-order modulation supports a large number of active users while ensuring the target per user probability of error (PUPE) performance. |
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| AbstractList | Unsourced random access (URA) is crucial for future massive access scenarios. Existing URA schemes often use low-order modulation and assess performance with a limited number of active users. This work presents a pilot-free URA scheme that employs random spreading and higher-order modulation. We derive a discrete mixture generalized approximate message passing algorithm to enhance active user detection (AUD) and data detection. Simulations show that our proposed method significantly outperforms pilot-based methods in AUD, and higher-order modulation supports a large number of active users while ensuring the target per user probability of error (PUPE) performance. |
| Author | Dang, Jian Wu, Yongpeng Zhang, Zaichen |
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| SubjectTerms | active user detection Adaptation models Algorithms Approximation algorithms Decoding Indexes Mathematical models Message passing Modulation multiple access Random access random spreading Symbols Unsourced random access Vectors |
| Title | Random Spreading With Higher Order Modulation in Unsourced Random Access |
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