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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.04928 |
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| _version_ | 1866912313174392832 |
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| author | Hu, Tianyang Luo, Qu Xiao, Lixia Zhou, Jiaxi Xiao, Pei Jiang, Tao |
| author_facet | Hu, Tianyang Luo, Qu Xiao, Lixia Zhou, Jiaxi Xiao, Pei Jiang, Tao |
| contents | In this letter, a novel class of sparse codebooks is proposed for sparse code multiple access (SCMA) aided non-terrestrial networks (NTN) with randomly distributed users characterized by Rician fading channels. Specifically, we first exploit the upper bound of bit error probability (BEP) of an SCMA-aided NTN with large-scale fading of different users under Rician fading channels. Then, the codebook is designed by employing pulse-amplitude modulation constellation, user-specific rotation and power factors. To further reduce the optimization complexity while maintaining the power diversity of different users, an orthogonal layer-assisted joint layer and power assignment strategy is proposed. Finally, unlike existing SCMA codebook designs that treat all users as one super-user, we propose to minimize the BEP of the worst user to ensure user fairness. The simulation results show that the proposed scheme is capable of providing a substantial performance gain over conventional codebooks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04928 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Advanced Codebook Design for SCMA-aided NTNs With Randomly Distributed Users Hu, Tianyang Luo, Qu Xiao, Lixia Zhou, Jiaxi Xiao, Pei Jiang, Tao Signal Processing In this letter, a novel class of sparse codebooks is proposed for sparse code multiple access (SCMA) aided non-terrestrial networks (NTN) with randomly distributed users characterized by Rician fading channels. Specifically, we first exploit the upper bound of bit error probability (BEP) of an SCMA-aided NTN with large-scale fading of different users under Rician fading channels. Then, the codebook is designed by employing pulse-amplitude modulation constellation, user-specific rotation and power factors. To further reduce the optimization complexity while maintaining the power diversity of different users, an orthogonal layer-assisted joint layer and power assignment strategy is proposed. Finally, unlike existing SCMA codebook designs that treat all users as one super-user, we propose to minimize the BEP of the worst user to ensure user fairness. The simulation results show that the proposed scheme is capable of providing a substantial performance gain over conventional codebooks. |
| title | Advanced Codebook Design for SCMA-aided NTNs With Randomly Distributed Users |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2504.04928 |