Abstract
Codebooks with small maximum cross-correlation amplitudes are used to distinguish the signals from different users in multiple access communication systems in code division. Firstly, this paper studies the Jacobi sums over Galois rings of arbitrary characteristics and completely determines their absolute values. This extends the work by Li et al. (Sci China 56(7):1457–1465, 2013), where the Jacobi sums over some Galois rings with characteristics of a prime square were discussed. It is worth mentioning that the generalization is not trivial, as the Galois rings of arbitrary characteristics have a more complicated structure. Our deterministic construction of codebooks is based on Jacobi sums over Galois rings of arbitrary characteristics, producing asymptotically optimal codebooks for the Welch bound. Finally, compared to the literature, this article proposes for the first time design of codebooks based on Jacobi sums over Galois rings. In addition, the parameters of the presented codebooks are new.
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Acknowledgements
The authors thank the Associated Editor and anonymous reviewers for their valuable comments that improved the presentation and quality of this paper. G. Wang and Y. Gao are supported by the Scientific Research Project of Tianjin Education Commission (No. 2022KJ075), the Fundamental Research Funds for the Central Universities of China (No. 3122023QD25) and the Open Foundation of Tianjin Key Laboratory of Advanced Signal Processing (No. 2022ASP-TJ02). The French Agence Nationale de la Recherche partially supported the third author’s work through ANR BARRACUDA (ANR-21-CE39-0009). F.-W Fu is supported by the National Key Research and Development Program of China (Grant No. 2018YFA0704703), the National Natural Science Foundation of China (Grant No. 61971243), the Natural Science Foundation of Tianjin (20JCZDJC00610), the Fundamental Research Funds for the Central Universities of China (Nankai University), and the Nankai Zhide Foundation.
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Xu, DM., Wang, G., Mesnager, S. et al. Jacobi sums over Galois rings of arbitrary characters and their applications in constructing asymptotically optimal codebooks. Des. Codes Cryptogr. 92, 1051–1073 (2024). https://doi.org/10.1007/s10623-023-01328-z
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DOI: https://doi.org/10.1007/s10623-023-01328-z
Keywords
- Galois ring
- Additive character
- Multiplicative character
- Gauss sum
- Jacobi sum
- Codebook
- Maximal cross-correlation amplitude
- Welch bound