Abstract
In this paper we study almost p-ary sequences and their autocorrelation coefficients. We first study the number ℓ of distinct out-of-phase autocorrelation coefficients for an almost p-ary sequence of period n + s with s consecutive zero-symbols. We prove an upper bound and a lower bound on ℓ. It is shown that ℓ can not be less than \(\min \limits \{s,p,n\}\). In particular, it is shown that a nearly perfect sequence with at least two consecutive zero symbols does not exist. Next we define a new difference set, partial direct product difference set (PDPDS), and we prove the connection between an almost p-ary nearly perfect sequence of type (γ1, γ2) and period n + 2 with two consecutive zero-symbols and a cyclic \((n+2,p,n,\frac {n-\gamma _{2} - 2}{p}+\gamma _{2},0,\frac {n-\gamma _{1} -1}{p}+\gamma _{1},\frac {n-\gamma _{2} - 2}{p},\frac {n-\gamma _{1} -1}{p})\) PDPDS for arbitrary integers γ1 and γ2. Then we prove a necessary condition on γ2 for the existence of such sequences. In particular, we show that they do not exist for γ2 ≤ − 3.
Similar content being viewed by others
References
Beth, T., Jungnickel, D., Lenz, H.: Design theory:. No. 1. c. In: Encyclopedia of Mathematics and its Applications. Cambridge University Press (1999)
Chee, Y.M., Tan, Y., Zhou, Y.: Almost p-ary perfect sequences. In: International Conference on Sequences and Their Applications, pp 399–415. Springer (2010)
Golomb, S.W., Gong, G.: Signal Design for Good Correlation: for Wireless Communication, Cryptography, and Radar. Cambridge University Press (2005)
Jungnickel, D., Pott, A.: Perfect and almost perfect sequences. Discret. Appl. Math. 95(1–3), 331–359 (1999)
Lam, T.Y., Leung, K.H.: On vanishing sums of roots of unity. J. Algebra 224 (1), 91–109 (2000)
Liu, H.Y., Feng, K.Q.: New results on nonexistence of perfect p-ary sequences and almost p-ary sequences. Acta Mathematica Sinica English Series 32(1), 2–10 (2016)
Lv, C.: On the non-existence of certain classes of perfect p-ary sequences and perfect almost p-ary sequences. IEEE Trans. Inf. Theory 63(8), 5350–5359 (2017)
Ma, S.L., Ng, W.S.: On non-existence of perfect and nearly perfect sequences. Int. J. Inform. Coding Theory 1(1), 15–38 (2009)
Niu, X., Cao, H., Feng, K.: Non-existence of perfect binary sequences. arXiv:1804.03808 (2018)
Özbudak, F,, Yayla, O,, Yıldırım, C,C,: Nonexistence of certain almost p-ary perfect sequences. In: International Conference on Sequences and Their Applications, pp 13–24. Springer (2012)
Winterhof, A., Yayla, O., Ziegler, V.: Non-existence of some nearly perfect sequences, near butson-hadamard matrices, and near conference matrices. Mathematics in Computer Science to appear (2018)
Yayla, O.: Nearly perfect sequences with arbitrary out-of-phase autocorrelation. Adv. Math. Commun. 10(2), 401–411 (2016)
Acknowledgements
We would like to thank anonymous reviewers for the detailed and diligently prepared suggestions, which improved the paper. We would also like to thank Alexander Pott for constructive criticism of the manuscript. The authors are supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under Project No: 116R026.
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher’s note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Özden, B., Yayla, O. Almost p-ary sequences. Cryptogr. Commun. 12, 1057–1069 (2020). https://doi.org/10.1007/s12095-020-00423-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12095-020-00423-5