Abstract
A Barker sequence is a sequence with elements ±1 such that all out-of-phase aperiodic autocorrelation coefficients are 0, 1 or -1. It is known that if a Barker sequence of length s > 13 exists then s = 4N 2 for some odd integer N ≥ 55, and it has long been conjectured that no such sequence exists. We review some previous attempts to improve the bound on N which, unfortunately, contain errors. We show that a recent theorem of Eliahou et al. [5] rules out all but six values of N less than 5000, the smallest of which is 689.
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Communicated by D. Jungnickel
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Jedwab, J., Lloyd, S. A note on the nonexistence of Barker sequences. Des Codes Crypt 2, 93–97 (1992). https://doi.org/10.1007/BF00124212
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DOI: https://doi.org/10.1007/BF00124212