Abstract
It is an old conjecture that there are no unknown Barker sequences. Here, a sufficient condition for the non-existence of Barker sequences of even length 4m 2 is given, which allows us to show that there are no unknown sequences withm less than 105, exceptm=63, which remains still undecided.
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References
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Elia, M. On the non-existence of barker sequences. Combinatorica 6, 275–278 (1986). https://doi.org/10.1007/BF02579388
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DOI: https://doi.org/10.1007/BF02579388