Abstract
Arrays with low autocorrelation are widely sought in applications; important examples are arrays whose periodic autocorrelation is zero for all nontrivial cyclic shifts, so-called perfect arrays. In 2001, Arasu and de Launey defined almost perfect arrays: these have size 2u×v and autocorrelation arrays with only two nonzero entries, namely 2uv and −2uv in positions (0,0) and (u,0), respectively. In this paper we present a new class of arrays with low autocorrelation: for an integer n≥1, we call an array n-perfect if it has size nu×v and if its autocorrelation array has only n nonzero entries, namely nuvλi in position (iu,0) for i=0,1,…,n−1, where λ is a primitive n-th root of unity. Thus, an array is 1-perfect (2-perfect) if and only if it is (almost) perfect. We give examples and describe a recursive construction of families of n-perfect arrays of increasing size.
Original language | English |
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Pages (from-to) | 737-748 |
Number of pages | 12 |
Journal | Cryptography and Communications: discrete structures, Boolean functions and sequences |
Volume | 9 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Nov 2017 |
Keywords
- Almost perfect arrays
- n-perfect arrays
- Periodic autocorrelation
- Recursive constructions