Abstract
Calabro and Wolf (1968) Inform. Contr. 11 ) investigate the autocorrelation properties of certain periodic two-dimensional arrays. This note points out a relationship between periodic p × q -arrays with two-level autocorrelation and difference sets in the group C ( p ) × C ( q ), where C ( n ) denote the cyclic group of order n . This observation enables us to construct several families of such arrays, some of which are perfect.
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