Abstract

Ternary perfect sequences, which include the binary perfect sequences as special cases, are introduced. The new notions of elementary transformations on ternary perfect sequences are brought forward. Necessary conditions for ternary perfect sequences with k zero elements are proposed. It is proved that there exist no ternary perfect sequences of even lengths with one zero element, and no ternary perfect sequences of odd lengths with two zero elements. It is also proved that there exist no ternary perfect sequences of any length with two adjacent zero elements. An efficient search algorithm for ternary perfect sequences is given.

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