Abstract
Ternary (–1, 0, +1) almost-perfect and odd-perfect autocorrelation sequences are applied in many communication, radar and sonar systems, where signals with good periodic autocorrelation are required. New families of almost-perfect ternary (APT) sequences of length N = (pn – 1)/r, where r is an integer, and odd-perfect ternary (OPT) sequences of length N/2, derived from the decomposition of m-sequences of length pn – 1 over GF(p), n = km, with p being an odd prime, into an array with T = (pn – 1)/( pm – 1) rows and pm – 1 columns, are presented. In particular, new APT sequences of length 4(pn – 1)/(pm – 1), (pm + 1) = 2 mod 4, and OPT sequences of length 2(pn – 1)/(pm – 1) with peak factor close to 1 when p becomes large, are constructed. New perfect 4-phase and 8-phase sequences with some zeroes can be derived from these OPT sequences. The obtained APT sequences of length 4(pm + 1), p > 3 and m – any even positive integer, possess length uniqueness in comparison with known almost-perfect binary sequences.
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