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It is known that the out-of-phase autocorrelation values of modified Jacobi sequences of period pq, p, q prime, are depend only on the difference between p and q. In this paper, the array structure of modified Jacobi sequences is studied. Based on the structure, their autocorrelation functions are computed clearly, and some modifications of modified Jacobi sequences can be obtained.

Sequence pairs with good correlation can be applied in many practical systems. In this Letter, the authors construct a class of p-ary sequence pairs of period 2p 2 by interleaving two p-ary sequences derived from Fermat quotient, where p is an odd prime. In the authors' construction, sequence pairs have almost perfect correlation.