Quaternary Sequences with Good Autocorrelation Constructed by Gray Mapping
A quaternary sequence is constructed by Gray mapping of a binary sequence with even period and its shift. The autocorrelation of the new quaternary sequence is the same as that of the binary sequence employed. Quaternary sequences with the maximum autocorrelation 2 can be obtained by the construction for period N equivalent to 2 (mod 4).
quaternary sequences sequences autocorrelation gray mapping