Abstract
We show that the cross correlation between two ternary m-sequences of period 3/sup n/-1 that differ by the decimation d=2/spl middot/3/sup m/+1, where n=2m+1, takes on three different values. We conjecture the same result for the decimation d=2/spl middot/3/sup r/+1, where n is odd and r is defined by the condition 4r+1/spl equiv/0 mod n. These two new cases form in a sense ternary counterparts of two previously confirmed binary cases, the conjectures of Welch and Niho (1972).
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