Abstract: Based on sequences with two-level correlation and optimum quadriphase sequences, a new family of quadriphase sequences with parameter (2^2J-1,2^J+1,2^J+1) is proposed for a class of positive integers J. The new sequences family is optimal with respect to Welch’s lower bound on the maximum nontrival correlation value and it is suitable for CDMA.

Key words: CDMA comunication, Sequences with ideal two-level autocorrelation, Optimum quadriphase sequence, Welch’s bound