A set of binary sequences obtained from 4 preferred m-sequences

We have an interest in a set of binary sequences with large family size and lower maximum correlation values for the CDMA system. In this paper, we show the new sets of binary sequences with large family size, whose period of the sequences is equal to 2^m-1, m an integer, obtained from 4 preferred m-sequences. The nontrivial maximum correlation value and family size of our sets are shown to have 2² times and 2^2m times, respectively, as large as those of Gold family.