LARGE FAMILIES OF CODE-SEQUENCES FOR DIRECT-SEQUENCE CDMA SYSTEMS

Especially in mobile communication, the use of spread-spectrum systems has been discussed extensively because of their anti-fading capabilit y. The performance of direct-sequence code-division multiple-access sy stems depends on the correlation properties of the used code-sequences . In some applications, e.g. if cellular systems or systems with combi ned coding and spreading are considered, large families of code-sequen ces are of interest. In this contribution construction methods for the se large sets of sequences are described and their correlation propert ies (size, periodic peak correlation parameter and average interferenc e parameter) are compared.