New Class of Spreading Sequences for Quasi-synchronous CDMA Systems

Based on the generalized Chirp-like sequences, a new class of spreading sequences was constructed with the help of the product technique and its correlation properties were discussed. The research results show that among the proposed sequences, there is a subclass of sequences with zero correlation zonewhich can be used in quasi-synchronous CDMAsystems; a complex spreading sequence can be constructed only through complex number summing and module operating when the complex number generated in the generalized Chirp-like sequences is taken as a complex unit root.