Abstract:To solve the limitation that conventional spread sptrum communication suffers from PN sources，a scheme of double Code Phase Shift Keying (CPSK) Spread Spectrum (SS) communication system was proposed

in which synchronization is achieved by synchronization code based on specia phase. In the system

information is transmissioned by orthogonal channels

and all SS codes come from one SS code by cyclic shifting.Synchronization is achieved by a same synchronization code which have the same special code phase in orthogonal channels

so a high correlative peak is produced in the synchronization process

which is easy to distinguish. The simulations demonstrated that the proposed shceme is easy to achieve synchronization and is effective in improving the utilization of system resources comparing to direct sequency spread spectrumm.