Design and implantation of a code synchronization circuit for DSSS

Direct sequence spread spectrum communication system have played an outgrowing role in modern communication systems for both military and civil applications due to its unique features. Spread spectrum modulation systems initially design to send digital signal data under difficult conditions of a very low signal to noise ratio (SNR) due to the low signal level (transmission with low probability error). In this article, direct sequence spread spectrum communication system (DS/SS) with synchronization and tracking circuit inside it is designed and implemented using MATLAB/Simulink. This study designed and implemented all parts of synchronization system, such as active correlator, acquisition subsystem, tracking subsystem, search/lock control unit (SLCU) subsystems and local PN generator. Information can be send safely and received separately without knowing the code used in the sending circuit, this work achieves obtaining an optimum code in the receiving circuit similar to the code in the sending circuit by linking all the parts together.