Realization Of Spread Spectrum Sequence Synchronization By Digital Method In Radio Receiver

Spread Spectrum (SS) communication is one of communication methods, which have vast vista. For its particular capability, it is widely used in the fields of military and civil communication.The synchronization of Spread Spectrum (SS) sequence is the most important but much more difficult one. With the rapid development of digital devices, the advantages of the digital system are becoming more and more attractive. The paper will discuss the scheme of spread spectrum synchronization by digital method. Other than traditionally theory analyze and discussion of digital correlator which is laid after demodulator, a scheme based on non-interrelated correlative DLL will be discussed in this paper after referencing the theory and the result of simulation. The demodulated data and the information of carrier are not need in this plan. We sample the result of correlation between local sequences and the received signal, then realizing the code synchronization by software. The system has the advantages of having simpler hardware circuit, easier to debug and improvement. It also can be introduced more synchronize scheme. Because of its main body is realized by software, it is convenient to add acquisition function to the DDL.In the fourth chapter, we introduce the special work in this paper. It contains constructing hardware platform, defining software module, researching the method of data accumulating.