Research And Implementation On The Digital Method Of Carrier Frequency Estimation Of DSSS Signal

The topic of this paper comes from the need of pricise carrier frequence measuring of Direct Sequence Spread Spectrum signal.Its purpose is to develop an all digital method that can complish despreading and carrier frequency measuring by the use of modern signal processing technique and to manufacture a set of frequence measuring and correcting system to fit the project demand.Aiming at the Direct Sequence Spread Spectrum signal, this paper presents the approach of multi-assumption and match-filtering with the least square theory to estimate the frequency. In this paper, we analyzed the performance of our approach with theoretical method in communication principles, signal detection and estimation and pseudo signal processing; and finally we offered the ideal performance curve. In this paper, the design of the frequency measurement and correcting system can be achieved with less cost, and it also offered the system performance test.The testing results demonstrate that the method can capture the pseudocode at a fast speed , tract it in precision,and can get the exact value of frequency.So the method have a wide utilizing area.