Research And Simulation Technology For Acquisition Of Spread Spectrum Signal

The main direction of the development of modern communication system to theconstruction of a long distance, large capacity, communication network having bettertransmission quality and confidentiality for the development of modern economy. Spreadspectrum communication with its unique characteristics just to meet the need of moderneconomic development, has a very broad application prospects. The core idea of spreadspectrum communication is to use the method at the expense of the signal transmissionbandwidth than the reliable transmission of signals with low signal to noise conditions torealize. But a disadvantage of spread spectrum communication is the transmission of the sameinformation under the conditions of delivery more bit stream, and the signal acquisition anddespreading process will bring trouble.Based on the spread spectrum communication theory, studies the capture method andrelated technology of spread spectrum signal, and the signal generation and capture aresimulated using the MATLAB tool. The main research work is as follows:1．According to the basic theory of spread spectrum communication, of the spread-pectrum signal and generating process, and in-depth analysis of the method of softwarerealization of pseudo code sequence (including M sequences and Gold sequences).2．Analysis of the spread spectrum signal PN code auto correlation and cross correlationproperties, and in-depth study of the pseudo code synchronization technique.3．For GPS spread spectrum communication satellite signal in high dynamic study,master the use of GPS in the pseudo code sequence specific sequences, and studies theprocess of receiving GPS receiver.4．In the grasp of the basic theory of High Dynamic DSSS signals on fast acquisitiontechnology, in-depth study of the FFT spread spectrum signal, and a simulation study usingMATLAB tools.