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Direct Sequence Spread Spectrum the DMF capture technology simulation design

Author: XiangXiLian
Tutor: LvMing；ZhouYing
School: University of Electronic Science and Technology
Course: Electronics and Communication Engineering
Keywords: Direct Sequence Spread Spectrum Pseudo-random code m-sequence Gold code sequences Digital matched filter
CLC: TN914.42
Type: Master's thesis
Year: 2011
Downloads: 16
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Abstract


Direct Sequence Spread Spectrum (DSSS) is an effective anti-jamming communications technology , it has a strong anti-jamming capability , communication distance and high reliability , thus becoming the extensive spread spectrum technology . Having good auto-correlation characteristics and cross- correlation characteristics of the pseudo-random code of the performance of the system has an important role in the direct spread spectrum systems . The PN code is a key link in the direct spread spectrum communication system , the system can be carried out after the completion of the PN code capture spreading code tracking and demodulation . Digital matched filter as PN code to capture a kind of technology to capture fast , high- precision control simple , easy to implement , is a common capture technology . Papers based on theoretical knowledge of the pseudo-random code and digital matched filter in Matlab software made ??the autocorrelation properties and cross-correlation properties of the commonly used pseudo-random code sequence m sequences and Gold code sequences corresponding simulation . The same time , the use of Matlab software SNR of the matched filter PN code acquisition performance simulation . Meanwhile, according to the theory of knowledge of the direct spreading to the digital matched filter is the core design of the spread spectrum receiver of a fully digital , given the working principle and implementation of the various components of the entire system block diagram and the corresponding simulation waveform diagram . And downloaded to the hardware on the test . Via system simulation , FPGA design and hardware implementation, to verify the feasibility of the digital matched filter in the spread spectrum communication system , thereby achieving the despreading of the spread spectrum signal .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Spread spectrum communication
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