| The spread spectrum communication are widely used in military communication, satellite communication and civil fields, because of its well multiple access, lowly capture probability, the excellent performance of anti-jamming and stronger confidential. On a special occasion such as electronic warfare and confidential meeting, interference effectively on Spread Spectrum Communication is the key. So research on jamming and interference referred to the direct sequence spread spectrum communication has the important practical significance.This paper first introduce the research background, the significance of the study and development nowadays at both home and abroad. Second, the article introduce the basic principle of the direct sequence spread spectrum communication system and spreading codes ,simulate and analyze the performance of OVSF code in detail. Then, the whole DS-SS communication system is modeled and simulated,including the modulation of the DS-SS signal, demodulation of signal and statistic of the Bit Error Rate(BER). Third, this paper introduces several disturbs include blanketing jamming and deception jamming. Particularly under different length of OVSF codes, frequency aiming error responses on tone interference , pass-band of narrow-band interface and the delay of random binary code PM interface was studied in detail. The same time, analyze the relationship between SIR and Bit Error Rate on random binary code PM interference. Through comparing the computer simulation results, jamming strategy in different situations and get relevant jamming condition is analyzed.Finally, the summary of the whole dissertation and the prospects for the next step are put forward. |
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