| Extra-short pulse communication of ultra wide band is a new communication technology besides narrow-band link and broad-band communication. It has characteristics with large capacity, low radiation power density, anti-multipath interference, classified electromagnetism interference and simple structure. Parallel combinatory spread spectrum has characteristics with anti-interference, frequency efficiency, strong massage-transmission and high anti-crack. The efficiency and security are the important technologys index of modern communication system. PCSS and UWB have high communication and security capacity, so they become the hot spots of the research.This paper analyzes the characteristics between UWB and PCSS and combines the advantages of them to give a new UWB communication program based on parallel combinatory spread. Solving the problems on theory and implementation techniques, and making the new communication plan has the ability of efficiency and security.This paper discusses modulation methods of the new special system structure and mechanism based on modified UWB of PCSS. The application of UWB communication model and multi-system pulse position modulation and multi-system orthogonal keying modulation methods are also discussed. At last, it simulates and checks the feasibility of the two modulations in the new systematic. |
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