With the rapid development of the Internet technology, e-commerce rapid development and mature gradually as a kind of brand-new enterprise management means. Under the e-commerce environment, trade both parties in order to fight for the limited resources, and produce controversy and conflict inevitably. Under the background in the application of e-commerce, and auto-negotiation is an
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With the rapid development of the Internet technology, e-commerce rapid development and mature gradually as a kind of brand-new enterprise management means. Under the e-commerce environment, trade both parties in order to fight for the limited resources, and produce controversy and conflict inevitably. Under the background in the application of e-commerce, and auto-negotiation is an
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Human societies are composed of heterogeneous individuals in interests and reasoning patterns. This has often led to conflicts in the meanings of their interactions, increased uncertainty in the outcomes of their behavior and complexity in decision making. To mitigate these problems humans have established conventions which are general agreements on language, meaning and behavior. The
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With rapid development of wireless communications technology, many short-range wireless smart devices are emergying in recent years, and wireless adhoc techonology is widely used in many scenarios, among which opportunistic network has been concerned more and more frequently. Opportunistic network is kind of mobile adhoc network, while differs from traditional network, it’s not necessary that
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In recent years, Chinese e-government building continues to accelerate, and developing the e-government has become the power of promote our country’s economic and social development. Currently, the government has not only their own web sites and their web servers, but also carries out some business on the net, and improves the office efficiency greatly. However,
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Compared with cable communication, wireless communication suffers from varying channels, especially the mobile communication. On one hand, fading and shadowing make the wireless channel time-varying, on the other hand, with the development of radio access technologies, the spectrums to bear kinds of radio access technology become scare. Meanwhile, users need various service types in different
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In wireless communication systems, channel fading is one of the great challenges to transmission rate improvement and system reliability. In order to combat fading effects, Signal Space Diversity (SSD) technique is invented. In this thesis, in-depth researches are conducted concentrated in this key technique and its application in traditional BICM systems, OFDM systems and relay
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MIMO technology will become an important wireless communicationtechnology in future because it could significantly increase channel capacity byseveral orders of magnitude without based on additional frequency bands. However,in actual communication systems downlink, multi-cell MIMO technology is facedwith interference from users and inter-cellular. With the fact that traditional diversitytechnology and launch strategy can only improve link
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Signal fading due to multi-path propagation is one of the major impairments to meet the demands of next generation wireless networks for high data rate services. To mitigate the fading effects, time, frequency, and spatial diversity techniques or their hybrid can be used. Among different types of diversity techniques, spatial diversity is of special interest
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With the expansion of the high-speed railway industry and the improvement of railway speed worldwide, the reliability and efficiency of the high speed train to ground wireless communication, which is dedicated to railway transportation, attract the public attention. Based on the features of the high speed train to ground wireless communications, this thesis point out
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