| The research on Ultra Wideband (UWB) communication technology shows more significant in resent years. UWB technology has the features of device infrastructure simpless, lower transmission power, higher gain and data rate, multipath resolution capability. It can be deployed for military communications, fimaly entertainment and office. As a new technology, it faces lots of practical questions, such as anti-interference and multiuser accessibility. This thesis mainly discusses the key technologies in UWB communication technology, and it can be devided into three parts: research on multipath and multi-access performance of UWB system, analysis of multi-access code of UWB system, research on multi-user detect of UWB system. According to the key technologies on UWB system, the creativities are included in :1) It provided a research method on Rake receiver, analyzed the performance of A-Rake, S-Rake and P-Rake by theoretical deduction and computer simulation.2) Based on multipath, analyzed the multi-access performance of UWB system, and validated the result by simulation.3) Based on the way to construct permutation sequense code and comparisons of the characteristics of correlation, a method on calculating the primitive was proposed. The simulation result shows that PSC code is a kind of efficient code for UWB.4) It proposed an adaptive interference cancellation algorithm based on multi-access parallel interference cancellation and adaptive algorithm.
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