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中文摘要：
由于脉冲超宽带通信系统可以无需许可地与其他系统共享工作频带，因此其功率谱受到严格限制，为了能够有效控制功率谱来满足特定频谱要求，通过理论分析的方式研究了多址方式、调制方式以及基带脉冲波形对功率谱的影响．基于此分析，深入研究了采用脉冲极性随机化处理、最大化功率利用率波形设计和码谱设计等方法控制功率谱的问题，并进行了具体设计和仿真验证．结果表明，综合采用上述方法，可以使系统具有灵活的频谱特性．
英文摘要：
The impulse tems in an unlicensed spectrum to meet the baseband impulse on ultra-wideband （UWB） communications systems share the spectrum with other sys manner. This has caused a strict spectral constraint. In order to shape the power specific spectral mask, the impacts of multi-access methods, modulation formats and the power spectral density （PSD） are analyzed theoretically. Based on the analyses, the power spectral density control combined with the randomization of pulse polarity, baseband pulse design with maximizing the power utilization and code spectrum design is studied. And some concrete design results and emulation are given. It shows that the combination of the three methods can make the UWB communications system have flexible spectral characteristics.
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