基于MIMO的多波段脉冲超宽带传输新方法与信道模型研究

Because of the advantages of high-rate transmission, flexible use of frequency band and high efficiency, multiband impulse ultra wide-band (MultiBand-IR-UWB) has been the focus of the academics' attention. Then, the feature of the combination between high-rate transmission of MultiBand-IR-UWB and diversity multiplexing of multiple antenna can effectively improve the frequency efficiency and flexibility of UWB communication system. And the potential of improving the anti-noise performance needs to be further excavated.So, many basal researches in the technology, including modeling for multiple antenna transmission scheme and performance, are very worthwhile to study currently. Starting from the working principle of Multiband-IR-UWB, the transmission theory, implementation methods and theory mechanism of exploring the performance advantage are discussed. Moreover, the theory basis of transmission methods and performance and accuracy of mathematical model and channel model are mainly studied. The key technologies consist of the design of assignment methods by avoiding frequency-band interference, the research of signal separation methods based on linear filter and joint channel estimation algorithm between adjacent channel on the condition of multiple antenna. These key technologies are also discussed as the content of researches. Here, the filter is goten from the simulation conclusion. The outcomes of the research in this project will fullfill the theory research for MultiBand-IR-UWB system, and then improve the basis research of the physical layer design of multisensor network with UWB technology and provide new method.

多波段脉冲超宽带技术（MB-IR-UWB）因具高传输速率，频谱利用灵活且效率高等优点，成为国外学者关注的焦点。而该技术结合多天线分集复用有效提高系统空分特性，改善系统抗噪性能的潜力还有待挖掘。因此，针对多波段脉冲超宽带的多天线传输方法及其性能的数学建模等相关基础研究是目前亟待探讨的问题。本课题从多波段脉冲超宽带的工作原理出发，研究基于多天线的MB-IR-UWB传输理论与实现方法，探索性能优势的理论机理。重点研究系统传输方法及性能的理论构架与数学模型及与之相适应信道模型的准确性。基于频段干扰回避的分配方法设计、基于滤波的信号分离方法研究，滤波器作为实际仿真验证结论给出、多天线条件下，相关信道间的联合信道估计算法等关键技术的探讨也是本课题的研究内容。该项目的研究成果将填补国内对多波段超宽带系统理论研究的空白，进而推动应用超宽带技术的多传感器网络物理层设计的基础研究并提供新思路。

多波段脉冲超宽带技术（MB-IR-UWB）因具有高传输速率，频谱利用灵活且效率高等优点，成为国外学者关注的焦点，而该技术结合多天线分集复用能够提供系统空分特性，提高系统性能。PSWF脉冲由于其自身良好的带限和正交特性，可以用于超宽带脉冲波形的设计，故本项目构建了一种基于PSWF的MIMO MB-IR-UWB的系统。本项目首先研究了基于PSWF的脉冲成型技术和MIMO MB-UWB信道模型，在此基础上搭建了MIMO MB-IR-UWB的系统模型，并研究了基于TR方式的和基于FDE方式的均衡算法，指出了两种算法的优势与局限性；后对系统进行了电磁兼容性的分析，研究了该系统中存在的几种干扰形式，并研究了可用于该系统的干扰抑制方案并评估了抗干扰性能；根据子波段划分方式给出了4种可用的系统工作模式，对各模式对应的系统容量进行了分析，并将空时频编码方案应用于该系统中，与4种工作模式相结合，最终给出了4种最优系统传输方案。