【作者】 张敏；

【导师】 朱刚；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2009， 硕士

【摘要】 超宽带(UWB)技术以其在近距无线通信方面的巨大优势而受到广泛关注,但因其所占频带极宽,UWB与其它通信系统存在频带重叠,使得相互之间的干扰问题成为制约UWB技术发展的瓶颈。本文利用Chirp脉冲及其正交化的思路设计UWB新型脉冲,选用对我国具有重大意义的TD-SCDMA作为共存系统进行仿真,详细地论述了采用该脉冲成形技术在消除UWB与TD-SCDMA系统干扰方面的原理、应用和效果。本文的主要研究内容和结论如下:1.对UWB技术的定义、特点和应用进行概述,阐述UWB与其他系统干扰消除的多种技术,指出传统脉冲在UWB系统应用上的优势和缺陷,研究跳时码对脉冲功率谱密度曲线的影响,为UWB脉冲功率谱的控制提供参考。2.依据TD-SCDMA在物理层、智能天线、联合检测和无线资源管理上采用的先进技术,搭建TD-SCDMA链路级和系统级两个仿真平台,并将其作为受扰系统,研究脉冲成形技术在抑制UWB对TD-SCDMA干扰方面的应用和效果。3.总结UWB脉冲成形技术的发展现状,提出脉冲设计应当遵循的四点原则;提出脉冲功率谱密度与FCC辐射掩膜匹配度的计算方法;利用多个Chirp脉冲时域叠加产生新型UWB脉冲,抑制UWB与TD-SCDMA的干扰;利用Hermite矩阵特征向量分解对Chirp脉冲进行正交化,有效消除UWB系统的多用户干扰;最后利用TD-SCDMA的两个仿真平台评价各种脉冲在消除干扰方面的效果,有效验证了Chirp脉冲及其正交化的巨大优势。更多还原

【Abstract】 Because of the obvious advantage in short-range wireless communication, ultra wide-band (UWB) systems have drawn great attention. Since UWB signals use extremely broad bandwidth for transmission by sharing the same frequency spectrum with other existing systems, interference with other systems is caused, which become the bottleneck of the UWB technique development. In this paper, based on compressed Chirp pulses and Hermite orthogonalization process, a novel method to generate UWB pulses is proposed. Selecting significant TD-SCDMA as the co-existing system, the principle, application and effect of the new pulse shaping method in the interference mitigation between UWB with TD-SCDMA system are discussed in detail.This paper is made up of the following parts:First, the definition, character and application of UWB technique are overviewed. A variety of interference mitigation solutions for UWB and other systems are introduced. The advantages and shortcomings of the traditional pulses in UWB systems application are pointed out. The effect of time-hopping code on pulses power spectral density (PSD) is studied as the reference of UWB pulses PSD control.Secondly, based on advanced Physical Layer, Smart Antennas, Joint Detection and Radio Resource Management, TD-SCDMA link-level and system-level simulation platforms are set up. With this system selected as the co-existing system, the application and effect of pulse shaping technology in mitigating UWB interference to the TD-SCDMA are studied.Last, the development status of UWB pulse shaping technology is summarized. Four-point principle of the pulse design is proposed. Calculation method of matching degree between pulse power spectral densities with FCC radiation mask is presented. New UWB pulses are generated based on multiple time-domain overlapping Chirp pulse in order to mitigate the interference between UWB and TD-SCDMA. Chirp pulses are orthogonalized by Hermite matrix eigenvector decomposition to avoid UWB system multi-user interference effectively. Finally, various pulses in the mitigating interference are evaluated through TD-SCDMA link-level and system-level simulation platforms, and compressed Chirp pulses and Hermite orthogonalization process have been proved great advanced.更多还原