【作者】 王欢；

【导师】 许洪光；

【作者基本信息】 哈尔滨工业大学 ， 信息与通信工程， 2006， 硕士

【摘要】 在移动通信蓬勃发展的今天,超宽带技术由于具有传输速率高,功耗低,安全性好,抗多径能力强以及成本低廉等优点受到越来越广泛的重视。超宽带通信系统利用纳秒至皮秒级的非正弦波窄脉冲传输数据,非常适合作为城区及室内密集多径环境下的应用,并且能够与现有的传统窄带系统共存。因此,业界普遍认为它是未来短距离高速无线通信与测距定位系统的最佳解决方案。但由于超宽带是一项新兴的技术,市场对于超宽带的两种标准存在分歧,且国内外的研究都正处于起步阶段,还有许多不成熟的地方,这些都限制了超宽带技术的广泛应用。本课题研究的目的在为超宽带信号的同步和信道估计提供理论依据,为课题项目的实际应用提供参考依据。本文通过大量的仿真以及实测的数据分析了信道模型,在参考了大量文献的基础上给出了较为实际的同步方法和信道估计方法,并进行了大量的仿真验证,其中同步方法在结合信道模型的基础上给出了仿真结论,信道估计方法最后应用于实测数据当中,得出了较为理想的结果。本文的研究内容主要包括以下几个方面:(1)采用仿真与实测相结合的方法,分析了现有的室内信道模型。(2)研究并设计出基于巴克码(barker)的一种新的同步方法,提高了检测效率,满足了对于实际应用简洁、高速的需求。(3)采用数学公式推导出基于MUSIC算法的信道估计的理论公式,得出了仿真结果,将其与较为成熟的ML算法比较,并在实测数据中加以验证。本文中由实验和仿真得到的结论反映了超宽带信号同步和信道估计的特点,为超宽带技术的进一步应用提供了理论基础;其中提出的新的同步和信道估计方法对提高检测效率、增加检测精度、简化系统设计具有一定的参考价值。更多还原

【Abstract】 At present, lots of communication technologies are developed, but Ultra-Wideband (UWB) technology becomes more and more attractive because of its advantages, such as high transmission rate, low power consumption, good security, robustness to multipath and low cost. It is a novel short-distance wireless communication technique, in which data are transferred using non-sinusoidal pulses with very short duration, so it is fit for using in indoor environments which is a typical multipath environment. And it can be coexisted with the existing wireless communication systems at the same frequency band. As a matter of fact, UWB is thought as the best way of solving short distance wireless communication and wireless location. Howerver, UWB is still a new technology, so it is not mature enough to be used, and there’s some divergences about the standard in application.This thesis aims at establishing a good theory for the synchronization and channel estimation in UWB system and providing some theoretical proof for the real project.Through a lot of experiments and simulations, analyzing the UWB channel model, studying on many papers, a new synchronization algorithm based on barker code and a new channel estimation method based on MUSIC algorithm are given. The simulation results of synchronization algorithm in which UWB channel model is used are gotten ,and the channel estimation algorithm is demonstrated by measurement data. Anyway, both of them get good conclusions.In this thesis, the thesis includes the following parts:(1) According to many simulations and the data of real measurement, the UWB indoor channel model is analysed.(2) A new synchronization method based on barker code is designed which is simple, effective for UWB system.(3) A new channel estimation method based on MUSIC algorithm is given, which is compared with ML algorthim. And the effection is proved by更多还原