【作者】 李宗政；

【导师】 陈如山；

【作者基本信息】 南京邮电大学 ， 电子与通信工程， 2012， 硕士

【摘要】 随着社会不断的进步和发展,使得人们对无线移动通信的质量要求也就越来越高。由于无线信道作为无线移动通信的最基本的媒介,因此,对无线信道的研究分析是非常有意义有必要的。室内环境是一个非常重要的应用环境,在室内无线电波不受气候因素影响,但是室内本身的环境却是非常复杂,要受到室内的墙壁、玻璃、家具、行人等一系列障碍物的影响,信号到达接收点时需要经过直射、反射、绕射等多种传播机制,这些都引起了许多研究学者对无线信道的研究产生了浓厚的兴趣。弹跳射线法(SBR, Shooting-and-Bouncing Ray)是一种被广泛应用在实际环境电磁分析里的高频算法,具有所需计算机内存少以及计算速度快的优点。它适用于对无线信道的特性参数进行深入的研究,能够快速有效的提供比较好的预测结果。本文运用弹跳射线法计算出部分区域的频率响应,并根据频率响应分析了无线信道的相关特性。本文的主要内容以及所作的贡献如下:(1)通过对国内外相关文献的阅读,掌握了无线信道、无线电波的传播、物理光学法以及几何光学法的基本理论,并对无线信道的一些特性进行了阐述。(2)对弹跳射线法进行了深入的研究,并给出散射问题的算例结果,通过与商业软件的结果比较以及与文献的结果比较,验证了基于弹跳射线法程序的正确性。(3)利用Fortran语言对弹跳射线法算法程序进行修改。从频域的角度对无线信道进行研究,运用基于该算法的程序计算出具有较复杂结构的特定无线信道的频域响应,并根据频域响应对无线信道的频率相关路径损耗、频域相关系数、相干带宽以及rms(均方根)时延与相干带宽的关系进行了深入的研究。更多还原

【Abstract】 With the development of society, people’s demand of the quality of wireless communications have become increasingly. As the wireless channel is the wireless communication medium, so the study of the wireless channel is necessary. Indoor environment is a very important application environments, for radio waves in indoor can escape from climate factor, but the indoor environment is very complex and subject to interior walls, furniture, pedestrian and a series of obstructions, the signal has to Transmit through direct, reflection, diffraction, etc. to reach the receiving point, which are causing more and more interest in the study researchers .SBR is a widely used high-frequency algorithm with the benefit of high accuracy and fast calculation. It applies to research the characteristics of indoor radio channel, can provide higher accuracy predictions. In this paper, SBR gives the frequency response of the interior region, and analysis the characteristics of the wireless channel based on the frequency response.The paper’s main content and contributions are as follows:(1) through the reading of relevant literature, mastered the wireless channel, radio wave propagation, the physical optics method and the basic theory of geometrical optics method, and some of the radio channel characteristics are described.(2) through the in-depth study of the SBR, give numerical results with the results of business software comparison chart and the numerical results with the results of the literature comparison chart to verify the correctness of the algorithm .(3) Use Fortran to modify the SBR algorithm. From the frequency domain angle of the indoor channel’s study, give the radio channel frequency response by high-frequency algorithm, and in-depth study about frequency-dependent path loss, frequency-domain correlation coefficient, coherence bandwidth, and the relationship of rms delay and coherence bandwidth based on frequency response of the wireless channel.更多还原