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超宽带技术已经逐渐成为无线通信领域开发的一个热点,并被视为下一代通信的关键技术之一,因为其具有高的传播速率、大的系统容量、抗多径干扰能力和低功耗低成本等这些优点。以极窄的脉冲来传输数据比特,产生宽达数 GHz 的带宽, 超宽带(UWB)通信的传输速率可高达每秒 500M 甚至更高。但是它的发射功率受到限制,这样 UWB 传播的有效距离一般在 10 米之内,所以其主要用途为室内高速率短距离数据传输。因此研究室内环境中超宽带信号传播的信道特性,有着重要的理论意义和实用价值。
一致性几何绕射理论(UTD)方法是一种高频射线方法,主要用于分析电大尺寸目标的电磁特性。时域一致性几何绕射理论(TD-UTD)作为 UTD 对应的时域解法,在不耗费很大的计算机资源和时间的情况下能准确的给出瞬态电磁场反射和绕射的全部信息,在涉及宽带问题时比 UTD 表现出很大的优越性。本文主要研究内容是 TD-UTD 理论及其应用,即用于超宽带信号在室内传播的信道仿真。
本文首先简要介绍了超宽带技术及其特点,然后详述了一致性几何绕射理论(UTD)的基本理论。在此基础上重点讨论了时域一致性几何绕射理(TD-UTD),包括其基本原理,曲边缘模型的 TD-UTD 绕射系数表达式和凸曲面模型 TD-UTD 反射和绕射系数表达式。最后通过一些具体算例验证 TD-UTD 公式的正确性。
最后,本文将 TD-UTD 方法应用于超宽带信号室内传播的信道模拟。通过一些理想环境和一个现实环境的仿真,证明了用 TD-UTD 方法研究室内环境中超宽带信号的传播信道的可行性。
关键词:时域一致性几何绕射理论(TD-UTD)、超宽带(UWB) 、曲边缘模型、凸曲面模型、绕射系数
Abstract
Ultra wideband technology has gradually e a hot of the munication field. It is regarded as one of the key technologies in the next munication because of the advantages such as high transmission rate, big system capacity, the ability of anti-multipath interference, low power consumption and low cost etc. Ultra wideband (UWB) communication transmits data bit by a very narrow pulse whose bandwidth is up to several GHz, and the transmission rate can be up to 500M per second or higher. However, because of the emission power limited, the effective distance of the propagation is within the range of 10 meters. So, it is mainly used in indoor short distance and high data rate transmission. Therefore it has important theoretical significance and practical value to research indoor propagation channel characteristics of ultra wideband signal.
The uniform geometrical theory of diffraction (UTD) method is a high frequency ray method, mainly used for the analysis of ic characteristics of electrically large targets. As the time domain solution of UTD, time domain uniform geometrical theory of diffraction (TD-UTD) can give accurately all the information of transient ic reflection and diffraction, not consuming puter resources and time. TD-UTD method shows
超宽带技术已经逐渐成为无线通信领域开发的一个热点,并被视为下一代通信的关键技术之一,因为其具有高的传播速率、大的系统容量、抗多径干扰能力和低功耗低成本等这些优点。以极窄的脉冲来传输数据比特,产生宽达数 GHz 的带宽, 超宽带(UWB)通信的传输速率可高达每秒 500M 甚至更高。但是它的发射功率受到限制,这样 UWB 传播的有效距离一般在 10 米之内,所以其主要用途为室内高速率短距离数据传输。因此研究室内环境中超宽带信号传播的信道特性,有着重要的理论意义和实用价值。
一致性几何绕射理论(UTD)方法是一种高频射线方法,主要用于分析电大尺寸目标的电磁特性。时域一致性几何绕射理论(TD-UTD)作为 UTD 对应的时域解法,在不耗费很大的计算机资源和时间的情况下能准确的给出瞬态电磁场反射和绕射的全部信息,在涉及宽带问题时比 UTD 表现出很大的优越性。本文主要研究内容是 TD-UTD 理论及其应用,即用于超宽带信号在室内传播的信道仿真。
本文首先简要介绍了超宽带技术及其特点,然后详述了一致性几何绕射理论(UTD)的基本理论。在此基础上重点讨论了时域一致性几何绕射理(TD-UTD),包括其基本原理,曲边缘模型的 TD-UTD 绕射系数表达式和凸曲面模型 TD-UTD 反射和绕射系数表达式。最后通过一些具体算例验证 TD-UTD 公式的正确性。
最后,本文将 TD-UTD 方法应用于超宽带信号室内传播的信道模拟。通过一些理想环境和一个现实环境的仿真,证明了用 TD-UTD 方法研究室内环境中超宽带信号的传播信道的可行性。
关键词:时域一致性几何绕射理论(TD-UTD)、超宽带(UWB) 、曲边缘模型、凸曲面模型、绕射系数
Abstract
Ultra wideband technology has gradually e a hot of the munication field. It is regarded as one of the key technologies in the next munication because of the advantages such as high transmission rate, big system capacity, the ability of anti-multipath interference, low power consumption and low cost etc. Ultra wideband (UWB) communication transmits data bit by a very narrow pulse whose bandwidth is up to several GHz, and the transmission rate can be up to 500M per second or higher. However, because of the emission power limited, the effective distance of the propagation is within the range of 10 meters. So, it is mainly used in indoor short distance and high data rate transmission. Therefore it has important theoretical significance and practical value to research indoor propagation channel characteristics of ultra wideband signal.
The uniform geometrical theory of diffraction (UTD) method is a high frequency ray method, mainly used for the analysis of ic characteristics of electrically large targets. As the time domain solution of UTD, time domain uniform geometrical theory of diffraction (TD-UTD) can give accurately all the information of transient ic reflection and diffraction, not consuming puter resources and time. TD-UTD method shows
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