【作者】 熊兵；

【导师】 张进民；

【作者基本信息】 西安电子科技大学 ， 电磁场与微波技术， 2002， 硕士

【摘要】 随着移动通信的飞速发展，自适应天线作为一种有效提高频谱利用率的技术正受到广泛的研究。 本文首先对自适应天线的基本原理进行了简要介绍，建立了阵列接收的同步CDMA系统离散时间传播模型，并论述了空域滤波和时域FIR滤波器的类比性，用DMI和LS—DRMTCAM算法仿真了自适应天线空间滤波性能。然后用矩量法和等效网络方法分析了自适应阵列的互耦特性，建立了考虑互耦后的阵列信号接收模型，考察了计入互耦后MUSIC来波估计算法性能，并给出了一种基于MUSIC算法的互耦矩阵求解方法。最后在矢量信道模型分析基础上，深入地研究了TD—SCDMA系统中自适应天线与联合检测相结合技术，从系统矩阵和误码率仿真两方面考察了自适应天线对联合检测性能的改善，并分析了阵列互耦和射频通道校准误差对TD—SCDMA系统上行性能的影响，为系统设计提供了依据。更多还原

【Abstract】 Wireless cellular communication is witnessing a rapid growth in markets, technology, and range of services. The increasing demand for capacity and quality motivates the need for new techniques to improve spectrum utilization. The use of adaptive antennas is one area that shows promise for increasing spectrum efficiency.This paper begins with an overview of the fundamentals of adaptive antennas. The correspondence between a spatial filter and the FIR filter is illustrated, and the spatial filter characteristic of adaptive antennas is investigated by DMI and LS-DRMTCMA algorithms. The discrete-time transmission model of synchronous CDMA systems with antenna arrays is also developed. The direction of arrival and time of arrival statistic for circular and elliptical vector channel model are derived, and efficient methods are give that can be used to simulate these models. The benefits of using adaptive antennas are also studied for 3G mobile radio system based on TD-SCDMA. hi this thesis, these benefits are explained theoretically and illustrated by computer simulation. Additionally, the mutual coupling characteristic of adaptive antennas is analyzed by MOM and equivalent network method, and the data model is built considering the mutual coupling of antennas arrays. The effect of mutual coupling on MUSIC algorithm is also studied, and we get a method to find the mutual coupling matrix based on MUSIC algorithm. Finally, the effects of mutual coupling and RF channel imbalances on TD-SCDMA are investigated, which will provide a reference for system design.更多还原