智能天线算法研究

【作者】 石敏；

【导师】 郭陈江；

【作者基本信息】 西北工业大学 ， 电磁场与微波技术， 2003， 硕士

【摘要】 先进的多址接入和智能天线技术为解决有限的频率资源利用问题提供了可行的思路和方法。目前智能天线技术的研究主要针对小区基站展开，面向移动终端的应用尚未充分开展。本文主要研究智能天线技术在CDMA系统移动终端的应用。主要研究内容和结论如下： ■ 讨论并建立适用于空时信号处理的无线衰落矢量信道模型。 ■ 在总结应用于CDMA移动终端的智能天线算法基础上，提出一种利用接收信号与期望信号相关特性的新型智能天线算法。通过分析和天线方向图仿真，证明新算法在收敛速率和复杂度上有较大改善。 ■ 提出4种应用于CDMA移动终端的SA-RAKE级联结构。 ■ 搭建了TD-SCDMA智能天线移动终端仿真平台，通过双天线系统移动端接收特性的数值模拟，对智能天线算法和4种SA-RAKE处理结构进行分析。并深入分析了智能天线对多径的抑制作用。 ■ 基于仿真平台的数值模拟结果表明在TD-SCDMA系统移动终端采用智能天线可以有效提高信号接收质量、降低误码率和增加系统容量。更多还原

【Abstract】 Taking full advantages of limited spectrum resources is critical in improving the capacity and quality of communication system at present. Two feasible solutions are code division multiple access and smart antenna technology. Many research works on smart antenna are focused on base station, whereas the application for mobile terminal has not been fully developed. This dissertation investigates the use of smart antenna at mobile terminal in CDMA wireless network. The main contents and conclusions are as follows:Deals with statistical vector channel model applied to smart antenna simulation. Several key factors such as signal fading and multi-path effect are further analyzed and simulated.Summarizes smart antenna algorithms for CDMA mobile terminal. Proposes a new algorithm for estimating the vector channel and the optimum beamforming weights. Studies its tracking performance under realistic channel conditions. Finally gives the simulation of antenna’s pattern.Discusses SA-RAKE technique for improving system performance, and develops four SA-RAKE receiver structures.Presents an overall link level simulation of mobile terminal receiver structure with smart antenna for TD-SCDMA and describes its building blocks. Three smart antenna algorithms and four structures of SA-RAKE arc simulated and compared based on above model. The restraint of SA on multi-path is further analysed.In conclusion, the proposed receiver may improve BER, SNR and Capacity performances of wireless communication system obviously.更多还原