智能天線的DOA估计算法研究.doc

题目：智能天线的DOA估计算法研究 院（系） 信息科学与工程学院 专 业 通信工程 届 别 　　　 2012　　　 学 号 　　　 0815231014　　 姓 名 　　　 董世杰　　　 指导老师 博士 谭鸽伟 华侨大学教务处印制 2012年5月 摘 要 随着全球通信业务的迅速发展,作为目前通信主要手段的无线移动通信技术已经引起人们极大关注，并取得了一定的成就。无线通信系统对数据速度、覆盖范围和不同系统间的兼容等性能要求越来越高，定向性和抗干扰能力成为天线的主要性能指标，在这种情况下，研究如何进行干扰抑制和减少多径衰落的影响就成为提高无线移动通信系统性能的一个重要课题。随着移动通信卫星通信、雷达等领域系统功能的日趋完善，智能天线系统、多波束天线系统等具有自适应功能的天线的研究和应用正在不断深入，其中，波束形成（BF）技术是自适应天线系统的核心，该技术是基于传统天线波束形成理论跟数字信号处理技术的，在自适应天线系统中有着广阔的应用前景。 本文先对智能天线的出现和发展过程做简要的介绍，并说明智能天线结构和性能上的优势 ；然后说明了DOA估计的基本原理，并介绍了MUSIC算法，接着采用MUSIC算法对智能天线的DOA估计进行matlab仿真，在性能上对算法进行测试和分析。 关键词：智能天线 波达方向 估计算法 多重信号分类算法 ABSTRACT With the rapid development of global communications services, as the current primary means of communication for wireless mobile communications technology has been cause for great concern, and have achieved some success.?Data rate wireless communication systems, coverage, and compatibility between different systems such as performance requirements are high, directional antennas and anti-jamming capability to become the major performance indicators, in this case to examine how the reduction of interference suppression and multi-fading of the wireless mobile communication system for enhancing the performance of an important topic.?With the mobile communications satellite communications, radar, and other areas of system function are maturing, smart antenna systems, multi-beam antenna systems with adaptive antenna functions of research and applications are constantly in-depth, which, beam-forming (BF) technology is adaptive?antenna system, the core of the technology is based on the traditional theory of antenna beam-forming technology with digital signal processing, adaptive antenna systems in broad application prospects. This article first appeared on the smart antenna and a brief description of the development process, and illustrate the struc