【作者】 张建明；

【导师】 王建英；

【作者基本信息】 西南交通大学 ， 信号与信息处理， 2005， 硕士

【摘要】 随着移动通信业务的飞速发展、用户数量的急剧增长、移动计算与蜂窝互联网的业务需求,现有的第二代移动通信技术在系统容量、通信质量和提供的数据业务等各方面已经难以满足需求。因此,人们提出发展新一代的移动通信技术——第三代移动通信系统(IMT-2000)。在IMT-2000标准中,WCDMA以其固有的诸多优点成为主流多址方式,而WCDMA是干扰受限系统,因此必须采取更为有效的干扰抑制技术。自适应阵列技术(或智能天线技术)与传统RAKE技术相结合的空时信号联合处理技术在扩大小区范围、提高系统容量和频谱效率、降低发射功率、减小用户干扰等方面显示了巨大的潜力,成为当前移动通信领域的一个研究热点。 本文以第三代移动通信系统中的标准之一——WCDMA系统的上行链路空中接口为背景,首先分析无线通信系统中发射机与接收机之间的无线信道和传播特性,以明确所研究的2D-RAKE接收机(空时二维RAKE接收机)所处的环境和要解决的问题,然后介绍了天线阵、阵列波束形成算法和WCDMA的物理层技术,而这是2D-RAKE接收机研究的基础;在此基础上分析研究了2D-RAKE接收机的框架结构和阵列的的自适应处理算法,重点对LS-DRMTA(最小二乘解扩重扩多目标阵列算法)进行分析研究,并根据WCDMA的物理层上行链路的特点,结合LMS(最小均方)算法,得出一种新的适合WCDMA物理层上行链路的特点的LMS-DRMTA波束形成算法,计算机结果证实了算法的有效性。理论分析和仿真结果表明,采用该方案不但进一步减小了基站阵列处理的计算量,同时在系统的BER性能和系统容量方面都有明显的改善和提高。更多还原

【Abstract】 With the rapid development of mobile communication services, increase of user number, the requirement of mobile computation and cellular internet work, the existing 2G mobile communication techniques can not satisfy the need of system capacity, quality and services, so the new generation mobile communication technique — — 3G mobile communication system(IMT 2000) is proposed. In IMT-2000 standards, CDMA has become the primary multiple access technique because of its many benefits, but CDMA system is interference-limited, so more efficient interference suppression techniques are required. The space-time processing technique which is the combination of the adaptive antenna array and conventional RAKE receiving technique shows real potential for increasing cellular coverage, system capacity and spectrum efficiency, reducing transmitting power and interference etc. Thus it becomes one of the research hotspots of current mobile communication field.Basing on the uplink of WCDMA system, firstly, the thesis analyzed the channel and the radio characteristics between transmitter and receiver in the radio communication system ,to explicit the environment and the problem to solve, then it introduced the antenna array, the beamforming algorithm and the WCDMA physical layer. They are research foundation of the 2D-RAKE receiver. After the study work mentioned above, the thesis analyzed the framework structure of the 2D- RAKE receiver and self-adapting algorithm of array.Then the thesis emphersised on the更多还原