第三代移动通信系统中空时多用户检测研究

【作者】 宋涛；

【导师】 张捷；

【作者基本信息】 西北工业大学 ， 通信与信息系统， 2003， 硕士

【摘要】 第三代移动通信系统中，多址干扰是一个主要的干扰源，应用多用户检测技术消除多址干扰日益成为关注的焦点，因此，在对智能天线理论和多用户检测原理深入分析的基础上，本文提出了一种在码分多址移动通信系统中，将智能天线应用于多用户检测的空时检测方案，本文的主要工作概括如下。 在单径情况下，基于最小均方误差原则和最大似然原则，提出了一种多用户检测算法和一种空时二维多用户检测器的结构。仿真性能分析说明了比传统的单用户检测有较大的性能改进。在此基础上，将单径情况推广到多径情况，提出了一种多径情况下的多用户检测器的结构。同时，由于第三代移动通信系统具有有限字符特性，并且存在上行链路导频信息，本文基于这两点对SAGE算法进行了改进。更多还原

【Abstract】 In the 3G mobile communication system, Multiple Access Interference is the main source of interference; so, Multi-user detection as a way to eliminate MAI is focused .Based on the thorough analysis of the smart antenna theory and multi-user detection, this paper introduces a space time detection scheme of embedding the smart antenna array into multi-user detection in CDMA mobile communication system. The main works of the dissertion are as follows.On single path condition, the multi-user detection algorithm is derived on the basis of the minimal square rule and the ML rule. A space-time multi-user detection structure and an adaptive method on CDMA system are proposed. The performance of the algorithms proposed is much better than that of traditional single-user detection. Also using the MMSE rule and the ML rule, we derives an algorithm on condition of asynchronous multi-path, and a space time multi-user detection is proposed. In the meantime, an improvement about the SAGE algorithm is proceeded on the basis of finite alphabet characteristic and pilot information of the 3G communications system.更多还原