第三代移动通信系统中空时多用户检测研究
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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。
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.
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。
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.
引文
1．吴伟陵，《移动通信中的关键技术》 北京邮电大学出版社 2000．11
2．邱玲等，《第三代移动通信技术》 人民邮电出版社 2001．8
3．杨大成等，《cdma2000技术》 北京邮电大学出版社2000．11
4．王永良，彭应宁，《空时自适应信号处理》 清华大学出版社 2000．9
5．张贤达，保铮，《通信信号处理》 国防工业出版社2000．12
6．曹志刚，钱亚生，《现代通信原理》 清华大学出版社 1992．8
7．李见新等 《现代通信系统分析与仿真MATLAB通信工具箱》 西安电子科技大学出版社 2000．11
8．张林让，“自适应阵列处理稳健方法研究”，西安电子科技大学博士学位论文，1999
9．金梁，“基于时空特征结构的阵列信号处理和智能天线技术研究”，西安交通大学博士学位论义，1999
10．诸晓英，“Turbo码及其于多用户检测的联合应用”，西北工业大学硕士学位论文，2002
11. Ruifeng Wang, "Spatial-Temporal signal processing for multi-user CDMA communication systerms", Ph.D dissertation of Queen's University, 1999
12. H.E. Gamal, E.G. Senior, "Iterative multiuser detection for coded CDMA signals in AWGN and fading channels", IEEE Journal on Selected Areas
in Communications, vol. 18, No.1, Jun. 2000．
13． M. Moher, " An iterative multiuser detection for near-capacity communications" ,IEEE Trans. Commun., vol. 46, pp870-880, July 1998
14． Xiaodong Wang and H.Vincent Poor, "Space-time multi-user detection in multipath CDMA channels" , IEEE Trans. Commun, vol. 47, No. 12, pp2356-2374, Sep. 1999
15． John G. Proakis 《Digital Communications》 McGraw-Hill Companies, Inc. 2001
2．邱玲等，《第三代移动通信技术》 人民邮电出版社 2001．8
3．杨大成等，《cdma2000技术》 北京邮电大学出版社2000．11
4．王永良，彭应宁，《空时自适应信号处理》 清华大学出版社 2000．9
5．张贤达，保铮，《通信信号处理》 国防工业出版社2000．12
6．曹志刚，钱亚生，《现代通信原理》 清华大学出版社 1992．8
7．李见新等 《现代通信系统分析与仿真MATLAB通信工具箱》 西安电子科技大学出版社 2000．11
8．张林让，“自适应阵列处理稳健方法研究”，西安电子科技大学博士学位论文，1999
9．金梁，“基于时空特征结构的阵列信号处理和智能天线技术研究”，西安交通大学博士学位论义，1999
10．诸晓英，“Turbo码及其于多用户检测的联合应用”，西北工业大学硕士学位论文，2002
11. Ruifeng Wang, "Spatial-Temporal signal processing for multi-user CDMA communication systerms", Ph.D dissertation of Queen's University, 1999
12. H.E. Gamal, E.G. Senior, "Iterative multiuser detection for coded CDMA signals in AWGN and fading channels", IEEE Journal on Selected Areas
in Communications, vol. 18, No.1, Jun. 2000．
13． M. Moher, " An iterative multiuser detection for near-capacity communications" ,IEEE Trans. Commun., vol. 46, pp870-880, July 1998
14． Xiaodong Wang and H.Vincent Poor, "Space-time multi-user detection in multipath CDMA channels" , IEEE Trans. Commun, vol. 47, No. 12, pp2356-2374, Sep. 1999
15． John G. Proakis 《Digital Communications》 McGraw-Hill Companies, Inc. 2001