基于准正交互补序列集的高容量多载波CDMA多址接入技术研究

项目名称： 基于准正交互补序列集的高容量多载波CDMA多址接入技术研究

项目编号： No.60872014

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 轻工业、手工业

项目作者： 郝莉

作者单位： 西南交通大学

项目金额： 28万元

中文摘要： 本课题以无线蜂窝系统中多址接入的干扰抑制和性能提升为目标，以扩频序列设计为基础，以预编码和信号处理为手段，展开了如下几个方面的研究工作并取得重要成果：1)以提高系统容量和性能为目标，开展新型扩频序列构造及其在扩频通信系统中的应用研究，建立起以互补序列集为基础的多址编码性能分析与构造理论,同时提出了新型的扩频多址技术对抗频率选择性衰落和用户间干扰，给出的分析与仿真结果表明方案优于现有研究成果；2)针对蜂窝系统中的多用户、多中继和多基站组网，特别在引入多天线情况下从干扰抑制角度出发，提出了基于预编码、自相关相关多址技术等的多址方案，有效抑制了系统中存在各种干扰从而提升了中心用户以及边缘用户吞吐性能，进一步通过调度算法实现多址接入，提高系统容量和性能；3)针对构造序列特性、新型多址技术性能等展开分析，同时得到了多用户检测的CDMA随机接入系统的多址接入干扰和性能分析结果。课题所取得成果可以为下一代移动通信系统中的多址方案设计、导频序列与同步序列设计、预编码与检测方案设计等提供参考。

中文关键词： 多址接入；扩频序列；互补序列；干扰；预编码

英文摘要： Aiming at the interference suppression and performance improvement of multiple-access technology in wireless cellular communication systems, the project performs research work on the basis of spreading sequence design and specturm-spreading scheme by means of pre-coding and signal processing. The main contents of the project involve: 1) Researches on design and applications of new spreading sequences in spectrum spreading systems are conducted to build the complementary-sequence-based analysis and construction theory framework of multiple-access coding. Meanwhile, novel spectrum-spreading multiple-access techniques are proposed to deal with the frequency-selective fading and multiple-user access. The analysis and simulation results show that the proposed schemes outperform the current researches. 2) For the multiple-user, multiple-relay and multiple-basestation networks, especially with the emphasis on multiple-antenna scenario, the multiple-access schemes based on precoding and auto-correlation multiple access techniques are proposed to suppress the interference existing in the system to improve the throughput performance of center and edge users. Moreover, scheduling is designed to improve the system capacity and performance. 3) Analysis on sequence characteristics, technique performance are performed, together with which, the analysis results of interference and performance in CDMA random-access system are obtained. In conclusion, the fruits obtained through the research of this project can provide references for the design of multiple-access scheme, construction of pilot and synchronous sequence, design of precoder and detector in next generation mobile communications.

英文关键词： multiple-access;spreading sequence; complementary sequences;interference;precoding