快速移动环境下多天线-网格正交频分复用系统信号优化与处理方法研究

项目名称： 快速移动环境下多天线-网格正交频分复用系统信号优化与处理方法研究

项目编号： No.61201242

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 袁志钢

作者单位： 中国人民解放军理工大学

项目金额： 25万元

中文摘要： 如何有效增强通信链路在快速移动场景下的传输能力是目前无线通信领域亟待研究的重点问题。虽然多天线正交频分复用MIMO-OFDM优势地位明显，但在快速移动条件下OFDM对时变信道敏感的固有缺陷将导致系统传输效率成倍下降。网格正交频分复用LOFDM的出现不仅印证了性能提升的可能性(中强散射信道下其邻道串扰抑制水平可较前者提高近10dB)，同时也开辟了有效的途径。但所有这些都是以其特有的网格结构为基础、以增加子信号关联程度为代价换取的，在MIMO与LOFDM结合时，最突出的影响就是：在快时变信道下以往极端的"长符号干扰现象"将变得极其平常，并使得接收端的处理难度变得不可控。 结合快时变无线信道及MIMO-LOFDM自身的特殊性，本项目拟研究下述关键问题：1）多目标约束下的最佳信号设计，使符号关联长度得以有效控制；2）研究自适应接收机设计和存在长符号干扰下低复杂度检测方法，以提供一般的依据和方法。

中文关键词： 网格正交频分复用；多载波并行传输技术；时变多径信道；信号设计；接收处理

英文摘要： Nowadays, the common concern about how to efficiently enhance the data rate of wireless link access in fast-mobile environments is igniting intense world-wide interests. For the key candidate, known as MIMO-OFDM, its leading role on high-rate transmissions is significantly challenged by its natural sensitivity to time-varying channel conditions, while a new shaping technique, called LOFDM, attracts more interest for its potentials in co-channel interference resistance with about 10 dB performance enhancement. And a new shaping technique, called LOFDM, pave the new way for its development and has been igniting wide interest for its outstanding performance in co-channel interference resistance with about 10 dB gains. However, all this that is based on lattice-type signal structure is bought at the price of tight relations between sub-branches. One critical impact on the combination "MIMO-LOFDM" under time-varying multipath channels is the fountain of the long-symbol interference, a phenomenon that is extremely unusual will make the receiver out of run with gigantic computations. In this project, the following issues will be discussed: 1) multi-objective signaling for symbol conjunction length control; 2) adaptive receiver with low complexity reliable symbol recovery under long symbol interferences. More theoretic

英文关键词： Lattice OFDM；Multicarrier Transmission Technologies；Time-varying Multipath Channels；Signal Design；Signal Receiving and Processing