无线异步双向中继通信系统中的协作分布式编码技术研究

项目名称： 无线异步双向中继通信系统中的协作分布式编码技术研究

项目编号： No.61271231

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 都思丹

作者单位： 南京大学

项目金额： 70万元

中文摘要： 无线双向协作网络能够利用多个中继节点在两个通信节点之间相互传输信息,是未来4G时代重要的无线通信技术,有重要的应用前景。本项目拟研究其三个关键点，首先，由于不同的中继节点有着不同的位置和振荡器，协作系统不可避免的产生信号异步传输等问题，本项目拟建立双向中继传输网络模型，利用OFDM协作技术解决多个中继节点之间的时间误差和频率偏移问题，并克服载波间频率偏移引起的载波干扰问题；其次，中继节点的能量分配方案直接影响到协作系统的性能，研究节点能量分配方案、提高系统能源效率，使其在有限的能量消耗下获得最优性能为项目第二个内容；最后，为了获取协作系统的最大分集和编码增益，本项目将提出一种全新的协作分布式空时编码，其性能在同类主流编码中达到最优，同时又能大幅降低解码复杂度。本项目的研究内容，不仅为分布式编码方法的研究提供一条有效途径，同时也会推动无线中继网络理论及应用技术研究的发展。

中文关键词： 协作通信；分布式时空编码；多载波频偏；格基规约；满分集

英文摘要： It is well known that the multiple relay nodes can assist to transmit the information signals between two communication terminals in wireless two-way relay networks, which are important wireless communication technique for the future fourth-generation (4G) age and have wide application prospects. However, it was found that the data asynchronous transmission is inevitably occuring in the cooperative system because the different relay nodes at in dirrerent locations and have their own oscillators. Therefore, in this project we will build the transmission model of wireless relay network. To combat the time errors and frequency offsets at the relay nodes, orthogonal frequency-division multiplexing (OFDM)-based cooperative transmission technique is exploited. Besides, carrier frequency offset (CFO) may destroby the orthogonality of the subcarriers and result in inter carrier interference (ICI) in asynchronous cooperative OFDM transmissions, which will have to be overcomed. In addition, it is important to analytically find the relay power allocation that minimizes an upper bound on the pairwise error probability (PEP), which can improve performance of cooperative system. In order to achieve full diversity and maximum coding gain in cooperative system, we will propose novel distributed space-time block codes. In fact,

英文关键词： Cooperative communication；distributed space-frequency block code；multiple carrier frequency offsets；lattice Reduction；full diversity