SC-FDMA系统中频域均衡及相关技术的研究

项目名称： SC-FDMA系统中频域均衡及相关技术的研究

项目编号： No.60802010

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 朱宇

作者单位： 复旦大学

项目金额： 18万元

中文摘要： 如何在时变的多径衰落无线信道中提高数据传输速率，增加系统容量是下一代移动通信系统的主要任务和挑战。单载波频分多址接入（SC-FDMA）结合了单载波频域均衡（SC-FDE）和频分多址接入（FDMA）的优点，具有与正交频分多址（OFDMA）相近的频谱利用率和计算复杂度。因为具有比OFDMA 低的发射功率峰均值比特性，SC-FDMA 已经被3GPP-LTE 采纳作为上行接入方案。本课题首先研究了SC-FDMA系统中因载波频偏引起的多用户干扰问题，指出了载波频偏对基于交织式子载波分配模式的SC-IFDMA系统与对基于区域式子载波分配的SC-LFDMA系统的不同性能影响，并且分别对这两种系统提出了不同的联合频域均衡、频偏抵消算法。课题也研究了高性能、相对低复杂度的频域均衡器、混合时频域均衡器的设计。课题还提出了新的基带处理算法来进一步降低SC-FDMA系统中的发送信号功率峰均比。在新一代移动通信系统3GPP-LTE-Advanced最新标准采纳中继技术的背景下，本课题也研究了基于放大转发协议的SC-FDMA中继网络中的资源分配算法，来提高网络数据吞吐量。

中文关键词： 下一代移动通信；单载波频分多址；频域均衡；载波频偏

英文摘要： How to increase the data transmission rate and system capacity in the time-varying multipath wireless channels has been the main task and challenge in the design of next generation mobile communication systems. Single carrier frequency division multiple access (SC-FDMA), which combines the advantages of single carrier frequency domain equalization (SC-FDE) and frequency division multiple access (FDMA), has been shown to have similar spectrum efficiency and computational complexity as orthogonal frequency division multiple access (OFDMA). Due to its lower peak-to-average power ratio (PAPR), SC-FDMA has been adopted as the uplink multiple access method in the 3GPP-LTE standard. In this project, we first investigated the multi-user interference problem due to the carrier frequency offset (CFO) in SC-FDMA systems. Since it was found that the CFO has different effects to the interleaved SC-FDMA (SC-LFDMA) and the localized SC-FDMA (SC-LFDMA) systems, two different classes of algorithms have been proposed to jointly equalize the multipath effect and compensate for the CFO effect. This project also investigated the sophisticated and relatively low-complexity frequency domain equalizer and hybrid frequency-time domain equalizer to mitigate the multipath effect. We also studied the advanced baseband algorithm to further decrease the PAPR in SC-FDMA signals. Finally, under the background that the latest 3GPP LTE-Advanced standard has adopted the relay communication technique, this project investigated the resource allocation algorithm in the relay aided SC-FDMA networks with amplify-and-forward protocol to increase the network throughput.

英文关键词： next generation mobile communications; single carrier frequency division multiple access; frequnecy domain equalization; carrier frequency offsets