...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Communications, IEEE Transactions on >A Multiuser Detection Algorithm for Random Access Procedure With the Presence of Carrier Frequency Offsets in LTE Systems
【24h】

A Multiuser Detection Algorithm for Random Access Procedure With the Presence of Carrier Frequency Offsets in LTE Systems

机译：LTE系统中存在载波频率偏移的随机接入过程多用户检测算法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the LTE system, uplink synchronization can be established through the random access channel, by which timing and frequency offsets between transceivers can be estimated and adjusted. As the single carrier frequency division multiple access (SC-FDMA) structure is utilized in LTE uplink, preambles for the random access channel should be generated and detected in the transform-domain at user equipments and the base station, respectively. However, in available literature, an explicit transform-domain signal model with respect to timing and frequency offsets has not been provided, and the impact of frequency offsets on the transform-domain signal is not analyzed either. Therefore, suffering from unknown interference among multiple user equipments, existing multiuser detection algorithms provide unsatisfied multiuser detection and estimation performance. In this paper, an explicit transform-domain signal model is first derived with respect to both timing and frequency offsets. The characteristic of transform-domain frequency offsets is then analyzed, which indicates that transform-domain frequency offsets behave differently with time-domain frequency offsets. After that, a multi-steps hybrid multiuser detection algorithm is proposed to improve the multiuser detection and estimation performance, and the Cramër-Rao bound to the accuracy of parameters estimation for the random access procedure is finally obtained. Simulation results show that the proposed algorithm is able to significantly improve the multiuser detection and estimation performance compared to existing ones.
机译：在LTE系统中，可以通过随机接入信道建立上行链路同步，由此可以估计和调整收发器之间的定时和频率偏移。由于在LTE上行链路中使用了单载波频分多址（SC-FDMA）结构，因此应该分别在用户设备和基站的变换域中生成并检测用于随机接入信道的前同步码。然而，在现有文献中，尚未提供关于定时和频率偏移的明确的变换域信号模型，并且也未分析频率偏移对变换域信号的影响。因此，遭受多个用户设备之间的未知干扰，现有的多用户检测算法提供了不满意的多用户检测和估计性能。在本文中，首先针对时序和频率偏移推导了一个明确的变换域信号模型。然后分析了变换域频率偏移的特性，这表明变换域频率偏移的行为与时域频率偏移不同。在此基础上，提出了一种多步骤混合多用户检测算法，以提高多用户检测和估计性能，最终获得了随机访问过程参数估计精度的Cramër-Rao。仿真结果表明，与现有算法相比，该算法能够显着提高多用户检测和估计性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号