| 多用户OFDM系统的测距定时同步算法 |
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| 引用本文： | 杜梦杰,宋志群,徐信.多用户OFDM系统的测距定时同步算法[J].无线电工程,2009,39(3). |
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| 作者姓名： | 杜梦杰 宋志群 徐信 |
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| 作者单位： | 1. 中国电子科技集团公司第五十四研究所,河北,石家庄,050081
2. 中国电子科技集团公司第五十四研究所,河北,石家庄,050081;解放军理工大学,通信工程学院,江苏,南京,210007 |
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| 摘 要： | 在OFDMA系统中,上行链路的定时误差主要来自远近效应,导致用户间符号到达时刻不一致,因此,同步过程主要依靠测距来完成同步参数估计,再通过反馈机制予以调整。通过对OFDMA几种测距定时同步算法的研究,仿真分析了各自性能及运算复杂度,并在此基础上提出了一种联合同步方案,将3种算法结合应用于不同用户量的接入环境,以满足性能及复杂度的平衡需求。
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| 关 键 词： | 多用户OFDM 测距 时域定时同步 频域差分互相关 时域补偿频域互相关 |
Ranging Timing Synchronization Algorithms of Multi-User OFDM System |
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| DU Meng-jie,SONG Zhi-qun,XU Xin.Ranging Timing Synchronization Algorithms of Multi-User OFDM System[J].Radio Engineering of China,2009,39(3). |
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| Authors: | DU Meng-jie SONG Zhi-qun XU Xin |
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| Abstract: | In the Orthogonal Frequency Division Multiple Access(OFDMA)systems,as the near/far problems bring on the differences of user signals arrival time,the uplink timing mainly achieves the synchronous parameter estimation by the ranging process,while make adjustment through the feedback mechanism.Through the research of several ranging timing synchronization algorithms,we perform simulations and analysis for the performance and operation complexity respectively.Also,an united-synchronization scheme is proposed as combining the three methods,which will be applied to different access environments of multiuser capacity,to satisfy the balance requirement of performance and complexity. |
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| Keywords: | multi-user OFDM ranging time domain timing synchronization frequency domain differential cross-correlation timing phase compensated frequency domain cross-correlation |
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