OFDM系统中面向判决的同步与信道联合估计算法

赵丹; 于全; 王建新

doi:10.3724/SP.J.1146.2007.00443

OFDM系统中面向判决的同步与信道联合估计算法

doi: 10.3724/SP.J.1146.2007.00443

赵丹^① 于全,,
于全,
王建新

计量
- 文章访问数: 3651
- HTML全文浏览量: 123
- PDF下载量: 763
- 被引次数: 0
出版历程
- 收稿日期: 2007-03-26
- 修回日期: 2007-08-02
- 刊出日期: 2008-10-19

A Combined Symbol Timing and Frequency Synchronization and Channel Estimation Technique Based on Detected Data for OFDM Systems

Zhao Dan^{① 于全
,},
Yu Quan,
Wang Jian-Xin

摘要

摘要: 该文提出了一种新的面向判决的OFDM时间和载波频率偏差与信道的联合跟踪算法，并给出了开环和闭环两种结构，不同结构适用于不同的信道环境。该算法提取出信道估计结果所包含的同步信息用于实现同步估计，然后利用当前同步估计结果对信道估计结果进行修正，使之尽量逼近真实信道。采用闭环结构并适当地选择块长和反馈因子的取值，该算法可以有效地对时变信道进行跟踪。
- 正交频分复用 /
- 同步 /
- 信道估计 /
- 联合估计 /
- 跟踪
Abstract: A new combined symbol timing and frequency synchronization and channel estimation technique by using the detected data is developed for OFDM systems. Open-loop and closed-loop schemes are described in details. The synchronization information contained in the channel estimated results which is gained by LS channel estimation method is extracted based on the Maximum Likelihood (ML) criterion for synchronization estimation，and then the estimated results of symbol timing and frequency are used to correct the initial estimated channel and make it be more equal to the real channel more. Select appropriate length of the block and the value of feedback factors, the algorithm can be used to tracking the time variable channel.
- O /
- F /
- D /
- M

HTML全文

参考文献(1)

[1] Rugini L and Banelli P. BER of OFDM systems impaired bycarrier frequency offset in multipath fading channels[J].IEEETrans. on Wireless Commun.2005, 4(5):2279-2288 [2] Kapoor S.[J].Marchok D J, and Huang Y F. Pilot assistedsynchronization for wireless OFDM systems over fast timevarying fading channels[C], VTC98, Ottawa, Canada.1998,:- [3] Van de Beek J J, Sandell M, and Borjesson P O. MLestimation of time and frequency offset in OFDM systems[J].IEEE Trans. on Signal Processing.1997, 45(7):1800-1805 [4] Du Y.[J].Zhang X M, and Zhu P C. A signal reconstructionCFO blind tracking algorithm for OFDM system in multipartchannels [C]. P IMRC03. Beijing, P. R. China.2003,:- [5] Julia M, Edfors O, and Paez J M. Frequency offset correctionfor coherent OFDM in wireless systems [J].IEEE Trans. onConsumer Electronics.2001, 47(1):187-193 [6] Speth M, Fechtel S A, Fock G, and Meyr H. Optimumreceiver design for wireless broad-band systems usingOFDM-Part I[J].IEEE Trans. on Commun.1999, 47(11):1668-1677 [7] Shi K, Serpedin E, and Ciblat P. Decision-directed finesynchronization in OFDM systems[J].IEEE Trans. onCommun.2005, 53(3):408-412 [8] Dowler A.[J].Nix A, and McGeehan J. Data-derived iterativechannel estimation with channel tracking for a mobile fourthgeneration wide area OFDM system [C] GLOBECOM03,San Francisco, USA.2003,:- [9] Fechtel S A. OFDM carrier and sampling frequencysynchronization and its performance on stationary andmobile channels[J].IEEE Trans. on Consum. Electron.2000,46(8):438-441 [10] Zhao D and Yu Q. A joint Detected-Directed carrierfrequency offset and channel estimation technique for OFDMsystems[C]. Wireless Communications, Networking andMobile Computing, 2007. WiCom07. Shanghai, P. R. China,21-25 Sept. 2007: 338-341. [11] Schmidl T M and Cox D C. Robust frequency and timingsynchronization for OFDM[J].IEEE Trans. on Commun.1997, 45(12):1613-1621

施引文献

资源附件(0)

访问统计