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OFDM系统中快速频偏估计 被引量：4

Fast Frequency Offset Estimation in OFDM System
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摘要 提出了正交频分复用(OFDM)系统中一种新的载波频偏估计算法.载波频偏估计过程可分为获取和跟踪,其中,获取过程和时间同步是同时完成的.新算法可实现的最大载波频偏获取范围是整个信号带宽的一半.新的跟踪算法是一个最大似然算法,在加性白噪声高斯信道(AWGN)下,当N(训练序列长度的一半)等于128时,其性能比Schmidl算法提高约7.27dB;在多经信道下,当信噪比不是很高时,新算法仍具有优势. A new carrier frequency offset estimation scheme in orthogonal frequency division multiplexing (OFDM) system is proposed. The carrier frequency offset estimation includes acquisition and tracking, and acquisition as well as timing synchronization can be performed simultaneously with high accuracy. The maximum acquisition range can be up to one half of overall signal bandwidth. The proposed tracking estimator is a maximum-likelihood estimator, and in AWGN channel, about 7.27 dB improvement is obtained compared to the Schmidl's algorithm when N=128; in multipath channel, the proposed algorithm works well at moderate SNR.
作者 张中山 刘晓明 赵明 刘元安 高锦春
机构地区 北京邮电大学无线通信中心
出处 《北京邮电大学学报》 EI CAS CSCD 北大核心 2004年第5期41-44,55,共5页 Journal of Beijing University of Posts and Telecommunications
基金 国家"863计划"项目(2003AA12331004)
关键词 频偏估计 多径信道 正交频分复用 Algorithms Computer simulation Maximum likelihood estimation Multipath propagation
分类号 TN911.7 [电子电信—通信与信息系统]
  • 相关文献

参考文献7

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二级参考文献3

  • 1[1]Van de Beek J J.ML estimation of time and frequency offset in OFDM systems[J].IEEE Transactions on Signal Processing,1997,45(7):1 800-1 805.
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共引文献15

同被引文献12

  • 1LIU Xiao-ming LIU Yuan-an.Improved Carrier Frequency Offset Estimation in OFDM Systems[J].The Journal of China Universities of Posts and Telecommunications,2004,11(z1):33-36. 被引量：2
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  • 8Morelli M. Timing and frequency synchronization for the uplink of an OFDMA system[J]. IEEE Transactions on Communications, 2004, 52(2): 296-306.
  • 9Cao Zhongren, Turell U, Yao Yudong. Analysis of two receiver schemes for interleaved OFDMA uplink [C] // Conference Record of the Thirty-Sixth Asilomar Conference on Systems and Computer. California: [s. n.], 2002: 1818-1821.
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引证文献4

二级引证文献5

北京邮电大学学报
2004年 第5期

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