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OFDM系统中的时变频偏跟踪算法

Adaptive Time-Varying Frequency Offset Tracking Algorithm for OFDM
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摘要 为了减小载波频率偏差对 OFDM系统的影响 ,提出了一种改进的最小均方自适应算法来进行频偏跟踪 ,并对多种时变频偏的情况进行了计算机仿真 ,得到了跟踪曲线和频偏补偿前后的 BPSK星座图。理论分析和仿真结果表明 ,由于本文的算法收敛速度快 ,对时变频偏的跟踪达到了较好的效果 ,提高了 OFDM系统解调性能 。 To reduce the impact of carrier frequency offset in orthogonal frequency division multiplexing system, this paper proposes a modified least mean square adaptive algorithm and si-mulates the tracking performance of the algorithm for many kinds of time-varying frequency offsets. The tracking curves, MSE, and constellations before and after frequency offset compensation are presented. Theoretical analysis and simulations confirm that the algorithm has good tracking performance because its fast convergence. The algorithm overcomes disadvantages of the non-adaptive method and slowly adaptive algorithm′s difficulty to track time-varying frequency offset.
作者 李鹏怀 徐佩霞
机构地区 中国科学技术大学电子工程与信息科学系
出处 《数据采集与处理》 CSCD 北大核心 2005年第1期1-7,共7页 Journal of Data Acquisition and Processing
关键词 频偏 OFDM系统 跟踪算法 时变 BPSK 载波频率偏差 自适应算法 仿真结果 计算机仿真 行频 orthogonal frequency division multiplexing time-varying frequency offset tracking adaptive filtering binary phase shift keying
分类号 TP391.9 [自动化与计算机技术—计算机应用技术] TN911 [电子电信—通信与信息系统]
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参考文献10

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二级参考文献10

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数据采集与处理
2005年 第1期

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