Channel estimation for OFDM system using superimposed Chirp training sequences

Computer Engineering and Applications ›› 2011, Vol. 47 ›› Issue (31): 97-100.

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Channel estimation for OFDM system using superimposed Chirp training sequences

LIU Qiuge，MU Xiaomin，LU Yanhui

School of Information Engineering，Zhengzhou University，Zhengzhou 450001，China

Received:1900-01-01 Revised:1900-01-01 Online:2011-11-01 Published:2011-11-01

叠加Chirp训练序列的OFDM信道估计

刘秋格，穆晓敏，陆彦辉

郑州大学信息工程学院，郑州 450001

Abstract

Abstract: It uses the chirp signal as superimposed training sequence added in time domain in OFDM system.At the receiver，it applies the time-domain average and frequency-domain average to estimate the channel respectively.It makes researches on the influence to the Peak to Average Ratio（PAR） and the performance which is caused by the power ratio of the superimposed training sequence to the data sequence.Besides，it compares the performance of the time-domain average and frequency-
domain average.Simulation results show that it can not only decrease the PAR but also derive different estimation performance and system performance with different power using the chirp signal.Furthermore，the results show that the time-
domain average has higher data power and better estimation performance.

Key words: Orthogonal Frequency Division Multiplexing（OFDM）, channel estimation, superimposed training sequence

摘要： 在OFDM系统中，以Chirp信号为训练序列，在时域上与数据符号进行叠加，接收端分别利用时域平均法和频域平均法估计信道。具体研究了叠加训练序列与数据序列功率比对峰均比及系统性能的影响，并在同一功率比下比较了时域平均法和频域平均法的性能。仿真结果表明叠加Chirp信号有效地降低了系统的峰均比，且不同功率比造成不同的估计性能和系统性能;同时，时域平均法相对于频域平均法有更高的功率利用率和更好的估计性能。

关键词: 正交频分复用技术, 信道估计, 叠加训练序列

LIU Qiuge，MU Xiaomin，LU Yanhui. Channel estimation for OFDM system using superimposed Chirp training sequences[J]. Computer Engineering and Applications, 2011, 47(31): 97-100.

刘秋格，穆晓敏，陆彦辉. 叠加Chirp训练序列的OFDM信道估计[J]. 计算机工程与应用, 2011, 47(31): 97-100.

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Channel estimation for OFDM system using superimposed Chirp training sequences

叠加Chirp训练序列的OFDM信道估计

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