小波去噪结合信道估计在OFDM系统中的应用

山东大学学报(工学版)

小波去噪结合信道估计在OFDM系统中的应用

孙君¹，袁东风^1,2

1．山东大学信息科学与工程学院，山东济南250100；2．东南大学移动通信国家重点实验室，江苏南京210096

收稿日期:2005-11-01 修回日期:1900-01-01 出版日期:2006-04-24 发布日期:2006-04-24
通讯作者: 孙君

Application of wavelet de-noising combined with channel

SUN Jun¹，YUAN Dong-feng^1,2

1.School of Information Science and Engineering,Shandong University,Jinan 250100,China;2. State Key Lab.On Mobile Communication,Southeast University,Nanjing 210096,China

Received:2005-11-01 Revised:1900-01-01 Online:2006-04-24 Published:2006-04-24
Contact: SUN Jun

摘要/Abstract

摘要： 在正交频分复用（OFDM: Orthogonal Frequency Division Multiplexing）系统中，我们通常从频率域的角度估计信道衰落因子.在频率域，发射的信号在经历了乘性衰落的同时还经历了加性的噪声的干扰.不论我们采用哪种方法来估计乘性的衰落因子，加性噪声的干扰始终存在，从而影响了估计的质量.将小波去噪用于信道估计中以去除其中的加性干扰，从而在不增加复杂度的前提下，提高了信道估计的准确度，进而提高了整个系统的性能.同时证明了该方法适用于不同的信道环境（频率选择性衰落信道、平坦衰落信道、快衰落和慢衰落信道）.

关键词: 小波去噪, 信道估计, OFDM

Abstract: We usually estimate the channel attenuation factor in the frequency domain in OFDM systems. The values of the estimated channel coefficients are composed of the multiplicative fading which is needed, and the additive fading which is negative to the quality of the estimation. Wavelet denoising is used to impair the negative effect. It has been validated that the method improved the system performance without increasing complexity. Then we also verify the robustness of the new method with different channels.

Key words: channel estimation method, OFDM , wavelet denoising

中图分类号:

TN911

孙君,袁东风, . 小波去噪结合信道估计在OFDM系统中的应用[J]. 山东大学学报(工学版), 2006, 36(2): 104-106 .

SUN Jun,YUAN Dong-feng, . Application of wavelet de-noising combined with channel[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2006, 36(2): 104-106 .

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