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小波去噪结合信道估计在OFDM系统中的应用 被引量:1

Application of wavelet de-noising combined with channel estimation for OFDM systems
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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). 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.
作者 孙君 袁东风
出处 《山东大学学报(工学版)》 CAS 2006年第2期104-106,116,共4页 Journal of Shandong University(Engineering Science)
基金 国家自然科学基金项目(No.60372030) 国家留学回国基金项目(No.教外司留[2003]406) 山东省自然科学基金重点项目(No.Z2003G02) 教育部移动通信国家重点实验室开放基金项目(No.A2005010) 教育部综合业务网理论与关键技术国家重点实验室开放基金项目(No.ISN7-05)
关键词 小波去噪 信道估计 OFDM wavelet de-noising channel estimation method OFDM
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参考文献10

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