宜春学院学报
宜春學院學報
의춘학원학보
JOURNAL OF YICHUN UNIVERSITY
2012年
4期
10-12
,共3页
离散傅里叶变换%信道估计%插值%维纳滤波
離散傅裏葉變換%信道估計%插值%維納濾波
리산부리협변환%신도고계%삽치%유납려파
DFT%channel estimation%interpolation%wiener filter.
在采用导频的正交频分复用(OFDM)系统中,常采用离散傅里叶变换(DFT)插值的方法来实现信道估计。针对DFT算法中虚子载波的缺失而导致冲激响应有频谱泄漏的现象,对DFT算法进行了两种改进,一是采用维纳滤波插入法重建虚子载波的信道信息,二是通过优化有效导频的LS信道估计来减小噪声的影响,并提高系统的性能。通过仿真证明,改进算法明显优于传统DFT算法。
在採用導頻的正交頻分複用(OFDM)繫統中,常採用離散傅裏葉變換(DFT)插值的方法來實現信道估計。針對DFT算法中虛子載波的缺失而導緻遲激響應有頻譜洩漏的現象,對DFT算法進行瞭兩種改進,一是採用維納濾波插入法重建虛子載波的信道信息,二是通過優化有效導頻的LS信道估計來減小譟聲的影響,併提高繫統的性能。通過倣真證明,改進算法明顯優于傳統DFT算法。
재채용도빈적정교빈분복용(OFDM)계통중,상채용리산부리협변환(DFT)삽치적방법래실현신도고계。침대DFT산법중허자재파적결실이도치충격향응유빈보설루적현상,대DFT산법진행료량충개진,일시채용유납려파삽입법중건허자재파적신도신식,이시통과우화유효도빈적LS신도고계래감소조성적영향,병제고계통적성능。통과방진증명,개진산법명현우우전통DFT산법。
The DFT interpolation is an usual channel estimation for OFDM systems.On the basis of DFT,two algorithms was proposed for interpolation.One is based on Wiener filter through rebuilding channel information of virtual carriers;the other is based on optimizing Least-Square(LS) channel estimation.As compared with the DFT interpolation,the simulations showed that the proposed interpolator has better performance of MSE and it provides a performance similar to the MMSE channel estimation with significantly much lower computational complexity.