{"title":"Channel Estimator with Time Spread Tracking for OFDM systems","authors":"Zhigang Zhou, Xiaodong Zhang","doi":"10.1109/ICICS.2005.1689249","DOIUrl":null,"url":null,"abstract":"An improved channel estimator with time delay tracking measurement for OFDM systems is proposed by exploiting the inherent correlation between the cyclic prefix and port of the received OFDM signal. This scheme make use of real time measured size of inter-symbol interference (ISI) free window to estimate the maximum delay spread of channel, then a transform domain channel estimator is adopted to further reduce the noise variance. Due to the ISI-free window can be estimated before the application of FFT to the received signal, it is a parallel processing, and very suitable for the practical systems. Simulation result demonstrated that the proposed method can track the variation of delay spread of wireless channel, and improve the MSE of channel estimation significantly, thus give at least 1-dB improvement in ITU PA3 channel and 0.5-dB in ITU PB3 channel","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"53 22 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2005 5th International Conference on Information Communications & Signal Processing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICICS.2005.1689249","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
An improved channel estimator with time delay tracking measurement for OFDM systems is proposed by exploiting the inherent correlation between the cyclic prefix and port of the received OFDM signal. This scheme make use of real time measured size of inter-symbol interference (ISI) free window to estimate the maximum delay spread of channel, then a transform domain channel estimator is adopted to further reduce the noise variance. Due to the ISI-free window can be estimated before the application of FFT to the received signal, it is a parallel processing, and very suitable for the practical systems. Simulation result demonstrated that the proposed method can track the variation of delay spread of wireless channel, and improve the MSE of channel estimation significantly, thus give at least 1-dB improvement in ITU PA3 channel and 0.5-dB in ITU PB3 channel
利用接收OFDM信号的循环前缀和端口之间的固有相关性，提出了一种改进的OFDM信道估计器。该方案利用实时测量的无码间干扰(ISI)窗口的大小来估计信道的最大延迟扩展，然后采用变换域信道估计器进一步减小噪声方差。由于在FFT应用于接收信号之前可以估计出无is窗口，因此它是一种并行处理，非常适合于实际系统。仿真结果表明，该方法能够跟踪无线信道的延迟扩展变化，显著提高信道估计的MSE，在ITU PA3信道中至少提高1 db，在ITU PB3信道中至少提高0.5 db
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