Recursive Channel Estimation Method for OFDM-Based Cooperative Systems
Recursive Channel Estimation Method for OFDM-Based Cooperative Systems
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DOI：
10.1109/lcomm.2010.100810.101441
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
Moon-Gun Song;Dongsik Kim;G. Im
中科院分区：
文献类型：
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作者：
Moon-Gun Song;Dongsik Kim;G. Im
在这封信中，我们提出了一种递归信道估计方案，用于正交频分复用（OFDM）在放大和转发（AF）中继信道上。在导频符号辅助信道估计技术中，线性插值被认为是一种简单实用的方法。然而，由于级联信道的严重频率选择性，源-中继-目标信道的线性插值可能不能很好地工作。具体来说，边缘子载波的外推会严重扭曲信道估计性能。为了减轻外推的不利影响，我们将边缘子载波的信道估计部分为零。该方法有效地减少了由于信道估计不准确而导致的误差传播。此外，我们设计了一种低复杂度的递归线性插值方案，其中每个更新过程都利用了反馈信息的可靠性和线性插值的特性。
In this letter, we propose a recursive channel estimation scheme for orthogonal frequency division multiplexing (OFDM) over amplify-and-forward (AF) relaying channels. Among pilot-symbol aided channel estimation techniques, linear interpolation is considered to be a simple and practical method. However, linear interpolation for the source-relay-destination channel may not work well due to the severe frequency selectivity of the cascaded channels. Specifically, extrapolation for edge subcarriers significantly distorts the channel estimation performance. To mitigate the detrimental effects of extrapolation, we partially null the channel estimates at the edge subcarriers. The proposed method effectively reduces the error propagation due to inaccurate channel estimates. In addition, we design a low complexity recursive linear interpolation scheme in which each update process utilizes both the reliability of feedback information and the characteristics of linear interpolation.