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Efficient Channel Estimation Techniques for Amplify and Forward Relaying Systems

机译:放大和正向中继系统的有效信道估计技术

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摘要

In this paper, we present a channel estimation scheme for Amplify-and-Forward (AF) relaying systems, using measurements at the destination only. A Least-Squares (LS) based channel estimation algorithm is developed, that provides the destination with full knowledge of all channel responses involved in the transmission. To investigate the algorithm performance, the Cramer-Rao lower bound (CRB) is analytically computed and compared with the asymptotic covariance of the proposed estimator. Since the existing estimator does not reach the CRB, we also propose and analyze an improved algorithm by taking into account the noise characteristics via weighted LS (WLS). The improved algorithm is asymptotically efficient, since it attains the CRB as the SNR tends to infinity.
机译:在本文中,我们提出了仅在目的地使用测量值的转发转发(AF)中继系统的信道估计方案。开发了基于最小二乘(LS)的信道估计算法,该算法可为目的地提供与传输中涉及的所有信道响应有关的全部知识。为了研究算法的性能,对Cramer-Rao下界(CRB)进行了分析计算,并将其与提出的估计器的渐近协方差进行比较。由于现有的估算器未达到CRB,因此我们还通过考虑加权LS(WLS)的噪声特征,提出并分析了一种改进的算法。改进的算法渐近有效,因为它随着SNR趋于无穷大而获得了CRB。

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