Low-complexity approximate LMMSE channel estimation for OFDM systems

Low-complexity approximate LMMSE channel estimation for OFDM systems
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发表时间：
2012-12
期刊：
Proceedings of The 2012 Asia Pacific Signal and Information Processing Association Annual Summit and Conference
影响因子：
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通讯作者：
S. Ohno;Shogo Munesada;Emmanuel C. Manasseh
S. Ohno;Shogo Munesada;Emmanuel C. Manasseh
中科院分区：
其他
文献类型：
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作者：
S. Ohno;Shogo Munesada;Emmanuel C. Manasseh

文献摘要

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针对频率选择性信道上的正交频分复用（OFDM）系统，提出了一种基于低复杂度线性最小均方误差（LMMSE）的信道估计器。利用大数定律，我们对LMMSE估计器进行近似，以降低信道估计的数值复杂度。我们的估计器在低信噪比下表现出与LMMSE估计器相当的性能，但由于近似会出现性能下限，数值模拟验证了这一点。
A low-complexity linear minimum mean square error (LMMSE) based channel estimator is proposed for orthogonal frequency-division multiplexing (OFDM) systems over frequency-selective channels. Using the law of a large number, we approximate the LMMSE estimator to reduce the numerical complexity of the channel estimation. Our estimator exhibits comparable performance with the LMMSE estimator at low SNR but suffers the performance floor due to the approximation, which are verified by numerical simulations.