[OFDM信道估计]CHANNEL ESTIMATION FOR OFDM

feaven

CHANNEL ESTIMATION FOR OFDM

MEHMET KEMAL OZDEMIR, LOGUS BROADBANDWIRELESS SOLUTIONS, INC. AND HUSEYIN ARSLAN, UNIVERSITY OF SOUTH FLORIDA

ABSTRACT
Orthogonal frequency division multiplexing (OFDM) is a special case of
multi-carrier transmission and it can accommodate high data rate requirement
of multimedia based wireless systems. Since channel estimation is an
integral part of OFDM systems, it is critical to understand the basis of
channel estimation techniques for OFDM systems so that the most appropriate
method can be applied. In this article, an extensive overview of channel
estimation techniques employed in OFDM systems are presented. In
addition, the advantages, drawbacks, and relationship of these estimation
techniques with each other are analyzed and discussed. As the combination
of multiple input multiple output (MIMO)-OFDM systems promises higher
data rates, estimation techniques are further investigated for these systems.
Although the existing proposed techniques differ in terms of computational
complexity and their mean squared error (MSE) performance, it has been
observed that many channel estimation techniques are indeed a subset of
LMMSE channel estimation technique. Hence, based on a given system’s
resources and specifications, a suitable method among the presented techniques

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preben

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