Channel Estimation Techniques for MIMO-OFDM Systems over Frequency Selective Fading Channels

Year 2016, Special Issue (2016), 33 - 36, 01.12.2016

Seda Üstün Ercan

https://doi.org/10.18100/ijamec.270714

Cited By: 1

Abstract

Wireless channel is very complex because of  both frequency and time selectivity. In order
to overcome the adverse effects of multipath fading in mobile communication
channels, channel estimation must be performed. 
There are three kinds of channel estimation methods: pilot based, blind
and semi-blind. In pilot based channel estimation, some of data symbols are
used to estimate channel. In blind channel estimation statistical properties of
channel are used. In semi-blind channel estimation information from both data
symbols and statistical properties is utilized. In this study, pilot based and
semi-blind channel estimation are used to estimate the channels with various
frequency selectivity in multiple input multiple output-orthogonal frequency
division multiplexing (MIMO-OFDM) systems. Semi-blind channel estimation is
done by using independent component analysis (ICA). Simulation results show
that if the frequency selectivity of the channel is high, semi-blind channel
estimation technique can be used instead of pilot based channel estimation. Thus
with a using a small number of pilot bits, more data can be used in the MIMO
systems.

Keywords

MIMO-OFDM, pilot based, semi-blind, channel estimation, ICA

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