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Effect of channel estimation error on packet-based multi-user OFDM systems

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Authors
Jeon, Jae-Hoon; Lee, Yong-Hwan
Issue Date
2005-07
Publisher
Institute of Electronics Engineers of Korea = 대한전자공학회
Citation
대한전자공학회 하계종합학술대회, 2005년 7월
Keywords
channel estimationmulti-user OFDM systems
Abstract
In this paper, we consider the performance of a packetbased
multi-user orthogonal frequency division multiplexing
(OFDM) wireless system in the presence of channel estimation
error. To investigate the effect of incorrect channel information
on the system performance, we consider the use of two channel
estimation schemes; one is a simple linear and the other is an
optimum Wiener-type channel estimator. We analyze the effect
of channel impulse response (CIR) estimation error on coherent
reception and the effect of instantaneous signal to interference
and noise ratio (SINR) estimation error on channel aware
techniques associated with packet scheduling. It is shown that
the performance of coherent reception is relatively less
susceptible to the CIR error, but the performance of channel
aware schemes can be very sensitive to the SINR estimation
error, mainly due to incorrect scheduling. To alleviate this
scheduling problem, we propose an improved scheduling
method which can be employed even with the use of a simple
channel estimator. Finally, we verify the performance of the
proposed scheduling scheme by computer simulation.
Language
English
URI
http://hdl.handle.net/10371/7073
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Others_전기·정보공학부
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