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Adaptive Pilot Signaling in the Uplink of OFDM-Based Wireless Systems

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Authors
Kim, Cheong-Hwan; Lee, Yong-Hwan
Issue Date
2007-07
Citation
16th IST Mobile and Wireless Communications Summit, 2007
Keywords
Adaptive Pilot SignalingUplinkOFDM
Abstract
Orthogonal frequency division multiplexing (OFDM)
has been considered as one of key transmission technologies for
high-speed wireless communication systems. For channel-adaptive
transmission of OFDM signal, base stations transmit a common
pilot signal in the downlink, but mobile stations transmit
individual pilot signal in the uplink. As a consequence, the uplink
may suffer from poorer channel estimation accuracy than the
downlink. This problem can be alleviated by increasing the pilot
signal density. But this reduces the time and frequency resources
for the data transmission, deteriorating the actual transmission
throughput. In this paper, we propose an adaptive pilot signaling
scheme that adjusts the pilot density in response to the change of
channel characteristics. Simulation results show that the proposed
scheme can remarkably reduce the pilot overhead without
performance degradation, compared to conventional schemes.
Language
English
URI
http://www.mobilesummit2007.org

http://hdl.handle.net/10371/7122
DOI
https://doi.org/10.1109/ISTMWC.2007.4299160
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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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