Frequency symbol spreading based adaptive subcarrier block selection for OFDMA system

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In a wireless network, the signals transmitted from one sender to different users have independent channel fluctuation characteristics. The diversity that exists between users is called multiuser diversity and can be exploited by the sender to enhance the capacity of wireless network. In multiuser diversity OFDMA system, exploiting channel fluctuation diversity is in essence done by selecting the user with the strong subcarrier channels. The individual subcarrier selection for each user can achieve the best system performance but high signaling overhead and high system complexity are required. On the other hand, the adaptive subcarrier block method achieves worse BER than that of individual subcarrier selection. This is because the selected block contains the poor channel subcarriers. To overcome this problem, in this paper, we propose an adaptive subcarrier block selection with frequency symbol spreading for an OFDMA system. (C) 2012 Elsevier Inc. All rights reserved.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2012-05
Language
English
Article Type
Article
Citation

DIGITAL SIGNAL PROCESSING, v.22, no.3, pp.518 - 525

ISSN
1051-2004
DOI
10.1016/j.dsp.2011.08.007
URI
http://hdl.handle.net/10203/103627
Appears in Collection
GT-Journal Papers(저널논문)
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