Efficient Adaptive Transmission Technique for Coded Multiuser OFDMA Systems

Duho RHEE
Joong Hyung KWON
Ilmu BYUN
Kwang Soon KIM

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B    No.8    pp.2168-2171
Publication Date: 2007/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.8.2168
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
adaptive transmission,  OFDMA,  partial CQI,  

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Summary: 
In previous literature on adaptive transmission in multiuser OFDMA systems, only uncoded case or capacity (coded with infinite length of codeword) has been considered. In this paper, an adaptive transmission algorithm for coded OFDMA systems with practical codeword lengths is investigated. Also, in order to keep the feedback overhead within a practical range, a two-step partial CQI scheme is adopted, which has both better performance and reduced feedback overhead compared to conventional partial CQI schemes. By allowing a long codeword block across all allocated sub-bands with appropriate power and modulation order allocation rather than using short codeword blocks to each sub-band, high coding gain can be obtained, which leads to performance improvement.