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Efficient subcarrier and bit allocation algorithm for OFDMA system with adaptive modulation

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4 Author(s)
Ho Seok Kim ; Sch. of Electr. Eng., Seoul Nat. Univ., South Korea ; J. S. Kwak ; Jung Min Choi ; Jae Hong Lee

This paper investigates the adaptive subcarrier and bit allocation algorithm for OFDMA systems. To minimize overall transmit power, we propose a novel adaptive subcarrier and bit allocation algorithm based on channel state information, Moreover, the block-wise method is considered based on channel variation for adaptive subcarrier and bit allocation. It is shown that a near optimal solution is obtained by the proposed algorithm which has low complexity compared to that of other conventional algorithms. Also, it is shown that the block-wise method significantly reduces the complexity and the feedback or side information though has a slight transmit power increase.

Published in:

Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th  (Volume:3 )

Date of Conference:

17-19 May 2004