A fast subcarrier, bit, and power allocation algorithm for multiuser OFDM-based systems

Yung Fang Chen, Jean Wei Chen

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

In this paper, we propose a real-time subcarrier, bit, and power allocation algorithm for orthogonal frequency-division multiplexing-based multiuser communication systems in downlink transmission. Assuming that base stations know the channel gains of all subcarriers of all users, the proposed loading algorithm tries to minimize the required transmit power while satisfying the rate requirement and data error rate constraint of each user. The novel algorithm simultaneously determines subcarrier, bit, and power allocation by enhancing the suboptimal algorithm by Wong et al while having the same computational complexity. The proposed scheme offers better performance in terms of transmit power than that of Wong et al, as demonstrated in the simulation results, whereas the performance of the scheme in Wong et al was close to that of the optimal solution.

Original languageEnglish
Pages (from-to)873-881
Number of pages9
JournalIEEE Transactions on Vehicular Technology
Volume57
Issue number2
DOIs
StatePublished - Mar 2008

Keywords

  • Bit loading
  • Multiuser orthogonal frequency-division multiplexing (OFDM)
  • Subcarrier allocation

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