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  • Research Article
  • Open Access

Outage Performance of Flexible OFDM Schemes in Packet-Switched Transmissions

EURASIP Journal on Advances in Signal Processing20092009:698417

  • Received: 30 January 2009
  • Accepted: 7 August 2009
  • Published:


α-OFDM, a generalization of the OFDM modulation, is proposed. This new modulation enhances the outage capacity performance of bursty communications. The α-OFDM scheme is easily implementable as it only requires an additional time symbol rotation after the IDFT stage and a subsequent phase rotation of the cyclic prefix. The physical effect of the induced rotation is to slide the DFT window over the frequency spectrum. When successively used with different angles α at the symbol rate, α-OFDM provides frequency diversity in block fading channels. Interestingly, simulation results show a substantial gain in terms of outage capacity and outage BER in comparison with classical OFDM modulation schemes. The framework is extended to multiantenna and multicellular OFDM-based standards. Practical simulations, in the context of 3GPP-LTE, called hereafter α-LTE, sustain our theoretical claims.


  • Prefix
  • Fading Channel
  • Modulation Scheme
  • Cyclic Prefix
  • Capacity Performance

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Authors’ Affiliations

Algorithm Group, ST-Ericsson, 635 Route des Lucioles, 06560 Sophia-Antipolis, France
Department of Telecommunication, Alcatel Lucent Chair on Flexible Radio, Supélec, 3 rue Joliot Curie, 91192 Gif sur Yvette, France