Flexible OFDM schemes for bursty transmissions

  • Authors:
  • Romain Couillet;Mérouane Debbah

  • Affiliations:
  • ST-NXP Wireless, Supélec, Sophia Antipolis, France;Alcatel-Lucent Chair, Supélec, Gif sur Yvette, France

  • Venue:
  • WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
  • Year:
  • 2009

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In this paper, α-OFDM, a generalization of the OFDM modulation, is proposed to enhance the outage capacity of bursty transmissions. This new flexible modulation scheme is easily implemented and only requires a symbol rotation of angle α after the IDFT stage. The induced rotation slides the DFT window and provides frequency diversity in block fading channels. Interestingly, the results show a substantial gain in terms of outage capacity and BER in comparison with classical OFDM modulation schemes. The framework is extended to multiuser/multi-antenna OFDM based standards. Simulations, in the context of 3GPP LTE, called hereafter α-LTE, sustain our theoretical claims.