Outage performance of flexible OFDM schemes in packet-switched transmissions

Romain Couillet (1) , Merouane Debbah (2)

1 NXP Semiconductors
2 E3S - Supélec Sciences des Systèmes

In this paper, alpha-OFDM, a generalization of the OFDM modulation, is proposed. This new modulation enhances the outage capacity performance of bursty communications. The alpha-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 alpha at the symbol rate, alpha-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 multi-antenna and multi-cellular OFDM based standards. Practical simulations, in the context of 3GPP-LTE, called hereafter alpha-LTE, sustain our theoretical claims.

Domains: Computer Science [cs]; Information Theory [cs.IT]; Mathematics [math]; Information Theory [math.IT]

Romain Couillet, Merouane Debbah. Outage performance of flexible OFDM schemes in packet-switched transmissions. EURASIP Journal on Advances in Signal Processing, 2009, Special Issue "Dynamic Spectrum Access for Wireless Networking", 22 p. ⟨hal-00414534⟩