Optimum Pulse Shaping for OFDM/BFDM Systems Operating in Time Varying Multi-Path Channels

— In this paper, we consider a pulse shaping OFDM/BFDM system operating over doubly dispersive channel. We propose to search the optimal pulse maximizing the signal to interference ratio (SIR). We show that the impact of interference, composed by both inter-symbol interference (ISI) and intercarrier interference (ICI), occurring in such a system, depends crucially on time frequency localization of transmit and receive pulses. We propose to maximize the SIR, written as a ratio of two quaternary forms, by altering between transmit and receive pulse spaces both generated by Hermite Waveforms. Numerical results show that optimized BFDM systems can outperform conventional OFDM systems with respect to SIR. In fact, biorthogonality offers more freedom to design pulses improving robustness of the multicarrier system against channel dispersion.

• Type: Conference
• Year: 2007
• Where: GLOBECOM
• Authors: Imene Trigui, Mohamed Siala, Sofiène Affes, Alex Stephenne, Hatem Boujemaa
• Keywords: GLOBECOM 2007, Intercarrier Interference, Interference Ratio, Pulse Shaping, Telecommunications