An optimized prototype filter for OFDM/OQAM system

摘要

Most of the researches in recent years have been focused on a new multicarrier system OFDM/OQAM, which is different from the traditional OFDM based on cyclic prefix (CP). Using offset QAM modulation, the new system ensures high channel utilization without CP. In the modulated and demodulated process of OFDM/OQAM, the signals must through pulse shaping using prototype filters, so an appropriate filter is particularly important. In this paper, an optimized filter based on Zak transformation is proposed, which has better time-frequency localization (TFL). The experimental simulation proved that new system can resist the effects of multipath fading and Doppler spread effectively, thus having better BER performance.