An improved multicarrier based waveform design for cognitive radio communication

Abstract

Compared to the CP-OFDM, filter bank based multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) is more suitable for cognitive radio scenarios by using synthesis and analysis filter banks with well time-frequency location(TFL) property. Being a favorable candidate physical waveform for the cognitive radio system, FBMC/OQAM has attracted much attention. However, real orthogonality instead of complex orthogonality makes the combination of MIMO and FBMC/OQAM system challenging. In this paper, the implemention issues of the FBMC/OQAM system is researched. Considering various prototype filters used, a weighted signal-to-leakage-and-noise ratio (WSLNR) based precoding method is proposed to mitigate intrinsic interference, the simulation results show that the proposed method is more robust to the channel frequency selectivity compared to the others. The spectral comparison for the prototype filters of the FBMC/OQAM and the CP-OFDM recommends the consideration of FBMC/OQAM in the future CR systems.