PAPR Reduction in FBMC Systems Using a Smart Gradient-Project Active Constellation Extension Method

NUAN VAN DER NEUT; BODHASWAR TJ MAHARAJ; FREDERICK DE LANGE; GUSTAVO J. GONZÁLEZ; FERNANDO H. GREGORIO; JUAN E. COUSSEAU

Lisboa

Conferencia; International Conference on Telecommunications 2014; 2014

Institute of Electrical and Electronics Engineers (IEEE)

The filter bank multicarrier (FBMC) modulationscheme has recently seen renewed interest and is being consideredas a viable alternative to orthogonal frequency divisionmultiplexing (OFDM). FBMC, however suffers from the samehigh peak-to-average power ratio (PAPR) drawback as OFDMsystems. Conventional OFDM PAPR reduction techniques cannotbe directly applied to FBMC due to the overlapping natureof FBMC symbols. A novel technique is proposed based onan evolution of the smart-gradient project active constellationextension (SGP-ACE) PAPR reduction method used for OFDMsystems, namely the FBMC SGP-ACE method. The proposedmethod is applied to a set of contiguous FBMC symbols, therebycompensating for the overlapping nature of FBMC modulation.The proposed method requires less iterations than a projectiononto-convex-sets (POCS) ACE approach to converge to a lowerPAPR and significant reduction in complexity can be achievedas opposed to current FBMC PAPR reduction techniques whichtend to require the addition of advanced signal processing. Theproposed FBMC SGP-ACE method outperforms a conventionalFBMC POCS-ACE method by 2.6dB in PAPR reduction at a clipprobability of 10-4 on the 1st iteration.