Proposal of sub-optimum algorithm for trellis-based SLM reducing PAPR of FBMC-OQAM signals

Filter bank multi-carrier with offset quadrature amplitude modulation (FBMC-OQAM) has several advantages. FBMC-OQAM is considered a major candidate for the next generation mobile communication systems. The high peak-to-average power ratio (PAPR) is one of disadvantage for FBMC-OQAM signal which could be solved by the Trellis-based SLM (TSLM) technique. This TSLM technique has a much better PAPR reduction performance. However, the trellis-based algorithm has high computational complexity. This paper proposes the sub-optimum algorithm for trellis-based SLM scheme. The proposed algorithm show much lower computational complexity than trellis-based SLM scheme with small degradation of PAPR reduction performance. On the other hand, the PAPR reduction performance of proposed algorithm shows better than conventional SLM with similar computational complexity when the number of L symbols is large. The efficiencies of proposed scheme were verified by using various computer simulations.