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Filter bank multicarrier with offset quadrature amplitude modulation(FBMC-OQAM) is an alternative to OFDM for enhanced spectrum flexible usage. Toreduce the peak-to-average power ratio (PAPR), DFT spreading is usually adoptedin OFDM systems. However, in FBMC-OQAM systems, because the OQAM pre-processingsplits the spread data into the real and imaginary parts, the DFT spreading canresult in only marginal PAPR reduction. This letter proposes a novelmap-DFT-spread FBMC-OQAM scheme. In this scheme, the transmitting data symbolsare first mapped with a conjugate symmetry rule and then coded by the DFT.According to this method, the OQAM pre-processing can be avoided. Compared withthe simple DFT-spread scheme, the proposed scheme achieves a better PAPRreduction. In addition, the effect of the prototype filter on the PAPR isstudied via numerical simulation and a trade-off exists between the PAPR andout-of-band performances.

Low Peak-to-Average Power Ratio FBMC-OQAM System based on Data Mapping and DFT Precoding