PAPR reduction of FBMC-OQAM systems using logarithmic rooting companding

Filter Bank Multicarrier (FBMC) is a multicarrier waveform technology that has a high spectral efficiency, minimal out-of-band (OOB) leakage, and low synchronization needs. With these properties, FBMC is a suitable multicarrier waveform technique for 5G and future wireless networks. FBMC, like other multicarrier waveform schemes, has a high peak-to-average-power ratio (PAPR) problem. In this paper logarithmic rooting companding is investigated for PAPR reduction of FBMC-offset QAM (OQAM) systems. Its’ performance is compared with other nonlinear companding techniques such as µ-law, A-law, rooting and tangent rooting, that are used for PAPR reduction of FBMC-OQAM systems. It was observed that it performed better than previously investigated techniques in terms of PAPR reduction but showed significantly reduced bit-error-rate (BER) performance when compared to that of µ-law, A-law companding techniques, and comparable BER performance to that of rooting and tangent rooting techniques. It was also observed that by appropriately choosing the companding parameters of logarithmic rooting companding a trade-off between PAPR reduction capability and BER performance is achieved.