PAPR Reduction Scheme for FBMC-OQAM without Side Information

Recently, Low PAPR FBMC (LP-FBMC) was proposed to resolve high peak-to-average power ratio (PAPR) issue of filter bank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM). The LP-FBMC has very small side information (SI) burden (two bits per subframe). However, irrespective of SI size, SI itself is a very annoying burden because sending and reception of SI demands complicated system design and very high reliability. In this paper, we propose a modified version of LP-FBMC which gets rid of necessity of sending SI while preserving BER performances. We embed SI information in the phase term throughout the subframe without additional energy or bandwidth. The receiver detects the SI by checking the phase offset of the decision variables with a fractional increase of computational complexity. Simulation results reveal that if the number of data symbols for SI detection is practically large, SI detection error is negligible and the BER is close to the case of perfect SI. In addition, as the modified LP-FBMC is free from SI burden, we can set the LP-FBMC subframe size to minimum, i.e., 1, which maximizes PAPR reduction gain of LP-FBMC.