Reduction of peak-to-average power ratio for FBMC/OQAM signals under the general linear non-symmetrical companding transform with a Laplace distribution

The filter bank multi-carrier with offset quadrature amplitude modulation (FBMC/OQAM) is extensively utilized in communication scenarios characterized by severe Doppler interference, owing its remarkable ability for precise time-frequency positioning concentration. However, the distinctive staggered superposition structure leads to an additional increase in peak-to-average power ratio (PAPR). In this letter, we discover that the unique superposition structure results in a high likelihood of abnormal minima in FBMC/OQAM, consequently diminishing the efficacy of the general companding tansform scheme relying on Gaussian distribution for PAPR reduction. Thus, we introduce a general companding tansform scheme based on the Laplace distribution. The simulation results demonstrate that the proposed scheme offers a 3 dB advantage in PAPR reduction compared to the traditional general companding scheme, while also maintaining a nearly 1 dB advantage in BER.