Reducing the Complexity of FS-FBMC Receivers using Hopping DFT

Abstract

Filter Bank MultiCarrier (FBMC) modulation with one of its variants, the Offset Quadrature Amplitude Modulation (OQAM) is considered as one of the most favored candidates for future 5G air interface. The transceiver architectures of FBMC-OQAM is categorized into two main design approaches: using PolyPhase Network (PPN) and using Frequency Spreading (FS). The PPN approach requires a lower complexity while the FS based architecture shows better performance when considered at the receiver. In this paper we introduce and analyze an improved FS-FBMC receiver architecture which will reduce the required computational load. The proposed structure is based on a recently introduced variant of the sliding Discrete Fourier Transform (DFT) known as Hopping DFT (HDFT). We show that by applying the HDFT, the FS complexity can be reduced.