Filter Bank Multi-Carrier (FBMC) modulation is a promising modulation technique that is expected to play an important role in future 5G systems alongside Orthogonal Frequency Division Multiplexing (OFDM). In spite of its attractive properties, mainly the signal is well localized in frequency and time, a major drawback to FBMC is the high signal processing load compared with OFDM. Although FBMC using PolyPhase Network (PPN) requires lower computational complexity compared with Frequency Spreading (FS) implementations, FS-FBMC receivers have shown better performance compared with PPN-FBMC, especially when equalization is also considered. In this paper, we focus on reducing the complexity of FS-FBMC receivers by applying Hopping Discrete Fourier Transform (HDFT) instead of Fast Fourier Transform (FFT). Furthermore, we derive an improved HDFT based on the split radix method and analyze the resulting structure in terms of computational complexity. We show that the proposed HDFT based FS-FBMC receiver has a lower complexity and introduces a smaller delay in processing time compared to the conventional FFT based FS-FBMC receiver.

滤波器组多载波（FBMC）调制是一种有前途的调制技术，有望与正交频分复用（OFDM）一起在未来的5G系统中发挥重要作用。尽管具有吸引人的特性，但主要是信号在频率和时间上都很好地定位，与OFDM相比，FBMC的主要缺点是信号处理负载高。尽管与频率扩展（FS）实施相比，使用多相网络（PPN）的FBMC要求较低的计算复杂性，但与PPN-FBMC相比，FS-FBMC接收机表现出更好的性能，尤其是在考虑均衡的情况下。在本文中，我们专注于通过应用跳变离散傅立叶变换（HDFT）而不是快速傅立叶变换（FFT）来降低FS-FBMC接收机的复杂性。此外，我们基于分裂基数方法得出了一种改进的HDFT，并根据计算复杂性分析了所得结构。我们表明，与传统的基于FFT的FS-FBMC接收器相比，基于HDFT的FS-FBMC接收器具有较低的复杂度，并在处理时间上引入了较小的延迟。