This article proposes a generalized model and methods for fast-convolution (FC)-based waveform generation and processing with specific applications to fifth generation new radio (5G-NR). Following the progress of 5G-NR standardization in 3rd generation partnership project (3GPP), the main focus is on subband filtered cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) processing with specific emphasis on spectrally well localized transmitter processing. Subband filtering is able to suppress the interference leakage between adjacent subbands, thus supporting different numerologies for so-called bandwidth parts as well as asynchronous multiple access. The proposed generalized FC scheme effectively combines overlapped block processing with time- and frequency-domain windowing to provide highly selective subband filtering with very low intrinsic interference level. Jointly optimized multi-window designs with different allocation sizes and design parameters are compared in terms of interference levels and implementation complexity. The proposed methods are shown to clearly outperform the existing state-of-the-art windowing and filtering-based methods.

中文翻译：

---

基于广义快速卷积的滤波 OFDM：5G 新无线电的技术和应用

本文提出了一种通用模型和方法，用于基于快速卷积 (FC) 的波形生成和处理，具体应用于第五代新无线电 (5G-NR)。随着第 3 代合作伙伴项目 (3GPP) 中 5G-NR 标准化的进展，主要关注子带滤波循环前缀 (CP) 正交频分复用 (OFDM) 处理，特别强调频谱良好本地化的发射机处理。子带滤波能够抑制相邻子带之间的干扰泄漏，从而支持所谓的带宽部分以及异步多址的不同参数集。所提出的广义 FC 方案有效地将重叠块处理与时域和频域加窗相结合，以提供具有极低固有干扰电平的高选择性子带滤波。具有不同分配大小和设计参数的联合优化多窗口设计在干扰水平和实现复杂度方面进行了比较。所提出的方法明显优于现有的最先进的基于窗口和过滤的方法。