面向蜂窝无线电演进的灵活快速卷积处理
Flexible fast-convolution processing for cellular radio evolution
AI总结：
本文提出符号同步快速卷积处理方案，以一个OFDM符号的时间分辨率重配置滤波器，支持5G NR混合numerology及与LTE共存。
摘要：
正交频分复用（OFDM）已被选作长期演进（LTE）和第五代新空口（5G NR）的基线波形。基于快速卷积（FC）的频域信号处理近来被视为增强基于OFDM波形频谱特性的有效工具。基于FC的滤波通过使用部分重叠的处理块，以基于快速傅里叶变换（FFT）的有效循环卷积来近似线性卷积。在早期工作中，我们已经表明，基于FC的滤波是用于滤波OFDM信号生成和接收端子带滤波的非常灵活且高效的工具。本文提出一种符号同步的FC处理方案，可灵活地允许滤波器重配置的时间分辨率等于一个OFDM符号，同时在混合numerology场景中支持5G NR的紧密逐载波滤波，这些场景具有可调的子载波间隔、中心频率和子带带宽，并提供与LTE的共存。所提方案被证明可支持设想中的5G NR用例，并为第六代开发提供灵活的起点。
英文摘要：
Orthogonal frequency-division multiplexing (OFDM) has been selected as a baseline waveform for long-term evolution (LTE) and fifth-generation new radio (5G NR). Fast-convolution (FC)-based frequency-domain signal processing has been considered recently as an effective tool for spectrum enhancement of OFDM-based waveforms. FC-based filtering approximates linear convolution by effective fast Fourier transform (FFT)-based circular convolutions using partly overlapping processing blocks. In earlier work, we have shown that FC-based filtering is a very flexible and efficient tool for filtered-OFDM signal generation and receiver side subband filtering. In this paper, we present a symbol-synchronous FC-processing scheme flexibly allowing filter re-configuration time resolution equal to one OFDM symbol while supporting tight carrier-wise filtering for 5G NR in mixed-numerology scenarios with adjustable subcarrier spacings, center frequencies, and subband bandwidths as well as providing co-exitence with LTE. The proposed scheme is demonstrated to support envisioned use cases of 5G NR and provide flexible starting point for sixth generation development.
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