用于5G物理层的高效快速卷积波形处理
Efficient Fast-Convolution-Based Waveform Processing for 5G Physical Layer
摘要：
本文研究了快速卷积（FC）滤波方案在第五代（5G）系统中用于灵活有效的波形生成和处理的应用。基于FC的滤波被提出作为通用多模波形处理引擎，而随着第三代合作伙伴项目中5G新无线电标准化的进展，主要关注子带滤波循环前缀正交频分复用（CP-OFDM）信号的有效生成和处理。首先，提出了用于分析FC滤波器处理响应的矩阵模型，并将其用于以频谱良好定位的方式设计CP-OFDM物理资源块（PRB）的滤波组的优化复用，即，窄的保护带。子带滤波能够抑制相邻子带之间的干扰泄漏，从而支持独立的波形参数化和用于不同组的PRB的不同参数配置，以及上行链路中的异步多用户操作。这些是5G波形开发的核心要素，特别是在6 GHz以下的频段。FC滤波器的优化准则是在给定的子带带宽限制约束下，通带误差矢量幅度最小化。优化设计与不同的保护带宽度，PRB组的大小，和基本的设计参数进行了比较，在干扰水平和实现的复杂性。最后，考虑到相邻子带中具有不同参数集或异步传输的情况，给出了广泛的编码5G无线电链路仿真结果，以将所提出的方法与其他子带滤波CP-OFDM方案和时域加窗方法进行比较。此外，使用独立的发射机和接收机处理的CP-OFDM频谱控制的可行性进行了论证。
英文摘要：
This paper investigates the application of fast-convolution (FC) filtering schemes for flexible and effective waveform generation and processing in the fifth generation (5G) systems. FC-based filtering is presented as a generic multimode waveform processing engine while, following the progress of 5G new radio standardization in the Third-Generation Partnership Project, the main focus is on efficient generation and processing of subband-filtered cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) signals. First, a matrix model for analyzing FC filter processing responses is presented and used for designing optimized multiplexing of filtered groups of CP-OFDM physical resource blocks (PRBs) in a spectrally well-localized manner, i.e., with narrow guardbands. Subband filtering is able to suppress interference leakage between adjacent subbands, thus supporting independent waveform parametrization and different numerologies for different groups of PRBs, as well as asynchronous multiuser operation in uplink. These are central ingredients in the 5G waveform developments, particularly at sub-6-GHz bands. The FC filter optimization criterion is passband error vector magnitude minimization subject to a given subband band-limitation constraint. Optimized designs with different guardband widths, PRB group sizes, and essential design parameters are compared in terms of interference levels and implementation complexity. Finally, extensive coded 5G radio link simulation results are presented to compare the proposed approach with other subband-filtered CP-OFDM schemes and time-domain windowing methods, considering cases with different numerologies or asynchronous transmissions in adjacent subbands. Also the feasibility of using independent transmitter and receiver processing for CP-OFDM spectrum control is demonstrated.
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