混合参数OFDM系统参数间干扰的特征
Characterizing Inter-Numerology Interference in Mixed-Numerology OFDM Systems
摘要：
混合参数集多载波（MN-MC）技术的出现增加了在第五代（5G）通信系统及以后的系统中支持异构服务的灵活性。然而，混合参数集的共存破坏了为具有均匀子载波间隔的重叠子载波的单参数集正交频分复用（SN-OFDM）系统定义的正交性原理。因此，正交性的损失导致参数集间干扰（INI），这使信号生成复杂化并且阻碍信号隔离。在本文中，在MN-OFDM系统中的INI的特点是通过数学建模，并示出主要依赖于系统参数的脉冲形状，子载波之间的相对距离和数字学缩放因子。推导了连续时间和离散时间MN系统的INI的简化公式。推导出的数学框架有利于研究离散化对子载波子集中的INI和部分正交性的影响。简化形式的公式也可用于开发干扰度量和设计缓解技术。
英文摘要：
The advent of mixed-numerology multi-carrier (MN-MC) techniques adds flexibilities in supporting heterogeneous services in fifth generation (5G) communication systems and beyond. However, the coexistence of mixed numerologies destroys the orthogonality principle defined for single-numerology orthogonal frequency division multiplexing (SN-OFDM) systems with overlapping subcarriers of uniform subcarrier spacing. Consequently, the loss of orthogonality leads to inter-numerology interference (INI), which complicates signal generation and impedes signal isolation. In this paper, the INI in MN-OFDM systems is characterized through mathematical modeling and is shown to primarily rely on system parameters with regard to the pulse shape, the relative distance between subcarriers and the numerology scaling factor. Reduced-form formulas for the INI in continuous-time and discrete-time MN systems are derived. The derived mathematical framework facilitates the study of the effect of discretization on the INI and partial orthogonality existing in subsets of the subcarriers. The reduced-form formulas can also be used in developing interference metrics and designing mitigation techniques.
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