Inter-Carrier Interference Cancellation for 5G System Applying Simplified Universal Time-domain Windowed OFDM
Inter-Carrier Interference Cancellation for 5G System Applying Simplified Universal Time-domain Windowed OFDM
复制标题
应用简化通用时域加窗 OFDM 的 5G 系统载波间干扰消除
DOI：
10.1109/vtc2021-fall52928.2021.9625571
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
H. Harada
中科院分区：
文献类型：
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作者：
Yuu Ichikawa;Keiichi Mizutani;H. Harada
为了提高第五代移动的通信系统（5G）及以后的频谱效率，已经提出了通用时域加窗正交频分复用（UTW-OFDM）。特别地，简化的UTW-OFDM与传统的基于循环前缀的OFDM（CP-OFDM）高度兼容。它可以强烈地抑制带外发射（OOBE）与一个简单的配置乘以一个时间窗口与一个长的过渡长度。然而，在简化的UTW-OFDM中，时间窗口的倍增导致载波间干扰（ICI），这降低了通信质量，特别是对于诸如64 QAM的高阶调制方案。在本文中，首先，我们研究了简化的UTW-OFDM在5G中的适用性。接下来，针对简化的UTW-OFDM应用5G系统提出了ICI消除器，以提高通信质量。在所提出的方法中，一个最佳的ICI消除权重的设计考虑到噪声增强抑制。所提出的方法提高了通信质量，同时实现更强的OOBE抑制。在64 QAM的情况下，简化的UTW-OFDM可以抑制高达45.0 dB的PSD在信道边缘相比，CP-OFDM。
To improve the spectral efficiency of the 5th generation mobile communication system (5G) and beyond, the universal time-domain windowed orthogonal frequency division multiplexing (UTW-OFDM) has been proposed. Particularly, the simplified UTW-OFDM is highly compatible with the conventional cyclic-prefix-based OFDM (CP-OFDM). It can strongly suppress out-of-band emission (OOBE) with a simple configuration of multiplying a time window with a long transition length. However, in the simplified UTW-OFDM, multiplication of the time window causes inter-carrier interference (ICI), which degrades the communication quality, especially for higher-order modulation schemes such as 64QAM. In this paper, firstly, we investigate the applicability of the simplified UTW-OFDM to 5G. Next, an ICI canceller is proposed for the simplified UTW-OFDM-applied 5G system to improve the communication quality. In the proposed method, an optimal ICI cancellation weight is designed by taking the noise enhancement suppression into account. The proposed method improves communication quality while achieving stronger OOBE suppression. In the case of 64QAM, the simplified UTW-OFDM can suppress the PSD at the channel edge by up to 45.0 dB compared to that of CP-OFDM.