Novel UF-OFDM Transmitter: Significant Complexity Reduction Without Signal Approximation
Novel UF-OFDM Transmitter: Significant Complexity Reduction Without Signal Approximation
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DOI：
10.1109/tvt.2017.2764379
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发表时间：
2018-03
影响因子：
6.8
通讯作者：
Jérémy Nadal;C. A. Nour;A. Baghdadi
中科院分区：
文献类型：
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作者：
Jérémy Nadal;C. A. Nour;A. Baghdadi
即将到来的第五代（5G）移动通信系统旨在支持多种新业务和用例，实现灵活统一的连接。为了满足相应的需求，提出了通用滤波正交频分复用（UF-OFDM）来取代现有的波形，因为它结合了OFDM的优点，具有更好的频谱特性和更好的抗时频失调的鲁棒性。然而，它的主要缺点在于，如果不进行简化，发射机的计算复杂度高达OFDM的200倍。虽然仍然具有很高的复杂性，但大多数有效的简化技术显著地损害了通过信号近似实现的光谱限制。在此背景下，提出了一种无信号质量损失的新型低复杂度UF-OFDM发射机。对于较小的子带大小，无论分配的子带数量如何，复杂度都可以与OFDM相媲美。此外，提出的发射机结构灵活，可以很容易地适应OFDM调制。
The upcoming fifth generation (5G) of mobile communication system aims to support multiple new services and use cases toward a flexible and unified connectivity. In order to meet the corresponding requirements, Universal-Filtered Orthogonal Frequency-Division Multiplexing (UF-OFDM) was proposed to replace the existing waveform since it combines the advantages related to OFDM with better spectral properties and with improved robustness against time-frequency misalignments. However, its main drawback resides in the computational complexity of the transmitter reaching up to 200 times that of OFDM if no simplification is applied. While still of high complexity, most efficient simplification techniques significantly compromise the achieved spectral confinement through signal approximations. In this context, a novel low-complexity UF-OFDM transmitter without any signal quality loss is proposed. For small subband sizes, the complexity becomes comparable to OFDM regardless of the number of allocated subbands. Furthermore, the proposed transmitter architecture is flexible and can be easily adapted to support OFDM modulation.