Multicarrier Division Duplex Aided Millimeter Wave Communications
Multicarrier Division Duplex Aided Millimeter Wave Communications
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DOI：
10.1109/access.2019.2930333
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发表时间：
2019-07
期刊：
影响因子：
3.9
通讯作者：
R. Rajashekar;Chao Xu;Naoki Ishikawa;Lie-liang Yang;L. Hanzo
中科院分区：
文献类型：
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作者：
R. Rajashekar;Chao Xu;Naoki Ishikawa;Lie-liang Yang;L. Hanzo
现有的时分双工(TDD)和频分双工(FDD)技术依靠保护时间和/或保护频带来避免上下行信道之间的自干扰(SI)，从而导致宝贵的频谱资源的浪费。带内 FD (IBFD) 的全双工 (FD) 方案以及多载波分割双工 (MDD) 可以克服这一缺点，同时保留 TDD 和 FDD 的主要优点。此外，MDD 还具有降低信号传输峰值平均功率比 (PAPR) 以及无 SI 信号检测的独特优势。在此背景下，在本文中，我们提出了一种针对频率选择性毫米波 (mmWave) 通道而设计的新型 FD 方案，该方案尚未在公开文献中进行过研究。此外，我们提出了一种新颖的投影辅助迭代特征值分解（P-IEVD）算法，该算法在毫米波通信的固有波束形成结构中执行零空间 SI 消除。我们的仿真结果证实，MDD 能够优于 TDD/FDD 的半双工 (HD) 同类产品，即使 IBFD 也只有在提供足够高的 SNR 时才能实现比 MDD 更好的带宽效率。
The existing time-division duplex (TDD) and frequency-division duplex (FDD) techniques rely on a guard time and/or a guard band to avoid self-interference (SI) between the uplink and downlink channels, which results in the wastage of precious spectral resources. The full-duplex (FD) schemes of in-band FD (IBFD), as well as multicarrier division duplex (MDD), may overcome this drawback while retaining the key benefits of both TDD and FDD. Moreover, the MDD exhibits the exclusive benefits of the reduced peak-to-average-power ratio (PAPR) for signal transmission as well as the SI-free signal detection. Against this background, in this paper, we propose a novel FD scheme conceived for frequency-selective millimeter-wave (mmWave) channels, which have not been investigated in the open literature. Furthermore, we propose a novel projection-aided iterative eigenvalue decomposition (P-IEVD) algorithm, which performs null-space SI cancellation in the inherent beamforming structure of mmWave communication. Our simulation results confirm that the MDD is capable of outperforming its half-duplex (HD) counterparts of the TDD/FDD, even the IBFD can only achieve a better bandwidth efficiency than the MDD when a sufficiently high SNR is provided.