Bi-Directional OFDM Truncated PS-4096QAM Signals Transmission in a Full-Duplex MMW-RoF System at E-Band
Bi-Directional OFDM Truncated PS-4096QAM Signals Transmission in a Full-Duplex MMW-RoF System at E-Band
复制标题
E 频段全双工 MMW-RoF 系统中的双向 OFDM 截断 PS-4096QAM 信号传输
DOI：
10.1109/jlt.2021.3065834
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发表时间：
2021-06-01
影响因子：
4.7
通讯作者：
Yu, Jianjun
中科院分区：
文献类型：
--
作者：
Wang, Kaihui;Zhou, Wen;Yu, Jianjun
本文提出了一种E频段双向光子辅助毫米波（MMW）传输系统，可应用于未来的移动网络。实验中仅采用一对喇叭天线来支持对称无线信号传输。下行和上行的中心频率分别设置为73.5和83.5 GHz，以避免干扰影响。此外，概率整形（PS）技术用于在有限的SNR下自适应传输速率并提高系统容量。基于Volterra系列的时域均衡器有效地补偿了光电器件引起的非线性失真。根据实验结果，所提出的全双工MMW-RoF系统可以支持OFDM截断PS（TPS）-4096QAM信号传输，其熵为10比特/符号/Hz。我们将最外面点的概率设置为零，生成的 TPS-4096QAM 信号实际上是 PS-1936QAM 信号。该系统可在 2 m 无线距离上同时允许 7 Gbaud TPS-4096QAM 信号下行和上行传输，满足 NGMI 阈值 0.83。此外，当我们采用更高的NGMI阈值0.67时，双向7 Gbaud PS-1024QAM信号传输距离可以延长至13.4 m。因此我们提出的双向传输系统的总速率达到了100 Gbit/s。我们还研究了不同调制格式的 BER 性能。对于具有多种调制格式要求的未来高速回程网络来说，这样的系统是一个有前景的解决方案。
A bi-directional photonics-aided millimeter-wave (MMW) transmission system at E-band is proposed in this article, which can be applied in future mobile networks. Only one pair of horn antennas are adopted in the experiment to support symmetrical wireless signal transmission. The center frequency of the downlink and uplink is set as 73.5 and 83.5 GHz, respectively, to avoid the interference effect. Moreover, the probabilistic shaping (PS) technique is used to adapt transmission rate and improve system capacity under a limited SNR. The time-domain Volterra series based equalizer effectively compensates the nonlinear distortion induced by the photoelectric devices. Based on the experimental results, the proposed full-duplex MMW-RoF system can support OFDM truncated PS (TPS)-4096QAM signal transmission, whose entropy is 10 bits/symbol/Hz. We set the probability of the outermost points to zero and the generated TPS-4096QAM signal is actually a PS-1936QAM one. The system simultaneously allows 7 Gbaud TPS-4096QAM signal downlink and uplink transmission over 2 m wireless distance, satisfying the NGMI threshold at 0.83. Moreover, the bi-directional 7 Gbaud PS-1024QAM signal transmission distance can be extended to 13.4 m when we adopt a higher NGMI threshold at 0.67. So the total rate of our proposed bi-directional transmission system is achieved to 100 Gbit/s. We also investigate the BER performance with different modulation formats. Such a system is a promising solution for future high-speed backhaul networks with multiple modulation format requirements.