A Full Field-of-View Self-Steering Beamformer for 5G mm-Wave Fiber-Wireless Mobile Fronthaul
A Full Field-of-View Self-Steering Beamformer for 5G mm-Wave Fiber-Wireless Mobile Fronthaul
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DOI：
10.1109/jlt.2019.2956667
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发表时间：
2020-03
影响因子：
4.7
通讯作者：
Min-Yu Huang;You-Wei Chen;P. Peng;Hua Wang;G. Chang
中科院分区：
文献类型：
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作者：
Min-Yu Huang;You-Wei Chen;P. Peng;Hua Wang;G. Chang
即将到来的新的无线电接入允许使用毫米波（mm-Wave）频率的超高数据速率，而它通常遭受大的路径损耗。为了补偿路径损耗，发射器和接收器都使用相控阵列。5G新无线电（NR）三波束管理过程如下进行：首先在从远程无线电单元（RRU）到用户设备（UE）的下行链路方向上扫描发送波束，然后对齐上行链路波束以确定哪个波束方向具有最佳接收质量，反之亦然。然而，这种顺序波束管理要求RX必须能够在所有接收角度上执行波束检测和转向。此外，由于相控阵操作的窄波束宽度，需要在毫米波下操作的接收器的"量子飞跃"性能改进。本文提出了一种自导向阵列波束形成器（SSA-BF）接收系统，它由一个自主设计的零直流功耗集成电路封装和一个4单元天线阵列组成。我们首先在没有天线的情况下进行测量，SSA-BF接收机在全视场（FoV）上显示出显著的阵列因子增强，而SNR下降可以忽略不计。（入射角= ± 90 °），<3 ms快速光束对准时间，并且它可以支持增强的移动的数据速率高达10和7.8 Gb/s，具有背靠背和超过25 km光纤传输中的20 × 100 MHz载波聚合OFDM，分别此外，在5G光纤无线接入中，为所提出的SSA-BF接收机设计了宽面3 dB波束宽度± 80 °和宽带17 - 36 GHz天线。采用1 × 4天线阵的SSA-BF接收系统设计在28 GHz，在入射角为± 68 °和± 85 °的宽视场范围内，归一化阵列增益分别优于3 dB和6 dB衰减。在没有任何外部调谐控制的情况下，所提出的SSA-BF在50 cm无线距离上实现了6 Gb/s 64-QAM信号的最先进的自主波束成形，实现了实质性的阵列因子改善。据作者所知，这是第一次在光纤无线集成无线电接入中演示高速交换SSA-BF接收机，作为毫米波移动的前传应用的真正推动者
The upcoming new radio access allows ultra-high data rate using millimeter-wave (mm-Wave) frequencies, while it normally suffers from large path loss. To compensate for path loss, phased arrays for both the transmitter and receiver are used. The 5G new radio (NR) three beam management process proceeds as follows: The transmitted beam is first swept in the downlink direction from the remote radio unit (RRU) to the user equipment (UE), and then the uplink beam is aligned to determine which beam direction has the best reception quality, and vice versa. However, this sequential beam management requires that the RX must be able to perform both beam detection and steering across all the reception angles. Moreover, due to the narrow beamwidth of the phased array operation, a “quantum leap” performance improvement of the receiver operating at mm-Wave is required. In this article, a self-steering array beamformer (SSA-BF) receiving system is proposed, which is composed of a home-designed IC package with zero DC power consumption and a 4-element antenna array. We first conduct the measurement without the antenna, and the SSA-BF receiver shows a significant array factor enhancement with negligible SNR degradation over full field-of-view (FoV) (incidence angle = ±90°), <3 ms fast beam alignment time, and it can support enhanced mobile data-rate up to 10 and 7.8 Gb/s with 20x100 MHz carrier aggregation OFDM in back-to-back and over 25-km fiber transmission, respectively. Moreover, a broadside 3-dB beamwidth ±80° and broadband 17-36 GHz antenna is designed for the proposed SSA-BF receiver in a 5G fiber-wireless access. The SSA-BF receiving system with the 1 × 4 antenna array is designed at 28 GHz, and it shows the normalized array gain better than 3- and 6-dB degradation over broad FoV incidence = ± 68° and ± 85°, respectively. Without any external tuning controls, the proposed SSA-BF achieves the state-of-the-art autonomous beamforming for 6 Gb/s 64-QAM signal over 50-cm wireless distance, achieving a substantial array factor improvement. To the best of authors’ knowledge, this is the first demonstration of a high-speed switching SSA-BF receiver in a fiber-wireless integrated radio access as a true enabler for mm-Wave mobile fronthaul applications