Line-of-Sight Millimeter-Wave Communications Using Orbital Angular Momentum Multiplexing Combined With Conventional Spatial Multiplexing
Line-of-Sight Millimeter-Wave Communications Using Orbital Angular Momentum Multiplexing Combined With Conventional Spatial Multiplexing
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DOI：
10.1109/twc.2017.2675885
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发表时间：
2017-05-01
影响因子：
10.4
通讯作者：
Willner, Alan E.
中科院分区：
文献类型：
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作者：
Ren, Yongxiong;Li, Long;Willner, Alan E.
视线无线通信可以受益于通过相同介质同时传输多个独立数据流以增加系统容量。一种常见的方法是使用具有空间分离的发射机/接收机天线的传统空间复用，为此，通过在接收机处采用多输入多输出（MIMO）信号处理来减少信道间串扰。传输多个数据流的另一种相当新的方法是使用轨道角动量（OAM）复用，其采用OAM波束之间的正交性来最小化信道间串扰并实现有效的复用（解复用）。在本文中，我们探讨了利用这两种复用技术，以提供系统设计的灵活性和性能增强的潜力。我们演示了一个16 Gbit/s的毫米波链路，使用OAM复用与传统的空间复用相结合，在一个短的链路距离为1.8米（短于瑞利距离）。具体来说，我们实现了一个空间复用系统的2x2天线孔径架构，其中每个发射机孔径包含两个多路复用的4 Gbit/s的数据承载OAM波束。在接收器处使用基于MIMO的信号处理来减轻信道干扰。我们的实验结果表明，MIMO处理后的所有信道的性能改善，每个信道的误码率低于3.8 × 10（-3）的前向纠错限制。我们还模拟了4 × 4 MIMO系统和2 × 2 MIMO与OAM复用的容量。我们的工作表明，OAM复用和传统的空间复用可以同时利用，以提供设计的灵活性。这两种方法的组合可以潜在地增强给定发射机/接收机的固定孔径区域的系统容量（当链路距离在几个瑞利距离内时）。
Line-of-sight wireless communications can benefit from the simultaneous transmission of multiple independent data streams through the same medium in order to increase system capacity. A common approach is to use conventional spatial multiplexing with spatially separated transmitter/receiver antennae, for which inter-channel crosstalk is reduced by employing multiple-input-multiple-output (MIMO) signal processing at the receivers. Another fairly recent approach to transmitting multiple data streams is to use orbital-angular-momentum (OAM) multiplexing, which employs the orthogonality among OAM beams to minimize inter-channel crosstalk and enable efficient (de) multiplexing. In this paper, we explore the potential of utilizing both of these multiplexing techniques to provide system design flexibility and performance enhancement. We demonstrate a 16 Gbit/s millimeter-wave link using OAM multiplexing combined with conventional spatial multiplexing over a short link distance of 1.8 meters (shorter than Rayleigh distance). Specifically, we implement a spatial multiplexing system with a 2x2 antenna aperture architecture, in which each transmitter aperture contains two multiplexed 4 Gbit/s data-carrying OAM beams. A MIMO-based signal processing is used at the receiver to mitigate channel interference. Our experimental results show performance improvements for all channels after MIMO processing, with bit-error rates of each channel below the forward error correction limit of 3.8 x 10(-3). We also simulate the capacity for both the 4 x 4 MIMO system and the 2 x 2 MIMO with OAM multiplexing. Our work indicates that OAM multiplexing and conventional spatial multiplexing can be simultaneously utilized to provide design flexibility. The combination of these two approaches can potentially enhance system capacity given a fixed aperture area of the transmitter/receiver (when the link distance is within a few Rayleigh distances).