Abstract
This paper reports our investigation of wireless communication performance obtained using orbital angular momentum (OAM) multiplexing, from theoretical evaluation to experimental study. First, we show how we performed a basic theoretical study on wireless OAM multiplexing performance regarding modulation, demodulation, multiplexing, and demultiplexing. This provided a clear picture of the effects of mode attenuation and gave us insight into the potential and limitations of OAM wireless communications. Then, we expanded our study to experimental evaluation of a dielectric lens and end-to-end wireless transmission on 28 gigahertz frequency bands. To overcome the beam divergence of OAM multiplexing, we propose a combination of multi-input multi-output (MIMO) and OAM technology, named OAM-MIMO multiplexing. We achieved 45 Gbps (gigabits per second) throughput using OAM multiplexing with five OAM modes. We also experimentally demonstrated the effectiveness of the proposed OAM-MIMO multiplexing using a total of 11 OAM modes. Experimental OAM-MIMO multiplexing results reached a new milestone for point-to-point transmission rates when 100 Gbps was achieved at a 10-m transmission distance.
Highlights
Wireless communication using orbital angular momentum (OAM) (Orbital Angular Momentum) has drawn much attention as an emerging candidate for beyond 5G technology due to its potential as a means to enable high-speed wireless transmission
Unlike OAM multiplexing, OAM-multi-input multi-output (MIMO) multiplexing exploits multiple sets of the same OAM modes with receiver equalizations [7]
We expanded our interest to experimental evaluation including a dielectric lens and end-to-end wireless transmission
Summary
Wireless communication using OAM (Orbital Angular Momentum) has drawn much attention as an emerging candidate for beyond 5G (fifth generation) technology due to its potential as a means to enable high-speed wireless transmission. Since OAM multiplexing technology is relatively new, it is important to validate the feasibility from various perspectives. We first validated the feasibility from a theoretical perspective using simulations (Section 2). We validated the feasibility from beam generation and propagation perspectives in experiments (Section 3). We concluded by validating the feasibility from the end-to-end wireless communication perspective using experiments (Section 4). Studies regarding OAM multiplexing in the wireless communication field are categorized into antenna design and beam generation, end-to-end experiments, signal processing methods, and system studies for topics such as capacity analysis and link budget.
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