Near-Field Experimental Verification of Separation of OAM Channels

Mari, Elettra; Spinello, Fabio; Oldoni, Matteo; Ravanelli, Roberto A.; Romanato, Filippo; Parisi, G.

doi:10.1109/lawp.2014.2369536

Cited by 108 publications

(47 citation statements)

References 13 publications

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“…However, OAM multiplexing is attractive as a way to provide higher-rate transmission in an LOS channel environment without the need for complex signal processing such as channel diagonalization. Studies regarding OAM multiplexing in the wireless communication field are categorized into antenna design and beam generation [34]- [38], proof of concept experiments [15], [16], [35], signal processing method [39]- [41], and system study such as capacity analysis and link budget [42]- [44].…”

Section: Related Work In Oam Multiplexingmentioning

confidence: 99%

“…Various types of antenna designs were reported using helicoidally deformed parabolic antennas [34], spiral phase plates (SPP) [15], [16], [35], holographic plates (HP) [35], elaborately tuned planer SPPs [36], and so on [37], [38]. Despite some reports of successful transmissions, it seems to be hard to perform multiplexing in a practical manner using such antennas since each OAM mode needs a differently located antenna.…”

Section: Related Work In Oam Multiplexingmentioning

confidence: 99%

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Orbital Angular Momentum (OAM) Multiplexing: An Enabler of a New Era of Wireless Communications

Lee

Sasaki

Fukumoto

et al. 2017

IEICE Trans. Commun.

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SUMMARY This paper explores the potential of orbital angular momentum (OAM) multiplexing as a means to enable high-speed wireless transmission. OAM is a physical property of electro-magnetic waves that are characterized by a helical phase front in the propagation direction. Since the characteristic can be used to create multiple orthogonal channels, wireless transmission using OAM can enhance the wireless transmission rate. Comparisons with other wireless transmission technologies clarify that OAM multiplexing is particularly promising for point-to-point wireless transmission. We also clarify three major issues in OAM multiplexing: beam divergence, mode-dependent performance degradation, and reception (Rx) signal-to-noise-ratio (SNR) reduction. To mitigate mode-dependent performance degradation we first present a simple but practical Rx antenna design method. Exploiting the fact that there are specific location sets with phase differences of 90 or 180 degrees, the method allows each OAM mode to be received at its high SNR region. We also introduce two methods to address the Rx SNR reduction issue by exploiting the property of a Gaussian beam generated by multiple uniform circular arrays and by using a dielectric lens antenna. We confirm the feasibility of OAM multiplexing in a proof of concept experiment at 5.2 GHz. The effectiveness of the proposed Rx antenna design method is validated by computer simulations that use experimentally measured values. The two new Rx SNR enhancement methods are validated by computer simulations using wireless transmission at 60 GHz.

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Section: Related Work In Oam Multiplexingmentioning

confidence: 99%

Section: Related Work In Oam Multiplexingmentioning

confidence: 99%

Orbital Angular Momentum (OAM) Multiplexing: An Enabler of a New Era of Wireless Communications

Lee

Sasaki

Fukumoto

et al. 2017

IEICE Trans. Commun.

View full text Add to dashboard Cite

show abstract

“…Recently, radio beams were also prepared in pure OAM states and superpositions, which proved the prospect for OAM application in the low frequency radio domain8. Afterwards, the dielectric or FSS spiral phase plate91011, spiral reflector12, twisted parabolic reflector131415, the plane reflectarray16, and circular arrays with the shunt-fed or series-fed networks171819 were introduced to generate a single-mode electromagnetic wave carrying non-zero OAM. To get dual-mode OAM beams, a stacked antenna composed of two circular arrays was proposed to achieve a dual-channel OAM wireless communication20, but its construction is relative complicated with two dielectric boards.…”

mentioning

confidence: 99%

Experimental Array for Generating Dual Circularly-Polarized Dual-Mode OAM Radio Beams

Bai

Liang

Sun³

et al. 2017

Sci Rep

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Recently, vortex beam carrying orbital angular momentum (OAM) for radio communications has attracted much attention for its potential of transmitting multiple signals simultaneously at the same frequency, which can be used to increase the channel capacity. However, most of the methods for getting multi-mode OAM radio beams are of complicated structure and very high cost. This paper provides an effective solution of generating dual circularly-polarized (CP) dual-mode OAM beams. The antenna consists of four dual-CP elements which are sequentially rotated 90 degrees in the clockwise direction. Different from all previous published research relating to OAM generation by phased arrays, the four elements are fed with the same phase for both left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The dual-mode operation for OAM is achieved through the opposite phase differences generated for LHCP and RHCP, when the dual-CP elements are sequentially rotated in the clockwise direction. The measured results coincide well with the simulated ones, which verified the effectiveness of the proposed design.

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“…Each class comprises a theoretically infinite set of orthogonal solutions which offers, in principle, the possibility to encode separate channels on the same frequency, an idea that was originally proposed for optical communications [Gibson et al, 2004]. More recently, this aspect and its implications have been deeply explored both theoretically [Thidé et al, 2007] and experimentally [Tamburini et al, 2012] also in the RF domain, leading to significant results [Yan et al, 2014;Mari et al, 2015].A great amount of possibilities exists to generate OAM beams at various frequency ranges [Padgett and Allen, 2000;Berry, 2004;Salo et al, 2002;Trinder, 2005]; among these, one of the most suitable for radio transmissions consists in the use of antenna arrays, where the sought-for solutions can be implemented by means of a proper array synthesis technique [Mohammadi et al, 2010].In the present work we perform the experimental analysis of an OAM-based radio transmission with antenna arrays in the VHF TV band (174 ÷ 230 MHz) supported by a preliminary numerical study. The experiment represents, to the best of our knowledge, the first case of multiple OAM transmission/reception of Digital Video Broadcasting-Terrestrial (DVB-T) signals using a single array of identical radiators on both sides of the communication link, in the far-field region.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

OAM multiple transmission using uniform circular arrays: Numerical modeling and experimental verification with two digital television signals

et al. 2016

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Abstract. In this work we present the outcomes of a radio-frequency OAM transmission between two antenna arrays performed in a real-world context. The analysis is supplemented by deep simulative investigations able to provide both a preliminary overview of the experimental scenario and a posteriori validation of the achieved results. As a first step, the far-field OAM communication link is tested at various frequencies and the corresponding link budget is studied by means of an angular scan generated by the rotation of the receiving system. Then, on the same site, two digital television signals encoded as OAM modes ( = 1 and = −1) are simultaneously transmitted at a common frequency of 198.5 MHz with good mode insulation.

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Near-Field Experimental Verification of Separation of OAM Channels

Cited by 108 publications

References 13 publications

Orbital Angular Momentum (OAM) Multiplexing: An Enabler of a New Era of Wireless Communications

Orbital Angular Momentum (OAM) Multiplexing: An Enabler of a New Era of Wireless Communications

Experimental Array for Generating Dual Circularly-Polarized Dual-Mode OAM Radio Beams

OAM multiple transmission using uniform circular arrays: Numerical modeling and experimental verification with two digital television signals

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