The Degrees of Freedom in Wireless Line-of-Sight OAM Multiplexing Systems Using a Circular Array of Receiving Antennas

Opare, Kwasi Adu-Boahen; Kuang, Yujun; Kponyo, Jerry John; Nwizege, Kenneth S.; Zhang, Enzhan

doi:10.1109/acct.2015.52

Cited by 24 publications

(7 citation statements)

References 19 publications

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“…Potential follow-up research directions include the extension to a variety of antenna configurations such as uniform rectangular arrays (URAs), which offer superior form factors. It is also interesting to optimize antenna arrangements under uniform circular arrays (UCAs) structure, which has a deep connection with orbital angular momentum multiplexing techniques using multiantenna systems [37], [38]. Another worthwhile direction is the analysis of the robustness in the face of residual multipath propagation, i.e., in channels exhibiting Rice fading [7, sec.…”

Section: Discussionmentioning

confidence: 99%

Reconfigurable ULAs for Line-of-Sight MIMO Transmission

Lee

Lozano

2021

IEEE Trans. Wireless Commun.

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This paper establishes an upper bound on the capacity of line-of-sight multiantenna channels over all possible antenna arrangements and shows that uniform linear arrays (ULAs) with an SNR-dependent rotation of transmitter or receiver can closely approach such capacity-and in fact achieve it at low and high SNR, and asymptotically in the numbers of antennas. Then, as an alternative to mechanically rotating ULAs, we propose to electronically select among multiple ULAs having a radial disposition at either transmitter or receiver, and we bound the shortfall from capacity as a function of the number of such ULAs. With only three ULAs, properly angled, 96% of the capacity can be achieved. Finally, we further introduce reduced-complexity precoders and linear receivers that capitalize on the structure of the channels spawned by these configurable ULA architectures.

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Section: Discussionmentioning

confidence: 99%

Reconfigurable ULAs for Line-of-Sight MIMO Transmission

Lee

Lozano

2021

IEEE Trans. Wireless Commun.

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“…Various types of antenna designs have been reported using helicoidally deformed parabolic antennas [8], spiral phase plates (SPP) [2,3,9], holographic plates [10], elaborately tuned planer SPPs [11], and other components [12,13]. In our latest research, we focused on OAM generation using UCAs [14][15][16]. Figure 1 shows OAM mode generation by using UCAs.…”

Section: Oam Generation Using a Uniform Circular Arraymentioning

confidence: 99%

An Evaluation of Orbital Angular Momentum Multiplexing Technology

et al. 2019

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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.

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“…. , M deployed at of discrete points distributed over a certain region in space, thereby approximating, within the limitations and constraints set by the sampling theorem, [216][217][218], the properties of a single, monolithic two-and three-dimensional transducer that samples the field in a continuous manner [9,69,145,[219][220][221][222][223][224][225][226][227][228][229][230][231][232][233][234][235][236][237]. The fact that it is possible to use arrays of conventional linearmomentum antennas (e.g., dipole antennas) to exploit (a subset of approximate) angular momentum modes, does of course not imply that it is necessary to use such arrays.…”

Section: Angular Momentum Transducersmentioning

confidence: 99%

The physics of angular momentum radio

Thidé

Tamburini

2015

2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC)

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To this day, wireless communications, as well as radio astronomy and other radio science and technology applications, have made predominantly use of techniques built on top of the electromagnetic linear momentum physical layer. As a supplement and/or alternative to this conventional approach, techniques rooted in the electromagnetic angular momentum (moment of momentum) physical layer have been advocated, and promising results from proof-of-concept laboratory and real-world angular momentum wireless and fiber communication experiments were recently reported. A physical observable in its own right, albeit much more sparingly used than other electromagnetic observables such as energy and linear momentum, the angular momentum exploits the rotational symmetry of the electromagnetic field and the rotational (spinning and orbiting) dynamics of the pertinent charge and current densities. Here we present a review of the fundamental physical properties of the electromagnetic angular momentum observable, derived from the fundamental postulates of classical electrodynamics (the Maxwell-Lorentz equations), and put it into its context among the other Poincaré symmetry invariants of the electromagnetic field. The multi-mode quantized character and other physical properties that sets the classical electromagnetic angular momentum apart from the electromagnetic linear momentum are pointed out. We give many of the results both in terms of the electric and magnetic field vectors and in terms of the complex Riemann-Silberstein vector formalism (Majorana-Oppenheimer representation of classical electrodynamics) and discuss formal parallels with first quantization formalism. We introduce generalized and symmetrized extensions of the Jefimenko integral formulas for calculating exact expressions for the electric and magnetic fields directly from arbitrary given electric and/or magnetic source distributions and use them for deriving expressions for the volumetric density of the electromagnetic angular momentum radiated from any given arbitrary localized distribution of charges and currents. Our results generalize earlier results, obtained by other authors for certain specific configurations only, and facilitate the modeling and design of angular momentum transducers. They show that the volume integrated angular momentum density, i.e., the total angular momentum emitted by the sources, always tends asymptotically to a constant when the distance from the source volume tends to infinity, proving that a radiation arrow of time exists also for angular momentum, as it does for linear momentum (the volume integrated Poynting vector). Consequently, angular momentum physics (torque action) offers an alternative or a supplement to linear momentum physics (force action) as a means of transferring information wirelessly over very long distances. This finding opens possibilities for, among other things, a more flexible utilization of the radio frequency spectrum and paves the way for the development of new information transfer techniques. We discuss ...

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The Degrees of Freedom in Wireless Line-of-Sight OAM Multiplexing Systems Using a Circular Array of Receiving Antennas

Cited by 24 publications

References 19 publications

Reconfigurable ULAs for Line-of-Sight MIMO Transmission

Reconfigurable ULAs for Line-of-Sight MIMO Transmission

An Evaluation of Orbital Angular Momentum Multiplexing Technology

The physics of angular momentum radio

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