Modeling and Performance Analysis of OAM-NFC Systems

Lyu, Runyu; Cheng, Wenchi; Zhang, Wei

doi:10.1109/tcomm.2021.3110871

Cited by 17 publications

(10 citation statements)

References 38 publications

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“…16 by substituting the free-space-channel matrices into Eqs. ( 23) and (24). Figure 16 shows that, in the transceiver-aligned scenario, fractal OAM exhibits superior capacity and BER performances compared to normal OAM.…”

Section: Capacity and Ber Performancesmentioning

confidence: 97%

“…Based on the S-parameter matrices of UCA models in Fig. 15 given by HFSS, which describe the relationship between different ports, we can get the free-space-channel matrices by taking the bottom left quarter of the S-parameter matrices [24]. We then plot the capacity and BER performances for normal OAM and fractal OAM transmissions with aligned and unaligned UCAs in Fig.…”

Section: Capacity and Ber Performancesmentioning

confidence: 99%

“…O RBITAL angular momentum (OAM) [1] is the angular momentum of electromagnetic waves around the propagation axis. It can be used in optical and radio-frequency communications to improve spectrum efficiency [2], [3] and increase energy efficiency [4] by multiplexing and demultiplexing different OAM modes. However, OAM beams are vortically hollow and divergent [5].…”

Section: Introductionmentioning

confidence: 99%

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Fractal OAM Generation and Detection Schemes

Lyu,

Cheng,

Wang

et al. 2024

IEEE J. Select. Areas Commun.

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Orbital angular momentum (OAM) carried electromagnetic waves have the potential to improve spectrum efficiency in optical and radio-frequency communications due to the orthogonal wavefronts of different OAM modes. However, OAM beams are vortically hollow and divergent, which significantly decreases the capacity of OAM transmissions. In addition, unaligned transceivers in OAM transmissions can result in a high bit error rate (BER). The Talbot effect is a selfimaging phenomenon that can be used to generate optical or radio-frequency OAM beams with periodic repeating structures at multiples of a certain distance along the propagation direction. These periodic structures make it unnecessary for the transceiver antennas to be perfectly aligned and can also alleviate the hollow divergence of OAM beams. In this paper, we propose Talboteffect-based fractal OAM generation and detection schemes using a uniform circular array (UCA) to significantly improve capacity and BER performance in unaligned OAM transmissions. We first provide a brief overview of fractal OAM. Then, we propose the fractal OAM beam generation and detection schemes. Numerical analysis and simulations verify the effectiveness of our proposed fractal OAM generation scheme and also demonstrate improved capacity and BER performance compared to normal OAM transmissions. We also analyze how the receive UCA radius and the distance between the UCAs impact the capacity and BER performances.

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Section: Capacity and Ber Performancesmentioning

confidence: 97%

Section: Capacity and Ber Performancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fractal OAM Generation and Detection Schemes

Lyu,

Cheng,

Wang

et al. 2024

IEEE J. Select. Areas Commun.

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“…OAM technology can be used in all of the scenarios to improve the rate-energy (R-E) performances. For near-field inductive coupling based SWIPT, OAM technology can significantly increase the spectrum efficiency [13] as well as provide multi streams for DPS of EH and ID. For far-field directive power beaming, which are often in LOS channels, OAM technology can increase the degree of freedom and improve the R-E performances as discussed in Advantage 1 and Advantage 2.…”

Section: Advantages and Rate-energy Performances Analysis For Oam-bas...mentioning

confidence: 99%

OAM-SWIPT for IoE-Driven 6G

et al. 2022

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Simultaneous wireless information and power transfer (SWIPT), which achieves both wireless energy transfer (WET) and information transfer, is an attractive technique for future Internet of Everything (IoE) in the sixth-generation (6G) mobile communications. With SWIPT, battery-less IoE devices can be powered while communicating with other devices. Line-ofsight (LOS) RF transmission and near-field inductive coupling based transmission are typical SWIPT scenarios, which are both LOS channels and without enough degree of freedom for high spectrum efficiency as well as high energy efficiency. Due to the orthogonal wavefronts, orbital angular momentum (OAM) can facilitate the SWIPT in LOS channels. In this article, we introduce the OAM-based SWIPT as well as discuss some basic advantages and challenges for it. After introducing the OAM-based SWIPT for IoE, we first propose an OAM-based SWIPT system model with the OAM-modes assisted dynamic power splitting (DPS). Then, four basic advantages regarding the OAM-based SWIPT are reviewed with some numerical analyses for further demonstrating the advantages. Next, four challenges regarding integrating OAM into SWIPT and possible solutions are discussed. OAM technology provides multiple orthogonal streams to increase both spectrum and energy efficiencies for SWIPT, thus creating many opportunities for future WET and SWIPT researches.Index Terms-Wireless energy transfer (WET), simultaneous wireless information and power transfer (SWIPT), orbital angular momentum (OAM), reconfigurable intelligent surface (RIS).

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“…However, the strong channel correlation of LOS channels limits the capacity and the application of SWIPT technology. Fortunately, orbital angular momentum (OAM) [5] waves can be multiplexed/demultiplexed together to increase the spectrum efficiency without additional power in LOS channels [6], [7]. Thus, OAM technology can increase energy efficiency and facilitate SWIPT in LOS channels [8].…”

Section: Introductionmentioning

confidence: 99%

Joint Reflection and Power Splitting Optimization for RIS-assisted OAM-SWIPT

Lyu

Cheng

2022

GLOBECOM 2022 - 2022 IEEE Global Communications Conference

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Simultaneous wireless information and power transfer (SWIPT) can enhance the spectrum and power efficiencies of wireless communications networks. Line-of-sight (LOS) transmission is a typical SWIPT scenario. However, the strong channel correlation limits the spectrum and energy efficiencies of SWIPT in the LOS channel. Due to the orthogonal wavefronts, orbital angular momentum (OAM) waves can facilitate the SWIPT in LOS channels. With the assistance of the reconfigurable intelligent surface (RIS), both the energy efficiency and capacity can be further improved for the OAM-SWIPT systems. In this paper, we model the RIS-assisted OAM-SWIPT transmission and derive the optimal reflection coefficients and power splitting ratio for it. We first give the system and channel models. Then, we propose the transmission scheme. Based on the transmission scheme, we formulate the capacity and energy harvesting (EH) trade-off problem. We solve the problem by developing an alternating optimization algorithm. Simulations validate the capacity and EH enhancements brought by the RIS for OAM-SWIPT.Index Terms-Simultaneous wireless information and power transfer (SWIPT), orbital angular momentum (OAM), reconfigurable intelligent surface (RIS).

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Modeling and Performance Analysis of OAM-NFC Systems

Cited by 17 publications

References 38 publications

Fractal OAM Generation and Detection Schemes

Fractal OAM Generation and Detection Schemes

OAM-SWIPT for IoE-Driven 6G

Joint Reflection and Power Splitting Optimization for RIS-assisted OAM-SWIPT

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