Radio vortex for future wireless broadband communications with high capacity

The position-sensitivity security communication scheme with orbital angular momentum (OAM) directional modulation (DM) beam pattern generated by the uniform circular frequency diverse array (FDA) is proposed. The transmitter employs FDA antennas to generate dual-mode range-dependent OAM beam and the direction information of OAM beam is modulated into the signal. The designed signal with random frequency offset excites the element of the uniform circular FDA to generate orthogonal OAM signals in the desired position. In the undesired position, the intensity pattern and the phase front of the radio beam vary randomly with the digital sequence transmission, which can make eavesdropping difficult. Since the modulation waveform has position-dependent, the signal can be purposely distorted in undesired positions to provide transmission security for the legitimate user. The composite dual-mode OAM signal makes it more difficult for eavesdroppers to demodulate correct messages. The receiver with a single antenna employs the phase compensation and helical phase factor to restore the correct digital signal in the desired position. Numerical results show that the space position-sensitivity OAM-DM technology based on FDA offers a security transmission scheme.

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“…When two combined vortex signals are transmitted, it is achieved by multiplying the opposite helical phase factor

{e}^{-\mathrm{j}{l}_x\gamma }

to the received vortex signals for OAM signal demodulation 38 . Therefore, OAM mode detection is an important step.…”

Section: Oam‐dm Signal Receptionmentioning

confidence: 99%

Position‐sensitivity security transmission with orbital angular momentum directional modulation based on frequency diverse array

Zhu

Song

Dang

et al. 2022

Trans Emerging Tel Tech

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“…OAM has high degree of freedom owing to the orthogonality between multiple beams [6]. Moreover, OAM can improve its performance combining other transmission technologies, such as orthogonal frequency-division multiplexing and index modulation [7]. On the one hand, the most common antenna types for generating vortex beams are spiral phase plate antennas, holographic gratings, spiral reflectors, meta surfaces, and uniform circular array (UCA) antennas.…”

Section: Introductionmentioning

confidence: 99%

Divergence Intensity and Mode Combinations for Multiple OAM users

Lee¹,

Lee²,

Shin³

2022

Preprint

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“…61771368) and the Young Elite Scientists Sponsorship Program by CAST (2016QNRC001). the authors of [7], [8] held that OAM can be used in future wireless broadband communications because of its potential ability to achieve high spectrum efficiency. Apart from the radio vortex wireless communications, OAM based free-space optical communications has also been extensively studied [9], [10].…”

Section: Introductionmentioning

confidence: 99%

“…The authors of [6] theoretically and experimentally concluded that mode division multiplexing using OAM can reduce the receiver complexity and achieve high spectrum efficiency. In addition, the authors of [7], [8] held that OAM can be used in future wireless broadband communications because of its potential ability to achieve high spectrum efficiency. Apart from the radio vortex wireless communications, OAM based free-space optical communications has also been extensively studied [9], [10].…”

Section: Introductionmentioning

confidence: 99%

OAM Based Wireless Communications with Non-Coaxial UCA Transceiver

Jing

Cheng

Zhang

et al. 2019

2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

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In the past decade, more and more researchers have concentrated on orbital-angular-momentum (OAM) based radio vortex wireless communications, which is expected to provide orthogonality among different OAM-modes. The uniform circular array (UCA) is considered as one promising antenna structure for OAM based radio vortex wireless communications. However, most studies regarding UCA focus on the scenario where the transmit and receive UCAs are aligned with each other. In this paper, we investigate the radio vortex wireless communications with non-coaxial UCA, i.e., the UCA transceivers are parallel but non-coaxial. We study the channel model and develop the modedecomposition scheme to decompose the OAM-modes. Then, we discuss the impact of included angles on the channel model under non-coaxial scenario. Numerical results are presented to evaluate our developed scheme and show that the spectrum efficiency of the non-coaxial UCA transceiver in some cases is larger than that of the aligned UCA transceiver based radio vortex wireless communications.Index Terms-Orbital angular momentum (OAM), uniform circular array (UCA), non-coaxial UCA, radio vortex wireless communications.

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Radio vortex for future wireless broadband communications with high capacity

Cited by 16 publications

References 7 publications

Position‐sensitivity security transmission with orbital angular momentum directional modulation based on frequency diverse array

Position‐sensitivity security transmission with orbital angular momentum directional modulation based on frequency diverse array

Divergence Intensity and Mode Combinations for Multiple OAM users

OAM Based Wireless Communications with Non-Coaxial UCA Transceiver

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