Orbital angular momentum (OAM) carried electromagnetic waves have the potential to improve spectrum efficiency in optical and radio-frequency communications due orthogonal wavefronts of different OAM modes. However, beams are vortically hollow divergent, which significantly decreases capacity transmissions. In addition, unaligned transceivers transmissions can result a high bit error rate (BER). The Talbot effect is self-imaging phenomenon that be used generate or with periodic repeating...

Simultaneous wireless information and power transfer (SWIPT), which achieves both energy (WET) transfer, is an attractive technique for future Internet of Everything (IoE) in 6G mobile communications. With SWIPT, battery-less IoE devices can be powered while communicating with other devices. Line-of-sight (LoS) RF transmission near-field inductive-coupling-based are typical SWIPT scenarios, LoS channels without enough degree freedom high spectrum efficiency as well efficiency. Due to the...

Due to its low energy consumption and simplicity, near field communication (NFC) has been extensively used in various short-range transmission scenarios, for example, proximity payment NFC entrance guard. However, the data rate of limits application high demanded such as high-resolution fingerprint identification streaming media well future promising indoor communications among pads, phones, laptops. In this paper, we model analyze performance orbital angular momentum based (OAM-NFC) system,...

In the past decade, more and 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) considered as one promising antenna structure for OAM communications. However, most studies regarding UCA focus scenario where transmit receive UCAs are aligned with each other. this paper, we investigate communications non-coaxial UCA, i.e., transceivers...

Orbital angular momentum (OAM), which is inherently possessed by the electromagnetic (EM) beams, bridges a new way for multiple access using orthogonal OAM-modes in wireless communications. Uniform circular array (UCA), as convenient antenna structure supporting transmission and reception of OAM based signals, has been paid much attention recent years. However, beams generated UCAs are centrally hollow divergent, limiting efficient well long-distance signals. To solve this problem, paper we...

Orbital angular momentum (OAM) in electromagnetic (EM) waves can significantly enhance spectrum efficiency wireless communications without requiring additional power, time, or frequency resources. Different OAM modes EM create orthogonal channels, thereby improving efficiency. Additionally, more easily maintain orthogonality line-of-sight (LOS) transmissions, offering an advantage over multiple-input and multiple-output (MIMO) technology LOS scenarios. However, challenges such as divergence...

Orbital angular momentum (OAM) technology enhances the spectrum and energy efficiency of wireless communications by enabling multiplexing over different OAM modes. However, classical information theory, which relies on scalar models far-field approximations, cannot fully capture unique characteristics OAM-based systems, such as their complex electromagnetic field distributions near-field behaviors. To address these limitations, this paper analyzes from an theory (EIT) perspective,...

Space wireless communications have been developing for several decades, along with traditional orthogonal resources such as frequency and time widely explored. To further increase the capacity of space information networks, new are highly expected to be used communications. In recent years, electromagnetic (EM) waves carrying orbital angular momentum (OAM), which is a kind nonplanar EM (NEWs), received much attention due their beam structures. However, communications, reliability very...

Due to its low energy consumption and high security, near field communication (NFC) has been extensively used in various short-range non-contact transmission scenarios such as the proximity payment NFC entrance guard. However, data rate of limits application demanded scenarios, high-resolution fingerprint identification streaming media transmission. In this paper, we propose orbital angular momentum (OAM) based system significantly increase capacity for systems. With coils circularly...

Orbital angular momentum (OAM) carried electro-magnetic waves can be used for optical and radio-frequency communications to improve spectrum efficiency thanks the orthogonal wavefronts of different OAM modes. However, beams are vortically hollow divergent, which seriously decreases capacity transmissions. Moreover, unaligned-transceiver-based transmissions lead a high bit error rate. In this paper, we propose fractal generation detection schemes, alleviate divergence greatly performance...

Since the relatively low frequency band has been extensively used, design paradigm is shifted to high such as promising millimeter wave (mmWave) in fifth generation (5G) beyond and expected terahertz sixth (6G). Due severe electromagnetic degradation for band, line-of-sight (LOS) transmission short-range high-speed scenarios receiving much attention. In this paper, we introduce nonplanar waves (NEWs) based wireless communications, which can provide a considerable enhancement channel...

Simultaneous wireless information and power transfer (SWIPT) can enhance the spectrum efficiencies of communications networks. Line-of-sight (LOS) transmission is a typical SWIPT scenario. However, strong channel correlation limits energy in LOS channel. Due to orthogonal wavefronts, orbital angular momentum (OAM) waves facilitate channels. With assistance reconfigurable intelligent surface (RIS), both efficiency capacity be further improved for OAM-SWIPT systems. In this paper, we model...