The construction of coupled electrolysis systems utilizing renewable energy sources for electrocatalytic nitrate reduction and sulfion oxidation reactions (NO3RR SOR), is considered a promising approach environmental remediation, ammonia production, sulfur recovery. Here, simple chemical dealloying method reported to fabricate hierarchical porous multi-metallic spinel MFe2O4 (M═Ni, Co, Fe, Mn) dual-functional electrocatalysts consisting Mn-doped NiFe2O4/CoFe2O4 heterostructure networks...

The full-duplex optical communications can be achieved simply by separating the transmitting link and receiving in space. However, it is challenging to achieve non-line-of-sight (NLOS) ultraviolet (UV) communication due serious self-interference caused strong multiple scattering effects of UV signals. To explore capacity NLOS communications, this paper, we first quantify using an analytical channel impulse response function. Based on quantified self-interference, then derive error rate...

Ultraviolet (UV) communication is a promising technology for civilian and military secure systems due to nonline-of-sight transmission, low background noise, high local security. The full-duplex relay-assisted UV communications can achieve longer distances higher efficiency of time–frequency utilization compared with direct communications. However, the strong scattering effect, serious interrelay-interference (IRI) inevitably introduced in multihop relay links. To mitigate impacts IRI, this...

We studied the second-order correlation function of computational ghost imaging, and we gave expressions in signal background region. found total intensity modulated source influences visibility reconstructed image. discussed positive-negative phenomenon a imaging (CGI) system, protocol was given to distinguish positive negative correlations. This allows us determine dividing line correlations before sampling, it verified by our simulations experiments; quality can be greatly improved using...

Coordinated signal processing can obtain a huge transmission gain for Fog Radio Access Networks (F-RANs). However, integrating into large scale, it will lead to high computation complexity in channel estimation and spectral efficiency loss performance. Thus, joint cluster formation scheme is proposed this paper. Considering research remote radio heads (RRHs) centred serving scheme, coalition game formulated order maximize the of cooperative RRHs under conditions balancing data rate cost...

Free Space Optical (FSO) communication is one of the most promising access methods. But, different weather conditions will affect transceiver performance. In this paper, we build a FSO system with 16-ary phase shift key-orthogonal frequency division multiplexing (16PSK-OFDM) downstream signals. We analyze transmission performance 16PSK-OFDM optical signals under five (sunny, light rain, moderate snow, and fog). The spectral diagrams, constellation bit error rate (BER) received are simulation...

A Mach-Zehnder interferometer (MZI) sensor based on a four-core sapphire-derived fiber (FSDF) for bending sensing is proposed and demonstrated. The MZI formed by splicing coupled FSDF between two single-mode fibers, delivering supermode interference among four LP01-like supermodes (LP01s modes) eight LP11-like (LP11s modes). Benefiting from the different response of field distribution each to curvature changes, sensors with variety properties can be fabricated in FSDF. experimental results...

A 40 Gb/s high speed optical transmission system is designed, and the different dispersion compensation schemes are adopted to realize of duo-binary (ODB) signals over 120 km fiber. Optical generated by using a precoder, two low- pass filters (LPF) one mach-zehnder modulator (MZM). Through combination fiber (DCF) single mode (SMF) in link, four (pre-compensation, post-compensation hybrid (pre+ post) (post+ pre)) were compared. Analyzing Q factor, BER, eye diagrams receiver sensitivity...

In order to effectively compensate negative sequence current (NSC) of the V/v traction system and reduce capacity cost railway power conditioner (RPC), a low-cost hybrid (HRPC) technology scheme considering regenerative braking energy is proposed in this paper. The HRPC consists an RPC with modular multilevel converter structure (MMC-RPC) static var compensator (RSVC). First, circuit topology principle NSC compensation are given. Then, configurations MMC-RPC RSVC presented active equipment...

A complementary coded code-division multiple-access (CC-CDMA) system is built on the direct sequence (DS) spread spectrum technique, which can suppress multipath interferences and due to ideal correlation property of codes (CCs). However, DS technique will cause poor bandwidth efficiency; CC-CDMA suffers from serious CCs may not be reconstructed at receiver after passing through asynchronous frequency selective fading channels. In this article, we propose a identical code cyclic shift...

The strong scattering effects of ultraviolet (UV) signals in the atmosphere enables non-line-of-sight (NLOS) ability UV communications, but introduces large time dispersion channel impulse response (CIR), which inevitably results serious inter-symbol interferences (ISIs). Because a larger transmitting rate can introduce ISI, it is meaningful to study impact CIR on ISI and further quantify achievable information (AIR) NLOS communications. In this paper, we analyzed influence both coplanar...

Optical positioning techniques have inherent ad-vantages such as high precision, low power consuming and immunity to the electromagnetic interference. However, it is challenging estimate non-line-of-sight (NLOS) targets using current optical methods. In this work, we propose an NLOS ultraviolet method based on a simplified single-scattering channel model, which can obtain both location pointing direction of transmit-ter. Numerical results demonstrated that proposed achieve error less than 2...

In this paper, the transceiver performance of optical 64QAM-OFDM signals with different sub-car- riers is studied. Firstly, we build a 40Gbit/s coherent transmission system. 16, 32, 64, 128, 256 and 512 sub-carriers are transmitted over 100 km single mode fiber (SMF). Then, spectrum diagrams before after transmission, bit error rate (BER) constellation received were compared. The simulation results show that, number increasing, value PAPR will gradually increase quality deteriorate....

The scarcity of available spreading codes poses a hard limitation to user capacity for code-division multiple access system. In previous work by Liu <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">et al.</i> (2020), the identical code cyclic shift (ICCSMA) scheme was developed, which allows users share one code. However, ICCSMA system uses basic <inline-formula xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math...

Ultraviolet (UV) communication is a promising technology for future vehicle systems due to its inherent advantages including the non-line-of-sight ability, low background noise, and high local security. Full-duplex relay-assisted UV communications can achieve longer distances higher efficiency of time-frequency utilization compared with direct communications. However, full-duplex relay suffers from serious self-interferences strong scattering or reflection signals. To explore influence...

Imaging for an occluded object is usually a significant problem. In this letter, we introduce imaging scheme based on computational ghost imaging, which can obtain the image of target behind obstacle. According to our theory, distance between and obstacle wavelength light source will affect quality reconstructed image. addition, if bucket detector placed far away from obstacle, tiny point-like without collecting lens be applied realize imaging. The theoretical results above have been...

In this letter, a novel hybrid SLM-PTS algorithm for reducing peak-to-average power ratio (PAPR) influence, is proposed and analyzed in an 10Gbit/s 8QAM-OFDM optical access system. After the serial-to-parallel conversion, transmitted signals are divided into two data subblocks, one subblock processed by SLM method other PTS. And then subblocks merged transmission sequence. systems, through comparing PAPR, bit error rate (BER) computational complexity, SLM, PTS methods show their respective...

Energy harvesting (EH) using simultaneous wireless information and power transfer (SWIPT) is an attractive solution in the context of enhancing battery life devices for entirely reliable communication systems. Strong signal can increase transfer. However, it also creates more interference transmitting information, causing realization SWIPT as a challenging problem. In this paper, with multi-input-multi-output (MIMO) considered two users based on precoding design. The source node (SN) will...

Dual Norton model is a two-port based on the method of characteristics and finite differences that often does not require segmenting transmission line. This makes calculation aerial lines be simple. However, it evident accuracy this should affected by Earth resistivity, frequency line length, which has discussed in detail. In paper, an error evaluation proposed application scope investigated for dual model.