You are currently on the new version of our website. Access the old version .

864 Results Found

  • Article
  • Open Access
769 Views
18 Pages

17 August 2025

In the field of the Internet of Things (IoT), technical solutions that enable information transmission with minimal energy consumption are of particular interest. Common solutions frequently used in the field of radio frequency identification (RFID)...

  • Review
  • Open Access
61 Citations
12,139 Views
20 Pages

Advanced DSP for Coherent Optical Fiber Communication

  • Jian Zhao,
  • Yaping Liu and
  • Tianhua Xu

8 October 2019

In this paper, we provide an overview of recent progress on advanced digital signal processing (DSP) techniques for high-capacity long-haul coherent optical fiber transmission systems. Not only the linear impairments existing in optical transmission...

  • Article
  • Open Access
3 Citations
2,594 Views
11 Pages

1 February 2024

In this study, we developed a wide and deep network-based nonlinear equalizer to compensate for nonlinear impairment in coherent optical communication systems. In our proposed equalizer, the power feature factor and inter-symbol feature sequence in t...

  • Communication
  • Open Access
1,037 Views
12 Pages

Optical Communication Performance of Cylindrical Vector Partially Coherent Laguerre–Gaussian Beams in Atmospheric Turbulence

  • Meng Liu,
  • Linxuan Yao,
  • Yaru Gao,
  • Hui Zhang,
  • Yangsheng Yuan,
  • Bohan Guo and
  • Huimin Shi

2 September 2025

The optical communication performance of cylindrical vector partially coherent Laguerre–Gaussian (PCLG) beams in different atmospheric turbulence models are investigated. Based on the unified theory of coherence and polarization and turbulence...

  • Article
  • Open Access
11 Citations
2,658 Views
12 Pages

Nonlinear impairments caused by devices and fiber transmission links in a coherent optical communication system can severely limit its transmission distance and achievable capacity. In this paper, we propose a low-complexity pruned-convolutional-neur...

  • Communication
  • Open Access
4 Citations
3,140 Views
13 Pages

17 September 2021

In optical communication systems, coherent detection is a standard method. The received signal enters the digital domain after passing through a time-interleaved analog-to-digital converter (TI-ADC). However, the time delay of the ADC brings noise in...

  • Article
  • Open Access
6 Citations
2,477 Views
14 Pages

A Low-Complexity Joint Compensation Scheme of Carrier Recovery for Coherent Free-Space Optical Communication

  • Xinyu Tang,
  • Liqian Wang,
  • Wei Zhang,
  • Shanyong Cai,
  • Yuemei Li and
  • Zhiguo Zhang

In this paper, a low-complexity joint compensation scheme of carrier recovery (JCSCR) for coherent free-space optical (CFSO) communication is proposed. We applied the carrier recovery joint compensation approach to a CFSO communication system in the...

  • Feature Paper
  • Article
  • Open Access
4 Citations
6,594 Views
9 Pages

Phase Noise Cancellation in Coherent Communication Systems Using a Radio Frequency Pilot Tone

  • Tianhua Xu,
  • Cenqin Jin,
  • Shuqing Zhang,
  • Gunnar Jacobsen,
  • Sergei Popov,
  • Mark Leeson and
  • Tiegen Liu

5 November 2019

Long-haul optical fiber communication employing digital signal processing (DSP)-based dispersion compensation can be distorted by the phenomenon of equalization-enhanced phase noise (EEPN), due to the reciprocities between the dispersion compensation...

  • Article
  • Open Access
3,718 Views
15 Pages

Modulation Format Recognition Scheme Based on Discriminant Network in Coherent Optical Communication System

  • Fangxu Yang,
  • Qinghua Tian,
  • Xiangjun Xin,
  • Yiqun Pan,
  • Fu Wang,
  • José Antonio Lázaro,
  • Josep M. Fàbrega,
  • Sitong Zhou,
  • Yongjun Wang and
  • Qi Zhang

28 September 2024

In this paper, we skillfully utilize the discriminative ability of the discriminator to construct a conditional generative adversarial network, and propose a scheme that uses few symbols to achieve high accuracy recognition of modulation formats unde...

  • Article
  • Open Access
3 Citations
6,562 Views
18 Pages

Analytical Investigations on Carrier Phase Recovery in Dispersion-Unmanaged n-PSK Coherent Optical Communication Systems

  • Tianhua Xu,
  • Gunnar Jacobsen,
  • Sergei Popov,
  • Jie Li,
  • Tiegen Liu,
  • Yimo Zhang and
  • Polina Bayvel

24 September 2016

Using coherent optical detection and digital signal processing, laser phase noise and equalization enhanced phase noise can be effectively mitigated using the feed-forward and feed-back carrier phase recovery approaches. In this paper, theoretical an...

  • Article
  • Open Access
8 Citations
4,341 Views
11 Pages

12 March 2021

The Gram–Schmidt orthogonalization procedure (GSOP) and Löwdin symmetric orthogonalization procedure (SYOP) are the two mainstream algorithms for the compensation of phase mismatch in an imperfect optical 90° hybrid. In this paper, we put forward an...

  • Article
  • Open Access
1 Citations
1,926 Views
20 Pages

In this work, we present a novel four-channel coherent optical chaotic secure communication (COCSC) system, incorporating four simultaneous photonic reservoir computers in tandem with four coherent demodulation units. We employ a quartet of photonic...

  • Article
  • Open Access
6 Citations
2,906 Views
7 Pages

10 February 2020

We investigate advantages and disadvantages of using Gazeau–Klauder coherent states for optical communication. In this short paper we show that using an alphabet consisting of coherent Gazeau–Klauder states related to a Kerr-type nonlinea...

  • Article
  • Open Access
5 Citations
1,848 Views
21 Pages

Coherent Chaotic Communication Using Generalized Runge–Kutta Method

  • Ivan Babkin,
  • Vyacheslav Rybin,
  • Valery Andreev,
  • Timur Karimov and
  • Denis Butusov

27 March 2024

Computer simulation of continuous chaotic systems is usually performed using numerical methods. The discretization may introduce new properties into finite-difference models compared to their continuous prototypes and can therefore lead to new types...

  • Letter
  • Open Access
8 Citations
3,936 Views
13 Pages

7 September 2020

The coherence time is the time over which the channel-gain-values correlation coefficient drops below a predefined threshold. The coherence time is typically used to quantify the pace of appreciable channel changes and is important, for example, for...

  • Review
  • Open Access
27 Citations
9,863 Views
15 Pages

Recent Advances in Coherent Optical Communications for Short-Reach: Phase Retrieval Methods

  • Abdullah S. Karar,
  • Abdul Rahman El Falou,
  • Julien Moussa H. Barakat,
  • Zeynep Nilhan Gürkan and
  • Kangping Zhong

Short-reach transmission systems traditionally utilize intensity modulation (IM) at the transmitter and direct detection (DD) at the receiver due to their cost-effectiveness, small footprint, and low power consumption. However, with the exponential i...

  • Article
  • Open Access
3 Citations
2,173 Views
17 Pages

On the Communication Performance of Airborne Distributed Coherent Radar

  • Qinhao Wu,
  • Bo Zhang,
  • Hongqiang Wang and
  • Jinlin Peng

22 June 2022

Compared with a monostatic radar, airborne distributed coherent radar (ADCR) has been widely applied thanks to its flexibility, greater degree of freedom, stronger detection, and anti-jamming ability. Unlike distributed ground-based radar, the precon...

  • Article
  • Open Access
4 Citations
3,802 Views
16 Pages

21 January 2022

The use of digital signal processors (DSP) to equalize coherent optical communication systems based on spatial division multiplexing (SDM) techniques is widespread in current optical receivers. However, most of DSP implementation approaches found in...

  • Article
  • Open Access
16 Citations
4,238 Views
11 Pages

We numerically investigate spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) for local oscillators, which are based on an injection locking technique used in coherent optical communications. Under the spin polarization modulation...

  • Article
  • Open Access
13 Citations
4,409 Views
16 Pages

The increasing use of technology by older persons and their preferences for living at home and being independent have created an avenue for self-care and care delivery using mobile technologies and health communication. This study aimed to explain ho...

  • Review
  • Open Access
10 Citations
4,461 Views
17 Pages

Machine Learning for Self-Coherent Detection Short-Reach Optical Communications

  • Qi Wu,
  • Zhaopeng Xu,
  • Yixiao Zhu,
  • Yikun Zhang,
  • Honglin Ji,
  • Yu Yang,
  • Gang Qiao,
  • Lulu Liu,
  • Shangcheng Wang and
  • Junpeng Liang
  • + 5 authors

31 August 2023

Driven by emerging technologies such as the Internet of Things, 4K/8K video applications, virtual reality, and the metaverse, global internet protocol traffic has experienced an explosive growth in recent years. The surge in traffic imposes higher re...

  • Article
  • Open Access
1 Citations
1,778 Views
17 Pages

Coherent free-space optical communication offers significant advantages in terms of communication capacity, making it particularly suitable for high-speed inter-satellite transmission within satellite communication networks. Nonetheless, the presence...

  • Article
  • Open Access
10 Citations
3,925 Views
11 Pages

Performance Analysis of Satellite-to-Ground Coherent Optical Communication System with Aperture Averaging

  • Hongwei Li,
  • Yongmei Huang,
  • Qiang Wang,
  • Dong He,
  • Zhenming Peng and
  • Qing Li

5 December 2018

The satellite-to-ground optical communication system suffers from atmosphere turbulence severely. It is well-known that the coherent detection can increase the receiver sensitivity and performing aperture averaging can reduce the scintillation caused...

  • Article
  • Open Access
4 Citations
3,923 Views
10 Pages

Phase Offset Tracking for Free Space Digital Coherent Optical Communication System

  • Hongwei Li,
  • Yongmei Huang,
  • Qiang Wang,
  • Dong He,
  • Zhenming Peng and
  • Qing Li

26 February 2019

The coherent receiving method can improve the sensitivity of an optical signal receiver for free space optical communication system effectively. To implement coherent receiving, the phase offset between the local laser in the receiver and the receive...

  • Article
  • Open Access
28 Citations
3,867 Views
15 Pages

A Low-Complexity Underwater Acoustic Coherent Communication System for Small AUV

  • Weihua Jiang,
  • Xiaoyu Yang,
  • Feng Tong,
  • Yijun Yang and
  • Tianhua Zhou

15 July 2022

While underwater acoustic (UWA) communication offers a practical way to establish a wireless link with underwater vehicles, designing a UWA communication system onboard a small autonomous underwater vehicle (AUV) still poses significant challenges. A...

  • Article
  • Open Access
9 Citations
3,136 Views
18 Pages

29 November 2022

By combining the nonlinear impairment features derived from the first-order perturbation theory, we propose a nonlinear impairment compensation (NLC) scheme based on the transfer learning-assisted convolutional bidirectional long short-term Memory (C...

  • Article
  • Open Access
1 Citations
1,874 Views
14 Pages

20 September 2024

To effectively mitigate the effects of atmospheric turbulence in free space optical (FSO) communication, we propose a parallel carrier frequency offset estimation (FOE) scheme based on time-tagged QPSK partitioning (TTQP). This scheme can be applied...

  • Article
  • Open Access
13 Citations
5,104 Views
15 Pages

30 April 2022

Coherent detection provides the optimum performance for free space optical (FSO) communication systems. However, such detection systems are expensive and require digital phase noise compensation. In this paper, the transmission performance of long-ha...

  • Review
  • Open Access
18 Citations
4,802 Views
14 Pages

Methods of Atmospheric Coherence Length Measurement

  • Ming Li,
  • Pengxin Zhang and
  • Jiawei Han

15 March 2022

Free-space optical (FSO) communication possesses the advantages of high security, large information capacity, high-speed transmission, small terminal size, low power consumption, easy and flexible deployment, etc. It is a promising communication tech...

  • Article
  • Open Access
3 Citations
2,170 Views
19 Pages

Analysis of High-Frequency Communication Channel Characteristics in a Typical Deep-Sea Incomplete Sound Channel

  • Yunfei Li,
  • Ning Jia,
  • Jianchun Huang,
  • Ruigang Han,
  • Zhongyuan Guo and
  • Shengming Guo

7 November 2023

Deep-sea acoustic communication has attracted widespread attention in recent years. Research on deep-sea acoustic communication channel characteristics is essential for the development and system design of deep-sea acoustic communication technologies...

  • Article
  • Open Access
4 Citations
3,378 Views
15 Pages

Low-Complexity Chromatic Dispersion Equalization FIR Digital Filter for Coherent Receiver

  • Zicheng Wu,
  • Sida Li,
  • Zhiping Huang,
  • Fangqi Shen and
  • Yongjie Zhao

This paper proposes a novel and efficient low-complexity chromatic dispersion equalizer (CDE) based on finite impulse response (FIR) filter architecture for polarization-multiplexed coherent optical communication systems. The FIR filter coefficients...

  • Article
  • Open Access
365 Views
21 Pages

23 December 2025

This study examines how major global hotel groups construct sustainability through corporate communication, assessing both the thematic content and the internal coherence of their Environmental-Social-Governance (ESG) narratives. The research questio...

  • Article
  • Open Access
2 Citations
1,742 Views
15 Pages

Propagation Properties of Partially Coherent Flat-Topped Beam Rectangular Arrays in Plasma and Atmospheric Turbulence

  • Xinkai Ma,
  • Hui Zhang,
  • Yuanhao Zhao,
  • LinXuan Yao,
  • Changchun Yu,
  • Yaru Gao,
  • Yangsheng Yuan,
  • Yangjian Cai and
  • Bohan Guo

19 January 2025

Propagation properties represent a critical aspect of laser beams utilized in free space optical (FSO) communications. We examined the evolution characteristics of the electric field associated with partially coherent flat-topped beam rectangular arr...

  • Article
  • Open Access
1 Citations
746 Views
19 Pages

In gravitational wave measurement and inter-satellite laser communication systems, the relative rotation and motion between the transmitter and receiver terminals introduces small angular deviations over a link distance of thousands of kilometers, wh...

  • Article
  • Open Access
13 Citations
3,789 Views
15 Pages

Atmospheric effects including absorption and scattering, and turbulence could introduce signal power loss and severe mode crosstalk for the orbital angular momentum (OAM)-based free-space optical communication (FSOC). Therefore, it is of great signif...

  • Article
  • Open Access
3 Citations
3,373 Views
15 Pages

A Salutogenic Perspective on End-of-Life Care among the Indigenous Sámi of Northern Fennoscandia

  • Lena Kroik,
  • Carol Tishelman,
  • Krister Stoor and
  • Anette Edin-Liljegren

There is limited empirical data about both health and end-of-life (EoL) issues among the Indigenous Sámi of Fennoscandia. We therefore aimed to investigate experiences of EoL care and support among the Sámi, both from the Sámi community itself as wel...

  • Article
  • Open Access
9 Citations
2,765 Views
13 Pages

8 December 2022

This paper proposes the use of quasi-stationary aircraft and reconfigurable intelligent surfaces (RIS) to improve the system performance in satellite–terrestrial laser communication downlink. Single-input multiple-output (SIMO) technology is ap...

  • Article
  • Open Access
2 Citations
2,376 Views
14 Pages

This study explored the mental health and job satisfaction of Ultra-Orthodox women who work in different cultural environments. Data were gathered from 304 Ultra-Orthodox women who belong to various streams in this society and who were recruited by t...

  • Article
  • Open Access
2 Citations
3,717 Views
11 Pages

Helstrom Bound for Squeezed Coherent States in Binary Communication

  • Evaldo M. F. Curado,
  • Sofiane Faci,
  • Jean-Pierre Gazeau and
  • Diego Noguera

31 January 2022

In quantum information processing, using a receiver device to differentiate between two non-orthogonal states leads to a quantum error probability. The minimum possible error is known as the Helstrom bound. In this work, we study the conditions for s...

  • Communication
  • Open Access
2 Citations
1,709 Views
9 Pages

20 September 2024

Light intensity flicker is the most basic and important effect of turbulence. Fiber coupling efficiency is the primary parameter that ensures the system’s communication quality. The light intensity flicker effect caused by atmospheric turbulenc...

  • Article
  • Open Access
279 Views
20 Pages

Design and Experimental Research of Vortex Beam Mixer

  • Chenghu Ke,
  • Xinwen Zhang,
  • Xizheng Ke and
  • Peng Li

26 November 2025

Based on the birefringence phenomenon of vortex beam in uniaxial crystals for optical path design, yttrium vanadate crystals and waveplates are used to realize coherent mixing of vortex beam. A crystal-type spatial light mixer applied to a vortex bea...

  • Article
  • Open Access
9 Citations
2,963 Views
11 Pages

Modulation Format Identification Based on Signal Constellation Diagrams and Support Vector Machine

  • Zhiqi Huang,
  • Qi Zhang,
  • Xiangjun Xin,
  • Haipeng Yao,
  • Ran Gao,
  • Jinkun Jiang,
  • Feng Tian,
  • Bingchun Liu,
  • Fu Wang and
  • Qinghua Tian
  • + 2 authors

2 December 2022

In coherent optical communication systems, where multiple modulation formats are mixed and variable, the correct identification of signal modulation formats provides the foundation for subsequent performance improvement using digital algorithms. A mo...

  • Feature Paper
  • Review
  • Open Access
101 Citations
11,003 Views
25 Pages

Frequency Comb-Based WDM Transmission Systems Enabling Joint Signal Processing

  • Lars Lundberg,
  • Magnus Karlsson,
  • Abel Lorences-Riesgo,
  • Mikael Mazur,
  • Victor Torres-Company,
  • Jochen Schröder and
  • Peter A. Andrekson

We review the use of optical frequency combs in wavelength-division multiplexed (WDM) fiber optic communication systems. In particular, we focus on the unique possibilities that are opened up by the stability of the comb-line spacing and the phase co...

  • Article
  • Open Access
17 Citations
3,930 Views
10 Pages

Propagation of Optical Coherence Vortex Lattices in Turbulent Atmosphere

  • Yan Huang,
  • Yangsheng Yuan,
  • Xianlong Liu,
  • Jun Zeng,
  • Fei Wang,
  • Jiayi Yu,
  • Lin Liu and
  • Yangjian Cai

3 December 2018

Propagation properties in the turbulence atmosphere of the optical coherence vortex lattices (OCVLs) are explored by the recently developed convolution approach. The evolution of spectral density distribution, the normalized M 2 -factor, and...

  • Article
  • Open Access
442 Views
17 Pages

25 November 2025

Free-space optical (FSO) communication systems offer fiber-like bandwidth, high security, and rapid deployment; however, their performance is highly susceptible to atmospheric impairments, such as dust storms, which can cause fading that degrades lin...

  • Article
  • Open Access
2 Citations
4,214 Views
9 Pages

Quantum Computing in Community Detection for Anti-Fraud Applications

  • Yanbo (Justin) Wang,
  • Xuan Yang,
  • Chao Ju,
  • Yue Zhang,
  • Jun Zhang,
  • Qi Xu,
  • Yiduo Wang,
  • Xinkai Gao,
  • Xiaofeng Cao and
  • Yin Ma
  • + 1 author

27 November 2024

Fraud detection within transaction data is crucial for maintaining financial security, especially in the era of big data. This paper introduces a novel fraud detection method that utilizes quantum computing to implement community detection in transac...

  • Article
  • Open Access
1,333 Views
19 Pages

This study examines the relationship between the communication tone of the Fed and that of the ECB over the period from January 2000 to September 2023. The tones were measured using both lexicon-based and transform-based algorithms. Wavelet coherence...

  • Article
  • Open Access
439 Views
18 Pages

Research on Variable Baseline Coherent Angle Measurement Based on Nutation Scanning

  • Dixiang Zeng,
  • Xiaonan Yu,
  • Ziqi Zhang,
  • Peng Lin,
  • Rui Weng,
  • Wenfang Jiao and
  • Shoufeng Tong

8 November 2025

In inter-satellite laser communication systems, angular deviations between the boresights of terminals exert an impact on system performance, thereby imposing higher requirements on performance parameters such as the angle measurement accuracy and ra...

  • Article
  • Open Access
3 Citations
3,220 Views
13 Pages

27 October 2021

With the arrival of 5G wireless communication systems, there has been increased interest in exploring higher frequency bands above 6 GHz, up to millimeter-wave frequencies. Radio wave propagation at these higher frequencies can suffer from substantia...

  • Article
  • Open Access
5 Citations
4,430 Views
8 Pages

Fast Frequency Acquisition and Phase Locking of Nonplanar Ring Oscillators

  • Yunxiang Wang,
  • Chen Wang,
  • Yangping Tao,
  • Yang Liu,
  • Qiang Zhou,
  • Jun Su,
  • Zhiyong Wang,
  • Shuangjin Shi and
  • Qi Qiu

9 October 2017

Optical phase locking is a critical technique in space coherent optical communication and active coherent laser beam combining. In a typical optical phase locking loop based on nonplanar ring oscillators, the pull-in range is normally less than 1 MHz...

of 18