A5030206584- Optical Wireless Communication Technologies
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Cooperative Communication and Network Coding
- Advanced MIMO Systems Optimization
- Advanced Wireless Communication Technologies
- Optical Coherence Tomography Applications
- Network Traffic and Congestion Control
- Full-Duplex Wireless Communications
- Advanced Optical Network Technologies
- Advanced Wireless Network Optimization
- Orbital Angular Momentum in Optics
Changchun Institute of Optics, Fine Mechanics and Physics
2015-2025
Chinese Academy of Sciences
2015-2025
University of Chinese Academy of Sciences
2019
Harbin Institute of Technology
2013-2015
In this paper, on-off Keying free-space optical (FSO) communication with coherent detection and double adaptive thresholds is proposed. The 3-bit encoding presented in the scheme can significantly improve system performance, there no need of acquiring instantaneous channel state information probability density function (pdf) turbulence model. order to enhance accuracy threshold even further, decision-aided method offered set second threshold. pdfs average bit error rate (BER) are...
The performance of coherent free-space optical (CFSO) communication with phase modulation is limited by both fluctuations and intensity scintillations induced atmospheric turbulence. To improve the system performance, one effective way to use digital estimation. In this paper, a CFSO quadrature phase-shift keying studied. With consideration effects log-normal amplitude Gauss fluctuations, two-stage Mth power carrier estimation (CPE) scheme proposed. simulation results show that noise can be...
A distributed antenna system (DAS) is very attractive, since it can reduce transmit power by shortening the distance between elements (AEs) and mobile station. This paper investigates channel capacity of DAS over a multi-path frequency-selective fading channel. We first show that optimal allocation solution to approaching unrealistic for practical DAS. Then, near-optimal scheme given through maximally tightening upper bound capacity. Approximate analytical results are obtained use...
Relay-aided free-space optical (FSO) communication systems have the ability of mitigating adverse effects link disruption by dividing a long into several short links. In order to solve relay selection (RS) problem in decode and forward (DF) relay-aided FSO system, we model scheme as Markov decision process (MDP). Based on dueling deep Q-network (DQN), DQN-RS algorithm is proposed, which aims at maximizing average capacity. Different from relevant works, switching loss between nodes...
The error performance of the optical wireless communication (OWC) link suffers from effects atmospheric turbulence and pointing errors. multi-input-multi-output (MIMO) system can combat damage by transmitting diverse replicas symbols to receivers, i.e. spatial diversity. However, different delays between transceivers introduce inter-symbol interference (ISI) which degrades performance. during transmission are mainly caused placing locations path differences. This article proposes algorithms...
In this study, we propose a non-data-aided algorithm of the cycle slip self-correcting carrier phase estimation (CSSC-CPE) which mitigates slips caused by blind CPE in coherent wireless optical communication (WOC) system. The CSSC-CPE uses output for cumulative averaging and selects difference δ between two average segments as discriminant parameter. location direction are determined identifying position sign peak value δ. optimal thresholds detection could be derived from probability...
Physical-layer network coding (PNC) has received much attention, both from academia and industry lately, since it takes advantages of multiple-access signals. Because a reduced number time slots (TSs), PNC is capable improving throughput significantly, especially for typical 3-node consisting 2 user terminals 1 relay node. However, with M nodes (M > 3) without adopting additional techniques needs (2M - 2) TSs to realize information exchange among all the nodes, unable distinguish between...
The physical-layer network coding (PNC) becomes a popular research topic, and the multiuser PNC is still an open issue. This paper investigates uniquely-decodable codes (UDC) by using Iterative construction algorithm, applies generated UDC to that based on amplify-and- forward (AF) criterion. Due attractive features of UDC, sum data rate can increase with number users log-linearly. Moreover, only two time slots are needed for any user node obtain sequences transmitted arbitrary user, no...
Abstract Background Speech variations appear at early stages of Alzheimer's disease (AD) and are potential indicators. However, the commonly used neuropsychological assessment scales as screening tools for cognitive impairments have limitations due to possible subjective bias assessors lack sensitivity in voice detection. We propose a solution based on machine learning multi‐dimensional feature extraction data fusion spontaneous speech signals. Method Participates with gold standard...
Nowadays, the end-to-end network is widely used to transmit multimedia information over Internet Protocol (IP) network, and TCP (Transmission Control Protocol) employed guarantee quality of service (QoS) when packet loss happened. However, delay increases by TCP, it could not be acceptable for real-time data communications. Thereby, this paper provides a kind recovery algorithms that combines single parity check RS coding, in which case coding done only block but also different blocks....
In high-speed optical wireless communication (OWC) systems, timing errors can blur the edges of received symbols, defined by deviation a signal’s event from its intended occurrence. The introduce inter-symbol interference (ISI) to neighboring symbols. order mitigate degradation, maximum likelihood (ML) based Timing Error Viterbi Equalization (TEVE) algorithm is proposed, in which probability density functions (PDF) channel conditions and are priori information. mathematical form each branch...
Optical wireless communication (OWC) systems can exhibit high percentage availability, yet suffering from frequent intensity fades caused by turbulence effects and pointing errors. The intuitive method to character the link is using commercial bit error rate testers (BERT) measuring output sequence of receiver, which provides limited information. Thus we propose algorithms for outage synchronization performance, (BER), throughput, fading statistics. inputs consist decoded data received...