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检索条件"任意字段=14th International Conference on COMmunication Systems and NETworkS, COMSNETS 2022"

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A New Approach to Dealing with the PAPR Problem for OFDM systems via Deep Learning 14

A New Approach to Dealing with the PAPR Problem for OFDM Sys...

引用

14th IEEE international conference on Wireless communications and Signal Processing (WCSP)

作者： Tang, Xinyi Tan, Zhiqiang Xiao, Limin Zhao, Ming Li, Yunzhou Beijing Natl Res Ctr Informat Sci & Technol Beijing Peoples R China Tsinghua Univ Dept Elect Engn Beijing Peoples R China

ISBN: (纸本)9781665450850

Deep Learning is a newly emerging tool in the field of signal processing and brings a promising way to solve some tough problems. In this paper, a novel method called deep learning based clipped reconstruction network (DL-Clip) is proposed for OFDM systems as an effective technique to overcome the PAPR problem, which is a prominent weakness for the OFDM waveform. Specifically, the clipping operation decreases the high PAPR by restricting the signal amplitude below the predetermined threshold at the transmitter, while DL-Clip exploits the correlation in the frequency domain to reconstruct the signal. Simulation results indicate that the proposed method has obvious advantages in reducing PAPR and can save 1 dB of transmit power while achieving the same BER as compared to theoretical OFDM, which effectively reduces energy consumption and transmitting costs, thus satisfying the requirements of green communication.

关键词： OFDM PAPR deep learning clipping

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Deep Learning based RS-OFDM scheme considering mobility environment for Optical Camera communication system 14

Deep Learning based RS-OFDM scheme considering mobility envi...

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14th international conference on Ubiquitous and Future networks, ICUFN 2023

作者： Nguyen, Huy Chung, ByungDeok Jang, Yeong Min Kookmin University Department of Electronics Engineering Seoul136-702 Korea Republic of ENS. Co. Ltd Ansan15655 Korea Republic of

ISBN: (纸本)9798350335385

Rolling-Shutter Orthogonal Frequency-Division Multiplexing was presented in IEEE 802. 15.7a Task Group, which proposed new standard for Optical Camera communication (OCC). OFDM is a digital communication modulation method used in high rate wireless communication to reduce the channel distortion occurred by multi-path effect. Based on this advantage, OFDM has been extensively employed in optical wireless communication for many applications such as the IoT, V2V, V2X, and Smart Factory. However, the movement effect is a significant impact for OWC systems since it results in an optical channel variance in processing time, which decreases performance of OCC system. In the movement environment, to detect the starting f:ame, conventional shows disadvantages, then we have to find new algorithm to increase OCC performance. In this study, the deep learning algorithm was employed instead of Van De Beek algorithm, which reveals disadvantages compared this approach. In a 2 m/s velocity environment, our technique enables the OCC system to communicate over long range (up to 18 m) with low error. © 2023 IEEE.

关键词： Orthogonal frequency division multiplexing

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An Extended Family of No-Hit-Zone Frequency Hopping Sequences for UAVs Cluster communication 14

An Extended Family of No-Hit-Zone Frequency Hopping Sequence...

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14th IEEE international conference on Wireless communications and Signal Processing (WCSP)

作者： Gao, Wendong Guan, Lei Li, Zan Si, Jiangbo Hui, Pei Fu, Hang Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Peoples R China Xidian Univ Sch Telecommun Engn Xian 710071 Peoples R China

ISBN: (纸本)9781665450850

this paper studies the optimal design and performance analysis of a novel class of no-hit-zone frequency hopping sequence (NHZ-FHS) set in large-scale UAV clusters using quasi-synchronous frequency hopping multiple access (QS-FHMA) communication. Although the NHZ-FHS set can offer interference-free FHMA performance when the arrival signal delay (tau) does not exceed the NHZ (Z), i.e., vertical bar t vertical bar = Z, the number of users in the conventional NHZ-FHS set is strictly limited, thus limiting their application in UAV clusters. therefore, we consider an extended family of NHZ-FHSs consists of several conventional NHZ-FHS subsets to form a new FHS set. Moreover, collisions are guaranteed to occur between users using different subsets of frequency hopping sequences only in the zero time delay region, and it is also essential to minimize the Hamming correlation in the zero delay region in this paper. In this paper, such FHS sets are called extended NHZ-FHS (ENHZ-FHS) sets. We derive a lower bound on the maximum Hamming correlation and then provide a construction of the optimal ENHZ-FHS set meeting our proposed lower bound with equality. the theoretical analysis and simulation results show that the ENHZ-FHS set proposed in this paper can meet the communication requirements of UAV clusters with large capacities.

关键词： UAV cluster frequency-hopping sequence no-hit-zone(NHZ) sequence design FHMA system

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Research on the effect of light source beam angle on the performance of ultraviolet communication 14

Research on the effect of light source beam angle on the per...

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14th international conference on Information Optics and Photonics, CIOP 2023

作者： Cao, Fengyu Sun, Haihan Yang, Tao Zhang, Zhiguo School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781510671744

Ultraviolet communication, as a new type of communication, has the advantages of strong anti-interference ability, non-line-of-sight(NLOS), and all-weather operation, so it has been emphasized and become one of the research focuses in the field of wireless communication. And the light source beam angle directly determines the distance and performance of communication, but most of the current studies are limited to simulation to analyze the influence of the beam angle. In this paper, in order to verify the effect of light source beam angle on the performance of line-of-sight(LOS) and NLOS communication systems, four types of collimator lenses for controlling the light source beam angle are designed and molded, and comparative analyses of simulations and measurements are carried out. the result shows that in LOS communication, the smaller the beam angle is, the better the system performance is. In NLOS communication, the change of beam angle has less change on the path loss and almost no effect on the system performance. the conclusion are of guiding significance in promoting the practical application of ultraviolet communication. © 2023 SPIE.

关键词： Light sources

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Ensuring the Completeness and Accuracy of Data in a Customizable Remote Health Monitoring System 14

Ensuring the Completeness and Accuracy of Data in a Customiz...

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14th international conference on Electronics, Computers and Artificial Intelligence, ECAI 2022

作者： Ianculescu, Marilena Nicolau, Dragos Nicolae Alexandru, Adriana National Institute for Research and Development in Informatics Communication Digital Applications & Systems Department Romania Doctoral School of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania

ISBN: (数字)9781665495356

ISBN: (纸本)9781665495356

Providing health care with the extensive support brought by Remote Health Monitoring systems (RHMS) is compulsory relied on a comprehensive and strict management of health data, due to its sensitive feature, amount, complexity and heterogeneity. As the quality, responsiveness, efficiency and reliability of the associated medical outcomes basically depends on the quality and accessibility of health data, specific attention must be paid on ensuring its completeness and accuracy. RO- SmartAgeing system is such a RHMS in which specific tasks and methods are targeted to ensure a strict control of collected data that is stored and further processed for sustaining proactive and preventative health care in an age-friendly smart environment. © 2022 IEEE.

关键词： Health care

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Capacity Analysis of Millimeter-Wave Fading Interference Channels with Beam Misalignment 14

Capacity Analysis of Millimeter-Wave Fading Interference Cha...

引用

14th IEEE international conference on Signal Processing and communications (SPCOM)

作者： Kutty, Shajahan M. Goa Coll Engn Ponda Goa India

ISBN: (数字)9781665482509

ISBN: (纸本)9781665482509

Ergodic capacity of a point-to-point millimeter-wave (mmWave) communication link is significantly influenced by antenna gain. In this paper, the joint impact of beam misalignment, multi-user interference and small signal fading on the achievable capacity of mmWave beamformed point-to-point links is analyzed. the angular spread of rays constituting the non-line-of-sight mmWave multi-path cluster is accounted for while deriving the expression for achievable spectral efficiency (SE) of such links. the evaluation provides accurate bounds on achievable capacity due to the consideration of clustering phenomenon which is peculiar to millimeter wave signal propagation. Numerical evaluation reveals the dependence of achievable SE on the extent of beam misalignment, angular spread of multipath rays and the number of interfering users, thus providing useful insights into the design of beamforming and beam tracking schemes for next generation wireless communication systems.

关键词： Millimeter Wave communication Beam Misalignment Fading Interference Spectral Efficiency

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Design and Optimization of Raman Fiber Amplifier Based on Tellurium Fiber 14

Design and Optimization of Raman Fiber Amplifier Based on Te...

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14th international conference on Measuring Technology and Mechatronics Automation, ICMTMA 2022

作者： Gao, Ruijie Gong, Jiamin Guo, Liufei Lu, Jiaojiao Wu, Chengchao Pei, Mengjie Liu, Wei School of Electronic Engineering Xi'an University of Posts and Telecommunications Xi'an710121 China School of Communication and Information Engineering Xi'an University of Posts and Telecommunications Xi'an710121 China School of Computer Science and Technology Xi'an University of Posts and Telecommunications Xi'an710121 China

ISBN: (纸本)9781665499781

To meet the requirements of transmission speed and capacity for future communication systems, a Raman fiber amplifier with multiple pumped light was designed using tellurite glass fiber as transmission medium. this design takes advantage of the high non-linearity of tellurite glass fibers and enables the Raman fiber amplifier to have high gain and lower gain fluctuations than can be allowed in practical applications through cascade structure and simultaneous pumping of multiple pumped light. Based on this model, the relationship between the gain value and gain fluctuation of Raman fiber amplifier and the fiber transmission length is studied. the appropriate length of the optical fiber is determined, taking full account of the cost factors, while guaranteeing appropriate gain fluctuations and high gain values. the simulation results show that the model achieves an average gain of 39.9dB and a gain fluctuation of less than 2. kIB for signal light with 60nm bandwidth in C+L band when the first and second fiber lengths are 23m and 28m respectively. this is useful for the design of Raman fiber amplifier. © 2022 IEEE

关键词： Tellurium

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Research on Optimization Method of Free Space Optical Link Model Considering Pointing Error 14

Research on Optimization Method of Free Space Optical Link M...

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14th IEEE international conference on Advanced Infocomm Technology (ICAIT)

作者： Zhang, Guiyun Liu, Guangwen Liu, Zhi Yao, Haifeng Chang, Yidi Geng, Tongtong Changchun Univ Sci & Technol Sch Elect & Informat Engn Changchun 130022 Jilin Peoples R China Changchun Univ Sci & Technol Natl & Local Joint Engn Res Ctr Space Optoelect T Changchun 130022 Jilin Peoples R China Being Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (数字)9781665471565

ISBN: (纸本)9781665471565

It is of great significance to study the effect of pointing error for analyzing the performance of free-space optical communication systems. In this paper, the mathematical model of the accurate analytical solution of the channel gain of the space laser communication system under the circular aperture of the Gaussian beam intensity distribution is optimized., and on this basis, the channel model of the free space optical communication system under the influence of atmospheric turbulence is further analyzed, and the joint probability density function of the channel gain under the influence of atmospheric turbulence and pointing error is deduced. the effect of channel gain is simulated and compared with a square aperture approximation model. the results show that, compared with the square aperture approximation model, the gain error can reach up to 72.6% when calculating the channel, the optimization model of the circular aperture is more suitable for the channel gain analysis of free space optical communication.

关键词： free space optical communication pointing error atmospheric turbulence channel gain

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Genetic Algorithms For Tightening Security 14

Genetic Algorithms For Tightening Security

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14th IFIP Wireless and Mobile Networking conference (WMNC) - Artificial Intelligence and networks of the Future

作者： Palumbo, Fabrizio Buji, Adam Yazidi, Anis Haugerud, Harek Oslo Metropolitan Univ Inst Informasjonsteknol Artificial Intelligence Lab AI Lab Oslo Norway

ISBN: (数字)9783903176522

ISBN: (纸本)9783903176522

Proper configuration of operating systems and program parameters is known to be a key security factor in order to remove vulnerabilities. It is known that vulnerabilities can be caused by a human misconfiguration or by an improper chain of parameter settings. It is impossible to find an optimal combination manually due to the enormous number of possible configurations. In this article, we resort to a Genetic Algorithm equipped with a user-defined fitness function in order to compute a configuration of high fitness. Our work presents a two-fold contribution. First, we successfully use a GA to implement a moving target defense by alerting the configuration regularly in order to spoil an attacker's reconnaissance efforts. the GA tightens the security solution by evolving the fitness of the configuration over generations while maintaining diversity within generations across a pool of servers. this resulted in high-quality configurations crucial for a successful moving target defense strategy. Second, we try to find a compromise between tightening the security of the configuration and maintaining the Quality of Service (QoS) on a web server. In practice, usually tightening security on a web server comes at the cost of a decrease in QoS.

关键词： Wireless communication Databases Operating systems Delay effects Quality of service Reconnaissance Web servers

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Comparison of Various Mathematical Models of 8/20 μs Current Surge and their Influence on RFID Marker 14

Comparison of Various Mathematical Models of 8/20 μs Curren...

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14th international conference ELEKTRO, ELEKTRO 2022

作者： Vestenicky, Peter Kanalikova, Alzbeta University of Žilina Faculty of Electrical Engineering and Information Technology Department of Control and Information Systems Žilina Slovakia

ISBN: (纸本)9781665467261

In technical praxis the underground facility networks such as gas and water pipes or telecommunication and energetic cables are marked by special RFID markers to enable localization and identification of the network. Due to influence of climatic effects such as lightning part of the lightning surge current may be induced into the markers. this paper gives a comparison of various mathematical models of the surge current induced into conductors and these mathematical models are used to calculate current waveform in the markers. Finally, the voltage waveform across the capacitor in the marker resonant circuit is calculated to enable proper dimensioning of the capacitor and to increase the long term marker reliability. © 2022 IEEE.

关键词： Differential equations

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