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1دورية أكاديمية
المؤلفون: Abdulgani A. Ibrahim, Serdar Özgür Ata, Lütfiye Durak‐Ata
مصطلحات موضوعية: Optical Wireless Communication Systems and Technologies, Electrical and Electronic Engineering, FOS Electrical engineering, electronic engineering, information engineering, Engineering, Physical Sciences, Satellite Communication Networks and Systems, Aerospace Engineering, FOS Mechanical engineering, Radar Wave Propagation and Refractivity Estimation, MIMO Techniques, Atmospheric Turbulence Effects, Channel Modeling, Free-Space Optical Communication, Underwater Optical Communication, Bit error rate, Probability density function, Channel broadcasting, Computer science, Maximal-ratio combining, Encoding memory, Optical communication, Modulation music, Algorithm, Communications system, Free-space optical communication, Diversity gain, Heterodyne poetry, Monte Carlo method, Electronic engineering, Topology electrical circuits
الوصف: In this work, spatial diversity techniques have been proposed for free-space optical (FSO) communication systems to combat the deteriorating effects, such as atmospheric turbulence effects and pointing errors, and the performance of FSO communication systems with Alamouti encoding scheme over Málaga $(\mathcal {M})$ turbulence channel is investigated. We first derive the probability distribution function (PDF) of end-to-end channel gain under atmospheric turbulence and pointing error circumstances. Then, by capitalizing on this PDF, closed-form expressions of the average bit error rate (BER) and the outage probability (OP) for the proposed system are obtained. Additionally, to provide more insights, the asymptotic expressions for the average BER and the OP are also derived. In the analysis, intensity modulation/direct detection and heterodyne detection techniques are considered so that the obtained results can cover both cases. Furthermore, analytic results are successfully validated through Monte Carlo ... : في هذا العمل، تم اقتراح تقنيات التنوع المكاني لأنظمة الاتصالات البصرية في الفضاء الحر (FSO) لمكافحة الآثار المتدهورة، مثل تأثيرات الاضطراب الجوي وأخطاء التأشير، ويتم التحقيق في أداء أنظمة اتصالات FSO مع مخطط ترميز Alamouti على قناة الاضطراب Málaga $(\ mathcal {M })$. نستمد أولاً دالة التوزيع الاحتمالي (PDF) لكسب القناة من طرف إلى طرف في ظل الاضطراب الجوي وظروف الخطأ في الإشارة. ثم، من خلال الاستفادة من ملف PDF هذا، يتم الحصول على تعبيرات مغلقة لمتوسط معدل خطأ البت (BER) واحتمال الانقطاع (OP) للنظام المقترح. بالإضافة إلى ذلك، لتوفير المزيد من الرؤى، يتم أيضًا اشتقاق التعبيرات المقاربة لمتوسط BER و OP. في التحليل، يتم النظر في تقنيات تعديل الكثافة/الكشف المباشر والكشف غير المتجانس بحيث يمكن أن تغطي النتائج التي تم الحصول عليها كلتا الحالتين. علاوة على ذلك، يتم التحقق من صحة النتائج التحليلية بنجاح من خلال عمليات محاكاة مونت كارلو. تسلط نتائجنا الضوء على المكاسب في الأداء التي يمكن تحقيقها عندما يتم استخدام مخطط ترميز العموطي في أنظمة اتصالات خزانات الوقود. ...
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2دورية أكاديمية
المؤلفون: Joseph Isabona, Agbotiname Lucky Imoize
مصطلحات موضوعية: Millimeter Wave Communications for 5G and Beyond, Electrical and Electronic Engineering, FOS Electrical engineering, electronic engineering, information engineering, Engineering, Physical Sciences, Next Generation 5G Wireless Networks, Radar Wave Propagation and Refractivity Estimation, Aerospace Engineering, FOS Mechanical engineering, Propagation Models, Radar Propagation, Computer science, Terrain, Benchmark surveying, Linear regression, Algorithm, Machine learning, Geodesy, Geography, Ecology, FOS Biological sciences, Biology
الوصف: Reliable and real-time propagation loss modeling play a significant role in the efficient planning, development, and optimization of macrocellular communication networks in a given terrain. Thus, the need to adapt or tune an existing model to enhance its signal prediction accuracy in a specified terrain becomes imperative. In this paper, we proposed and applied a non-linear square regression method based on the Levenberg-Marquart (LM) algorithm to adapt and improve the empirical propagation loss estimation accuracy of the Egli model for two major cities in Nigeria. A comprehensive propagation loss measurement acquired over Long Term Evolution (LTE) mobile broadband networks operating at 2630 MHz for four different cities was collected using TEMS investigation tools to achieve the Egli model adaption. Results indicate that the adapted Egli model displays a high estimation accuracy over the Gauss-Newton (GN) algorithm leveraging the non-linear regression method employed to benchmark the propagation ... : ملخص تلعب نمذجة فقدان الانتشار الموثوقة وفي الوقت الفعلي دورًا مهمًا في التخطيط الفعال لشبكات الاتصال الخلوية الكبيرة وتطويرها وتحسينها في منطقة معينة. وبالتالي، فإن الحاجة إلى تكييف أو ضبط نموذج موجود لتعزيز دقة التنبؤ بالإشارة في تضاريس محددة تصبح حتمية. في هذه الورقة، اقترحنا وطبقنا طريقة الانحدار المربع غير الخطي بناءً على خوارزمية ليفنبرغ- ماركوارت (LM) لتكييف وتحسين دقة تقدير خسارة الانتشار التجريبي لنموذج EGLI لمدينتين رئيسيتين في نيجيريا. تم جمع قياس شامل لفقدان الانتشار تم الحصول عليه عبر شبكات النطاق العريض المتنقلة طويلة الأجل (LTE) التي تعمل بسرعة 2630 ميغاهيرتز لأربع مدن مختلفة باستخدام أدوات التحقيق TEMS لتحقيق تكيف نموذج EGLI. تشير النتائج إلى أن نموذج EGLI المعدل يعرض دقة تقدير عالية على خوارزمية غاوس- نيوتن (GN) بالاستفادة من طريقة الانحدار غير الخطي المستخدمة لقياس تقدير خسارة الانتشار. باستخدام ستة مؤشرات إحصائية قياسية، أظهر نموذج EGLI المعدل أخطاء تقدير أقل من نموذج EGLI الكلاسيكي عبر المواقع التي تم اختبارها في المدينتين اللتين تم التحقيق فيهما. أخيرًا، تمت مقارنة نموذج EGLI المكيف مع ...
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المؤلفون: Manav R. Bhatnagar, Muskan Ahuja
المصدر: IEEE Transactions on Molecular, Biological and Multi-Scale Communications. 8:119-137
مصطلحات موضوعية: Molecular communication, Computer Networks and Communications, Computer science, Bioengineering, Interference (wave propagation), Expression (mathematics), Modulation, Modeling and Simulation, Encoding (memory), Bit error rate, Electrical and Electronic Engineering, Encoder, Algorithm, Brownian motion, Biotechnology
الوصف: Diffusion-based molecular communication (DBMC) systems allow messenger molecules to reach the intended receiver using laws of diffusion. The Brownian motion of messenger molecules introduces delay in the system causing the problem of inter-symbol interference (ISI). Along with ISI, the problem of inter-link interference (ILI) comes into picture in the diffusion-based molecular multiple-input multiple-output (DB-MoMIMO) systems. To combat against ISI and ILI issues, index modulation (IM) approaches are recently proposed in the literature for improving the performance of DB-MoMIMO systems. Despite the existence of IM approaches, problems of ISI and ILI still persist due to the slow random motion of molecules in DB-MoMIMO channels. Motivated by this, a novel coded modulation approach called molecular spatio-temporal coded modulation (MSTCM) is proposed in this paper which shows promising improvement in the performance of DB-MoMIMO systems by encoding the information both in space and time axes. Further, if system has access to two types of molecules, the dual-type modulation schemes are discussed for the same. Moreover, the encoder and decoder designs for the proposed mapping strategy are provided. In addition, a theoretical bit error rate expression for the MSTCM scheme is derived and simulation results are shown to corroborate the theoretical ones.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::3d0241696169efb7d875695857e459a6Test
https://doi.org/10.1109/tmbmc.2021.3118950Test -
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المؤلفون: Yunpeng Guan, Zhipeng Feng
المصدر: IEEE Transactions on Industrial Electronics. 69:8396-8410
مصطلحات موضوعية: Series (mathematics), Control and Systems Engineering, Computer science, Mode (statistics), Chirp, Electrical and Electronic Engineering, Interference (wave propagation), Residual, Signal, Algorithm, Chirplet transform, Weighting
الوصف: Signal time-frequency analysis is widely used in industrial fields, for example, machinery fault diagnosis. Current methods cannot well address the multi-components signals with crossing frequency trajectories. For example, the adaptive decomposition methods have mode mixing problem. The linear transforms have smear problems due to the mutual interference caused by crossing frequencies. To address these issues, this paper proposes an iterative approach, named adaptive linear chirplet transform (ALCT). It works by 1) calculating the signal linear chirplet transform (LCT) with a series of chirp rates as parameters; 2) iteratively estimating the characteristics of the signal mode with the highest amplitude in the residual LCT and updating the residual LCT by removing the LCT of the detected mode; 3) constructing the signal time-frequency representation (TFR) based on the estimated characteristics of the detected modes. The ALCT can clearly reveal the TFRs of signals with crossing frequency trajectories. It does not have the frequency estimation errors caused by mode mixing and avoids the mutual interference of the crossing frequencies. It is efficient, as it can obtain the LCT of the detected mode by directly weighting and shifting the LCT reference. The effectiveness of the ALCT is validated using simulations and real-world signals.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::9d2d9cb0135db07f65d4f2c8fa2078d0Test
https://doi.org/10.1109/tie.2021.3097605Test -
5دورية أكاديمية
المؤلفون: Pan, W, Kramer, SC, Piggott, MD
المساهمون: Engineering & Physical Science Research Council (EPSRC)
المصدر: 21 ; 1
مصطلحات موضوعية: Science & Technology, Physical Sciences, Meteorology & Atmospheric Sciences, Oceanography, Non-hydrostatic, sigma-coordinate, Discontinuous Galerkin, Finite element, Coastal ocean model, Wave dispersion, Free surface, Baroclinic flow, FREE-SURFACE FLOWS, NUMERICAL-SIMULATION, BOUSSINESQ EQUATIONS, TSUNAMI GENERATION, WAVE-PROPAGATION, ALGORITHM, VOLUME, DISPERSION, DYNAMICS, SPEED, 0405 Oceanography, 0911 Maritime Engineering
الوصف: A𝜎-coordinate non-hydrostatic coastal ocean model is developed using the discontinuous Galerkin fi-nite element method. With the selection of the low-order piecewise-constant PDG0and piecewise-linearPDG1discretisations in the vertical for the velocity and pressure fields, respectively, the proposed𝜎-coordinatemodel can naturally retain the wave dispersion characteristics of the widely-adopted multi-layer approach ofZijlema and Stelling (2005), which is demonstrated through both mathematical derivation and numerical tests.Under the finite element approach, higher-order vertical discretisation choices can also be readily made whichcan reduce the number of vertical layers required for the accurate representation of wave dispersion. Themodel is verified and validated through comparisons against a series of test cases with analytical solutions orexperimental measurements. All the comparisons demonstrate good agreement, indicating that the proposedmodel can accurately represent dispersive barotropic surface waves with as few as one vertical layer, and cansimulate baroclinic internal waves with reasonable accuracy using relatively coarse mesh resolution. It is alsodemonstrated that consistency in the coupling of barotropic and baroclinic flows can be properly ensured.
العلاقة: Ocean Modelling; http://hdl.handle.net/10044/1/86811Test; EP/M011054/1; EP/L000407/1; EP/R029423/1
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المؤلفون: Hong Wen, Zhumu Fu, Dun Cao, Peng Li, Baofeng Ji, Fazhan Tao, Han Ying, Yanan Wang
المصدر: IEEE Transactions on Intelligent Transportation Systems. 23:9712-9725
مصطلحات موضوعية: Correctness, Computer science, Mechanical Engineering, Node (networking), ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Interference (wave propagation), Telecommunications network, Computer Science Applications, law.invention, Transmission (telecommunications), Relay, law, Automotive Engineering, Algorithm, 5G, Decoding methods
الوصف: The Internet of Vehicles (IoV) has always attracted attention as the emerging communication network with the most development potential in the 5G era. However, the performance of IoV under 5G ultra-dense networks is an open issue, especially in practice the outage probability and ergodic capacity of the relay cooperative IoV network under aggregate interference are still unclear. Therefore, an opportunistic Decoding and Forwarding (DF) relay cooperative transmission algorithm was proposed in this paper when the destination node of IoV has aggregated interference. In addition, based on mathematical theoretical knowledge such as numerical analysis, the closed expressions of the outage probability and ergodic capacity of the IoV system under aggregated interference was derived. Finally, simulation experiments verify the effectiveness of the proposed scheme and the correctness of the theoretical analysis, which improves the transmission rate of the system.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b524087cb9d5bc041b1914a416696f43Test
https://doi.org/10.1109/tits.2021.3106545Test -
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المؤلفون: Fengkui Gong, Yunfei Chen, Junlin Zhang, Mingqian Liu, Nan Zhao, Ning Zhang, Qinghai Yang
المصدر: IEEE Internet of Things Journal. 9:11324-11335
مصطلحات موضوعية: Computer Networks and Communications, Computer science, Covariance matrix, business.industry, TK, MIMO, Interference (wave propagation), Computer Science Applications, symbols.namesake, Cognitive radio, TA, Hardware and Architecture, Gaussian noise, Signal Processing, symbols, Wireless, Cluster analysis, business, Algorithm, Gaussian network model, Computer Science::Information Theory, Information Systems
الوصف: Identification of transmit-antenna number is of importance in cognitive Internet of Things with multiple-input multiple-output (MIMO). Previous studies on transmit-antenna number detection only consider Gaussian noise and ignore impulsive interference. In the practical wireless communication, impulsive interference may exist due to low-frequency atmospheric noise, multiple access and electromagnetic disturbance. Such interference can usually be modeled as symmetric alpha stable (SαS), which cause the performance degradation of conventional algorithms based on Gaussian model. In this paper, we present a novel scheme to detect the transmit-antenna number for MIMO systems in cognitive Internet of Things, assuming that signals are corrupted by both SαS interference and Gaussian noise. We first introduce a new approach to characterize the generalized correlation matrix, and provide its bound with SαS interference. Then, the discriminating feature vector is constructed by utilizing the higher-order moments (HOM) of eigenvalues of the generalized correlation matrix. Finally, an advanced clustering algorithm is employed to detect the transmit-antenna number, using the cluster where the minimum eigenvalue is located. The proposed algorithm avoids the need for a priori information about the transmitted signals, such as coding mode, modulation type and pilot patterns. Simulation experiments demonstrate the feasibility of the proposed transmit-antenna number detection scheme in MIMO systems with Gaussian noise and SαS interference.
وصف الملف: application/pdf
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ea1b70b42f200ed79488878da43f022Test
https://doi.org/10.1109/jiot.2021.3127747Test -
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المؤلفون: Mengru Sun, Jun Liu, Peiqin Tang, Chengpeng Hao, Weijian Liu
المصدر: IEEE Transactions on Aerospace and Electronic Systems. 58:1868-1877
مصطلحات موضوعية: Computer science, Aerospace Engineering, Electrical and Electronic Engineering, Interference (wave propagation), Algorithm, Subspace topology
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::4362828168bfc8c7ba3ca4b853760524Test
https://doi.org/10.1109/taes.2021.3122933Test -
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المؤلفون: Thomas Lymburn, Thomas Jüngling, Michael Small
المصدر: IEEE Transactions on Neural Networks and Learning Systems. 33:2586-2595
مصطلحات موضوعية: Dynamical systems theory, Hierarchy (mathematics), Computer Networks and Communications, Computer science, Echo (computing), MathematicsofComputing_NUMERICALANALYSIS, Interference (wave propagation), Computer Science Applications, Nonlinear system, Artificial Intelligence, Consistency (statistics), Range (statistics), State (computer science), Algorithm, Software, Computer Science::Information Theory
الوصف: We study the propagation and distribution of information-carrying signals injected in dynamical systems serving as reservoir computers. Through different combinations of repeated input signals, a multivariate correlation analysis reveals measures known as the consistency spectrum and consistency capacity. These are high-dimensional portraits of the nonlinear functional dependence between input and reservoir state. For multiple inputs, a hierarchy of capacities characterizes the interference of signals from each source. For an individual input, the time-resolved capacities form a profile of the reservoir's nonlinear fading memory. We illustrate this methodology for a range of echo state networks.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da2db03bd0aaeeb6083fbe04e5121316Test
https://doi.org/10.1109/tnnls.2021.3119548Test -
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المؤلفون: Philippe Rostaing, Roland Gautier, Clément Demeslay
المساهمون: Equipe Security, Intelligence and Integrity of Information (Lab-STICC_SI3), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)
المصدر: IEEE internet of things journal
IEEE internet of things journal, IEEE, 2021, pp.1-1. ⟨10.1109/JIOT.2021.3114439⟩مصطلحات موضوعية: Signal Processing (eess.SP), Computer Networks and Communications, Computer science, Monte Carlo method, 02 engineering and technology, Interference (wave propagation), Discrete Fourier transform, LoRa interference, symbols.namesake, LoRa waveform, FOS: Electrical engineering, electronic engineering, information engineering, 0202 electrical engineering, electronic engineering, information engineering, Waveform, Fading, Electrical Engineering and Systems Science - Signal Processing, performance analysis, Computer Science::Information Theory, Detector, 020206 networking & telecommunications, Computer Science Applications, multi-path channel, Additive white Gaussian noise, Hardware and Architecture, Signal Processing, symbols, 020201 artificial intelligence & image processing, chirp modulation, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Algorithm, Information Systems, Communication channel
الوصف: International audience; This paper presents a semi-analytical approximation of Symbol Error Rate (SER) for the well known LoRa Internet of Things (IoT) modulation scheme in the following two scenarios: 1) in multi-path frequency selective fading channel with Additive White Gaussian Noise (AW GN) and 2) in the presence of a second interfering LoRa user in flat-fading AW GN channel. Performances for both coherent and non-coherent cases are derived by considering the common Discrete Fourier transform (DF T) based detector on the received LoRa waveform. By considering these two scenarios, the detector exhibits parasitic peaks that severely degrade the performance of the LoRa receiver. We propose in that sense a theoretical expression for this result, from which a unified framework based on peak detection probabilities allows us to derive SER, which is validated by Monte Carlo simulations. Fast computation of the derived closedform SER allows to carry out deep performance analysis for these two scenarios.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c933183c9d9ec9cae43ee2085be39fb4Test
https://doi.org/10.1109/jiot.2021.3114439Test
