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Stamm, Raini, Meelis Stamm, Jarek Tigane e Reeda Tuula. "Individual proficiency of reception by the Estonian men’s national team at the qualification tournament of the European Championship". Papers on Anthropology 28, n. 1 (17 giugno 2019): 111–25. http://dx.doi.org/10.12697/poa.2019.28.1.09.
Testo completoAbstract (sommario):
The aim of the study was to analyse players’ individual proficiency at serve reception and its influence on the following attack in the Estonian national team during the qualification for the European Championship in 2016.
The subjects were the players of Estonian national volleyball team during the qualification for the European Championship in 2016. To collect data, video recordings of eight games of the Estonian national team were viewed; the number serve receptions, type and zone of reception and proficiency were registered. In addition, the number of attacks following serve reception, their zone, performer and proficiency were recorded.
The results revealed that success at the reception of serve influences the proficiency of attack. At more successful reception, the proficiency of attack was higher than at poorer reception.
As a result of the study, it was shown that serve reception by the Estonian team was more proficient in sets won than in sets lost. In the case of more successful reception, the Estonian national volleyball team was more proficient at attack than in the case of less proficient reception. When types of reception were compared, the receivers of the Estonian national team were most proficient at reception from above. The receivers of the Estonian national received the serve best in zone 5.
2
Ren, Weijie, Jianfeng Sun, Haisheng Cong e Yuxin Jiang. "Sensitivity Deterioration of Free-Space Optical Coherent/Non-Coherent OOK Modulation Receiver by Ambient Light Noise". Sensors 23, n. 4 (14 febbraio 2023): 2140. http://dx.doi.org/10.3390/s23042140.
Testo completoAbstract (sommario):
In free-space optical (FSO) communication systems, on–off keying (OOK) is a widely used modulation format. Coherent and non-coherent OOK receivers with sensitivities of −54.60 dBm and −51.25 dBm, respectively, were built with a communication rate of 1 Gbit/s and a bit error rate of 10−3. In an FSO communication system, the parameters must be designed to ensure a sufficient link margin. In contrast to optical fiber systems, FSO systems have ambient light (AL) noise such as sunlight. The efficiency of sunlight coupling in the single-mode fiber (SMF) of the receivers was calculated in this study. For a signal light with AL, the change in the main components of noise and the sensitivity deterioration were theoretically analyzed and experimentally verified in conditions of coherent reception and non-coherent reception with a preamplifier. For coherent reception, the theoretical sensitivity deterioration results are consistent with the experimental results which indicate that coherent reception exhibits better anti-AL noise performance than non-coherent reception when the power spectral density of the AL is the same. Coherent and non-coherent receivers coupled with SMF can work in direct sunlight. When the receiver lens diameter is greater than 4.88 × 10−4 m, the anti-AL noise performance of the receiver can be improved by increasing the receiver lens diameter.
3
Lapinski, Anna-Liesa S., e Anthony W. Isenor. "Estimating Reception Coverage Characteristics of AIS". Journal of Navigation 64, n. 4 (12 settembre 2011): 609–23. http://dx.doi.org/10.1017/s0373463311000282.
Testo completoAbstract (sommario):
The Automatic Identification System (AIS) is now well established and widely used in commercial shipping. The system originated from a safety mandate but AIS messages have also been shown to be useful from a security situational awareness perspective. In terms of coastal security, AIS messages are often received by land-based receivers positioned along a nation's coastline. The operational range of the receivers is controlled by complex variable VHF propagation characteristics, power of the transmitter, etc. However, certain characteristics of the reception coverage area can be determined from the AIS message receptions themselves. This paper presents an algorithm to compute coverage characteristics using AIS messages. The algorithm is applied to synthetic data with known coverage characteristics, and also real AIS data obtained from the Maritime Safety and Security Information System. Results from the Norwegian, North and Baltic Seas show how the coverage estimate is influenced by the coverage edge, lack of vessel activity, and diversity in the source data.
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Al-Anbagi, Haidar N., e Ivo Vertat. "Cooperative Reception of Multiple Satellite Downlinks". Sensors 22, n. 8 (8 aprile 2022): 2856. http://dx.doi.org/10.3390/s22082856.
Testo completoAbstract (sommario):
Popular small satellites host individual sensors or sensor networks in space but require ground stations with directional antennas on rotators to download sensors’ data. Such ground stations can establish a single downlink communication with only one satellite at a time with high vulnerability to system outages when experiencing severe channel impairments or steering engine failures. To contribute to the area of improving the reception quality of small satellites signals, this paper presents a simple receive diversity scheme with proposed processing algorithms to virtually combine satellite downlink streams collected from multiple omnidirectional receivers. These algorithms process multiple received versions of the same signal from multiple geographically separated receiving sites to be combined in one virtual ground station. This virtual ground station helps detect the intended signal more reliably based only on a network of simple and cooperating software-defined radio receivers with omnidirectional antennas. The suggested receive diversity combining techniques can provide significant system performance improvement if compared to the performance of each individual receiving site. In addition, the probability of system outages is decreased even if one or more sites experience severe impairment consequences. Simulation results showed that the bit error rate (BER) of the combined stream is lower than the BER of the best quality receiving site if considered alone. Moreover, virtual ground stations with cooperative omnidirectional reception at geographically separated receivers also allow data to be received from multiple satellites in the same frequency band simultaneously, as software-defined receivers can digitize a wider portion of the frequency band. This can be a significant conceptual advantage as the number of small satellites transmitting data grows, and it is reasonable to avoid the corresponding necessary increase in the number of fully equipped ground stations with rotators.
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Huang, Yang, Xinyi Zheng, Yufei Guo e Shiming Gao. "Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals". Applied Sciences 12, n. 14 (6 luglio 2022): 6828. http://dx.doi.org/10.3390/app12146828.
Testo completoAbstract (sommario):
Orthogonal frequency division multiplexing (OFDM) technology is presented for use in free-space optical (FSO) communications accompanied by the spatial diversity reception. Using quadrature phase shift keying (QPSK) modulation formats, the OFDM signals show robustness to support high spectral efficiency and compatibility with the spatial diversity reception to improve receiver sensitivity. Compared with the single-carrier QPSK signal, the OFDM-QPSK signal with 64 sub-carriers can reduce the BER from 2.87 × 10−3 to 2.98 × 10−4 at the SNR of 6 dB. Using a two-aperture spatial diversity reception with OFDM, the BER can be reduced from 2.45 × 10−3 of a single receiver to 6.10 × 10−4 under moderate turbulence conditions. Under strong turbulence, the BER of the single receiver is 2.14 × 10−2. It can be improved to 1.16 × 10−3 by using four-aperture receivers, and even 6.87 × 10−4 by using six-aperture receivers. The optimized aperture number should be selected according to channel conditions.
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Szczodrowski, Marian. "Glottokodematische Prozesse unter kybernetischem Aspekt (Ausgewählte Fragen)". Glottodidactica 50, n. 2 (29 dicembre 2023): 101–16. http://dx.doi.org/10.14746/gl.2023.50.2.6.
Testo completoAbstract (sommario):
A significant contribution to broadening and deepening the field of glottodidactics is made, inter alia, by the results of codematic and cybernetic research. Within the glottodidactic system, the following processes can be identified: 1) the encoding of information by the primary sender (the instructor), 2) the sending of information and its linguistic and extralinguistic monitoring to the primary receivers (learners), 3) the reception and decoding of information by the primary receivers, and the construction of matrices of new lexical and grammatical structures, 4) the encoding of information by the secondary sender (the learner), 5) the sending of information to the secondary receiver (the instructor) within a feedback system, 6) the reception of information by the secondary receiver, its checking and correction, the regulation and syntactic ordering and renewal of the glottodidactic process.
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Shatha Kareem Abbas, Et al. "Design and Simulation of Resilient RF Receivers for 5G Interference Mitigation Using MATLAB". International Journal on Recent and Innovation Trends in Computing and Communication 11, n. 9s (31 agosto 2023): 969–80. http://dx.doi.org/10.17762/ijritcc.v11i9s.10103.
Testo completoAbstract (sommario):
Introduction: Advanced terminal capabilities increase mobile broadband traffic, straining spectrum resources. Traditional methods like base stations are expensive. Heterogeneous networks (HetNets) using pico cells attempt to improve efficiency, however interference persists. A suggested mitigation technique uses the modified greatest weighting delay first (MLWDF) algorithm for resource allocation and reception processing, which performs well in simulations. Space, time, frequency, time-frequency, and coding domain interference reduction methods are investigated, each having hardware requirements and restrictions.
Aim and objectives: The study uses MATLAB to construct and simulate robust RF receivers. Enhancing 5G communication network interference reduction is the goal.
Method: Simulink is used to study transmitter and receiver RF losses, including I/Q imbalances, phase noise, and power amplifier non-linearity. Spectrum masks, error vector magnitudes, and peaks-to-average power ratios measure performance. Simulink models examine constellation distortion, neighboring channel rejection, and packet error rates in 802.11ax and 5G waveform reception due to RF impairments. The paper stresses the necessity of reliable data measurement for RF interference analysis and discusses interference mitigation.
Results: Comparing Error Vector Magnitudes (EVMs) in Case 1 and Case 2 shows how NR interference affects HE receptions. EVMs approach -20 dB in Case 1 without NR interference. In Case 2, NR interference distorts constellations and lowers EVMs to -17 dB, suggesting poor reception. ACRs demonstrate NR-free channel separation by measuring power differences. The future investigation involves analyzing ACRs with HE waveforms as interferers and examining system behavior under different interference situations.
Conclusion: To reduce non-idealities in mobile communication transceivers, this thesis presents digital projection interpolation and Wiener-SAF for leakage route and receiver nonlinearity estimation.
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Setiyanto, Budi, Risanuri Hidayat, I. Wayan Mustika e Sunarno Sunarno. "CNR and BER Ranges for the DVB-T2 Reception-Success". International Journal of Electrical and Computer Engineering (IJECE) 7, n. 6 (1 dicembre 2017): 3727. http://dx.doi.org/10.11591/ijece.v7i6.pp3727-3734.
Testo completoAbstract (sommario):
DVB-T2 (Digital Video Broadcasting Terrestrial Second Generation) reception requires a sufficient quality of the received signal. <em>CNR</em> (carrier-to-noise ratio) and <em>BER</em> (bit-error-rate) are two of quantities describing the quality. This paper presents the range of each quantity providing a successful reception based on real data obtained by field-measurements. This data was collected from MO (mobile-outdoor) and SI (stationary-indoor) receiving-systems capturing signal sent by some on-air trial transmitters broadcasting services focused on the fixed-receivers. The result indicated that the successful and failed receptions were split into two quite separated (concentrated) ranges of post-decoded <em>BER</em> and therefore a boundary distinguishing them could be prominently defined. In contrast, they were spread in a wide common range of <em>CNR</em> and pre-decoded <em>BER</em>. Furthermore, the boundary that corresponded to this last quantity was ambiguous. In the case of MO reception as numerical examples, the two split ranges of post-decoded <em>BER</em> were less than about 10<sup>-5</sup> and more than about 2.7 × 10<sup>-4</sup> for the successful and failed receptions, respectively, whereas <em>CNR</em> as high as about 14 dB could be viewed as a soft boundary distinguishing these both reception-success conditions.
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Milosavljević, Srđan, Dejan Milić, Slaviša Trajković, Petar Spalević e Bojana Milosavljević. "LEVEL CROSSING RATE OF MACRODIVERSITY OUTPUT PROCESS IN THE PRESENCE OF η-μ SHORT TERM FADING AND GAMMA LONG TERM FADING". Facta Universitatis, Series: Automatic Control and Robotics 16, n. 2 (24 ottobre 2017): 157. http://dx.doi.org/10.22190/fuacr1702157m.
Testo completoAbstract (sommario):
In this paper macrodiversity reception with macrodiversity selection combining (SC) receiver and two microdiversity MRC receivers operating over shadowed multipath fading channel is studied. Received signal experiences short term fading and correlated Gamma long term fading resulting in system performance degradation. Level crossing rate (LCR) of η-μ random process and level crossing rate of signals at outputs of microdiversity MRC receivers are efficiently calculated. By using these derived formulas, level crossing rate of macrodiversity SC receiver output signal process is calculated. By using this result, average fade duration (AFD) of the proposed wireless communication system can be calculated. The influence of η-μ short term fading severity parameter, Gamma long term fading severity parameter and Gamma long term correlation coefficient on level crossing rate is analysed and studied.
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Chen, Weigang, Dongming Sun, Changcai Han, Jinsheng Yang, Feng Gong e Wei Wang. "Macrodiversity Reception with Distributed Hard-Decision Receivers for Maritime Wireless Sensor Networks". Sensors 20, n. 14 (15 luglio 2020): 3925. http://dx.doi.org/10.3390/s20143925.
Testo completoAbstract (sommario):
Maritime wireless sensor networks are considered to be the primary means of monitoring methods in the marine environment. The transmission between sensor node and sink node in maritime wireless sensor networks is usually unreliable due to the harsh propagation environment. To extend the transmission range or to enhance the transmission reliability between sensor nodes and sink node, we propose a macrodiversity reception scheme in the sink node equipped with distributed multiple hard-decision receivers. Multiple receivers are divided into several clusters and placed at different locations to receive different signal copies suffering from different fadings. Furthermore, a cascaded combining strategy based on hard-decision information is used to reduce the overall complexity of receiving side. The experimental results in the ocean scenarios show that the macrodiversity reception scheme with two antenna clusters has a transmission gain of 3–4 dB compared with the single antenna reception when the package loss rate is 10 − 2 . The study casts a new method for reliable transmission in maritime wireless sensor networks using commercial transceivers which can only output hard-decision results.
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Li, Pengyuan, Tianlin Zhu, Yutong Xin, Gang Yuan, Xiong Yu, Zejian Lu, Zili Liu e Qing Yan. "DMCNet-Pro: A Model-Driven Multi-Pilot Convolution Neural Network for MIMO-OFDM Receivers". Electronics 13, n. 2 (12 gennaio 2024): 330. http://dx.doi.org/10.3390/electronics13020330.
Testo completoAbstract (sommario):
Nowadays, wireless communication technology is evolving towards high data rates, a low latency, and a high throughput to meet increasingly complex business demands. Key technologies in this direction include multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM). This research is based on our previous work DMCNet. In this article, we focus on studying the deep learning (DL) application of neural networks to solve the reception of single-antenna OFDM signals. Specifically, in multi-antenna scenarios, the channel model is more complex compared to single-antenna cases. By leveraging the characteristics of DL, such as automatic learning of parameters using deep neural networks, we treat the reception process of MIMO-OFDM signals as a black box and utilize neural networks to accomplish the signal reception task. Moreover, we propose a data-driven multi-pilot convolution neural network for MIMO-OFDM receivers (DMCNet). By incorporating complex convolution and complex fully connected structures, we design a receiver network to recover the transmitted signals from the received signals. We validate the accuracy and robustness of DMCNet under different channel conditions, comparing the bit error rates with different schemes. Additionally, we discuss the factors influencing various channel effects. At the same time, we also propose a model-driven scheme, DMCNet-pro, which has a higher accuracy and fewer parameters in some scenarios. The experimental results demonstrate that the DL-based reception scheme exhibits promising feasibility in terms of accuracy and interference resistance when compared to traditional approaches.
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Kulikov, G. V., e X. Kh Dang. "Influence of quadrature transformation imbalance on the noise immunity of signal reception with amplitude-phase shift keying". Russian Technological Journal 12, n. 1 (1 febbraio 2024): 59–68. http://dx.doi.org/10.32362/2500-316x-2024-12-1-59-68.
Testo completoAbstract (sommario):
Objectives. At the present time, amplitude-phase shift keyed (APSK) signals are actively used in satellite communication systems. In particular, they are applied in systems which operate in a limited radio frequency spectrum with increased data transmission quality requirements. Such systems use multi-channel type receivers with maximum likelihood decision on the received symbol (correlation receiver) or quadrature type receivers. The noise immunity of these receivers is directly dependent on the quality of the formation of reference oscillations. These oscillations are reference signals for correlation receivers and in-phase and quadrature components for quadrature receivers. The aim of the work is to analyze the influence of the amplitude and phase parameter spread of the in-phase and quadrature channels on the noise immunity of receiving APSK signals with a circular shape of the signal constellation.Methods. Methods of statistical radio engineering, theory of optimal signal reception, and computer simulation are used.Results. The study established the characteristics of noise immunity of the APSK signal reception depending on the spread of parameters of the quadrature converter. The theoretical calculations were confirmed by the results of modeling the transmission of APSK signals in a Gaussian communication channel. A comparison with systems using quadrature amplitude modulation (QAM) was carried out, in order to assess system stability in the presence of spread parameters among other similar systems.Conclusions. The studies enabled us to conclude that an imbalance of the quadrature reference oscillations can lead to a significant decrease in the noise immunity of radio systems using APSK signals. The minimum energy loss due to imbalance of quadrature reference oscillations is achieved when the imbalance value is less than 10% in amplitude and 2°–3° in phase. The amplitude imbalance of quadrature reference oscillations when receiving QAM signals is more pronounced than in the case of APSK signals. The phase imbalance affects approximately the same.
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Yusupov, Ruslan Rifovich, e Alexey Sergeevich Khokhrin. "Correlation receiver with quadrature channels for continuously working automatic cab signalling". Transport of the Urals, n. 3 (2022): 49–54. http://dx.doi.org/10.20291/1815-9400-2022-3-49-54.
Testo completoAbstract (sommario):
Increase of reception validity of continuously working automatic cab signalling (CWACS) signals is still an actual task. One of the possible ways of its solution is to improve existing CWACS receivers of to develop new ones with increased noise immunity. The paper presents a correlation receiver of CWACS signals with quadrature channels. The authors have considered its functional scheme and a simulation model developed in the Simulink environment. Preliminary results gained with the use of the simulation model showed that the receiver is workable. Results of the study can be used at development of new or at improvement of existing microprocessor receivers of CWACS channel.
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Brodin, G. J., J. A. Cooper e J. R. A. Stevens. "Measuring the effect of helicopter rotors on GPS reception". Aeronautical Journal 111, n. 1123 (settembre 2007): 561–70. http://dx.doi.org/10.1017/s0001924000001834.
Testo completoAbstract (sommario):
Abstract This paper describes an experiment which was performed using an offshore transport helicopter to investigate the impact of the rotor blades upon Global Positioning System (GPS) reception. The test aircraft was fitted with two separate GPS antennas which were positioned to isolate the effects caused by the main and tail rotors. Testing was undertaken with the aircraft on the ground and this allowed an assessment to be performed at different rotor speeds with accurate control over the relative geometry between the antenna, rotors and satellites. Recorded data from a measurement system incorporating three dissimilar GPS receivers (including a technical standard order (TSO)-C129() compliant aviation unit and a custom research receiver) was analysed to identify the effect of the rotors at the correlator level and to determine the impacts upon ranging accuracy, the availability of ranging measurements, and the receivers’ signal level estimates. Correlation data was used to demonstrate that the rotor blades were capable of generating both destructive and constructive interference effects, and the periodic nature of these oscillations was shown to correspond directly to the blade passing frequency. It was identified that signal degradation was not limited to satellite signal paths which intersected the rotor discs. No evidence was found for any increase in code measurement error due to the rotor interference, but it was demonstrated that there could be a significant impact upon a receiver’s ability to maintain continuous tracking of the satellite signals. The overall effect of this availability problem for a given installation and type of operation will be dependent upon satellite geometry and other factors which are beyond the scope of this study. The ability of a receiver to identify the presence of rotor interference was investigated by examining estimates of carrier-to-noise, and this revealed inconsistencies between the results from different receivers implying differences in the estimation algorithms employed. It was also identified that two alternative ‘textbook’ estimators do not give identical results in the presence of rotor interference and it is suggested that such data should therefore be interpreted with caution.
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Chang, Jaewon, Junil Ahn, Jeungmin Joo e Dongweon Lee. "Development of Wideband Multi-Channel Receiver for Direction Finding of Communication Signals". Journal of the Korea Institute of Military Science and Technology 24, n. 5 (5 ottobre 2021): 527–36. http://dx.doi.org/10.9766/kimst.2021.24.5.527.
Testo completoAbstract (sommario):
In wireless environments, wideband receivers are used in a communication intelligent system to detect unknown signals and obtain azimuth information. To design a wideband receiver that performs multiple signal detection and direction finding simultaneously, it is necessary to consider a reception structure composed of multiple channels. In this paper, we propose a wideband multi-channel receiver for direction finding of unknown wideband communication signals including frequency hopping signals. A signal processing method for detecting received signals and estimating azimuth information is presented, and components of the manufactured wideband receiver are described. In addition, test results of the signal detection performance by mounting the proposed wideband multi-channel receiver on the flight system are included.
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Coolahan, Marie-Louise. "The Cultural Dynamics of Reception". Journal of Medieval and Early Modern Studies 50, n. 1 (1 gennaio 2020): 1–12. http://dx.doi.org/10.1215/10829636-7986553.
Testo completoAbstract (sommario):
The cultural dynamics of reception are best understood as a reiterative process of reshaping and reframing. Reception as an object of critical study embraces first the history of how texts were read, disseminated, and consumed across media, languages, and geographical regions. But if this is the first port of call, such analysis quickly draws in questions about the relationship between reception and production, audience and agency, about contemporary and posthumous reputation. This special issue investigates the ways in which the act of reception is a reiterative process on a continuous spectrum with cultural production. Receivers — of texts, events, reputations — are mediators, creatively reconstituting that which they receive according to their own agendas and contemporary imperatives. The articles in this collection embrace international, comparative, and new material contexts for early modern reception studies as they address poetry, romance, letters, history, hagiography, autobiography, and literary reviews. The transnational perspectives that emerge lead from the Low Countries to Italy, Ireland to France and the Spanish Netherlands, Spain to England, and England to France. The introductory essay for the issue additionally examines recent digital projects concerned with the history of reading and reception, exploring in particular how digital resource design foregrounds questions of representation and our immersion, as critics, in the act of reception.
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Kousa, M. "Enhancement of RAKE receivers for ultra-wideband reception". IET Communications 2, n. 3 (2008): 422. http://dx.doi.org/10.1049/iet-com:20070061.
Testo completo
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ElHelaly, Alaa, Ahmed H. Mehana e Mohammad M. Khairy. "Reduced-Complexity Receiver for Free-Space Optical Communication over Orbital Angular Momentum Partial-Pattern Modes". International Journal of Antennas and Propagation 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/8514705.
Testo completoAbstract (sommario):
This paper explores the effect of a partial-pattern receiver for transmitted orbital angular momentum (OAM) multimodes included in the Laguerre-Gaussian beam propagating under non-Kolomogorov weak-to-moderate turbulence on the achievable capacity and the error rates with introduced controlled parameters. We deduce the necessary conditions for reducing the receiver’s area to guarantee that the modes are decoupled when the area is reduced. Furthermore, we derive the conditions at which area reduction yields a performance gain over the complete-area reception. For that, some use cases are introduced and discussed and the basic building block for multibeam MIMO receivers with a reduced area is developed and analyzed.
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Yin, Huiwen, Yue Yu e Zhiping Huang. "DLI-Based DP-QPSK Reception Scheme for Short-Range Optical Communication". Applied Sciences 10, n. 14 (13 luglio 2020): 4815. http://dx.doi.org/10.3390/app10144815.
Testo completoAbstract (sommario):
The unacceptably high cost of digital coherent receivers for short-range optical communication has in recent years fueled the study of alternative transmission schemes that are simultaneously highly performing and cost-effective. However, the proposed solutions (e.g., Kramers–Kronig receiver) usually require the cooperation of a transmitting end, which is unachievable in the context of non-cooperative communication. In this work, we mainly studied a dual-polarization quadrature phase-shift-keying (DP-QPSK) non-coherent reception scheme based on a delay-line interferometer (DLI) and measures to improve the reception performance. A data recovery algorithm was proposed for DLI-based DP-QPSK demodulation. The simulation results demonstrated that the algorithm could accurately recover the raw data from the transmitter. Moreover, decreasing the differential delay of the DLI could effectively increase the chromatic dispersion tolerance of the receiver and the optimal delay scaled inversely with the chromatic dispersion. It was found that a DLI-based DP-QPSK reception scheme is a better choice for short-range, non-cooperative communication with less severe transmission impairments.
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Fromm, Robert, Olfa Kanoun e Faouzi Derbel. "An Improved Wake-Up Receiver Based on the Optimization of Low-Frequency Pattern Matchers". Sensors 23, n. 19 (30 settembre 2023): 8188. http://dx.doi.org/10.3390/s23198188.
Testo completoAbstract (sommario):
Wake-up receivers are gaining importance in power-aware wireless sensor networks, as they significantly reduce power consumption during RF reception, enabling asynchronous communication with low latency. However, the performance of wake-up receivers still lags behind that of off-the-shelf RF transceivers. There is a growing demand for higher sensitivity, enhanced reliability, and lower latency while maintaining the lowest power consumption. In this article, our goal is to advance the performance of wake-up receivers based on off-the-shelf components and low-frequency pattern matchers. Through a systematic investigation, we proposed multiple improvements aimed at enhancing wake-up receiver performance and reliability. We introduced an improved passive envelope detector and realized a wake-up receiver for the 868 MHz band, which achieves a power consumption of 5.71W and latency of 9.02 ms. Our proposed wake-up receiver is capable of detecting signals down to an average power level of −61.6 dBm. These achievements represent significant advancements compared to the existing state of research on wake-up receivers based on low-frequency pattern matchers. Recent articles have not been able to attain such improved values in signal detection, power consumption, and latency.
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Borisov, Vasily. "Amateur Radio Activity in the USSR before World War II". Science Management: Theory and Practice 4, n. 3 (26 settembre 2022): 189–98. http://dx.doi.org/10.19181/smtp.2022.4.3.13.
Testo completoAbstract (sommario):
The article discusses the emergence and development of amateur activities in radio communications and television reception in the USSR. Amateur radio activity in the USSR received legal recognition in 1924. By the end of 1928, more than 450 amateur radio stations were on the air in the country. From the beginning of the 1930s domestic radio amateurs have also mastered the reception of television broadcasts on home-made televisions. By the end of the 1930s. there were a large number of home-made television receivers tuned to the transmission of optical-mechanical television in the country. In this regard, short-line mechanical television broadcasting in the USSR existed until the early 1940s.
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Regis, Carlos D. M., Raissa B. Rocha, Mylene C. Q. Farias e Marcelo S. Alencar. "Objective and Subjective Evaluation of Spatially Transcoded Videos for Mobile Receivers". Journal of Communications Software and Systems 6, n. 2 (21 giugno 2010): 49. http://dx.doi.org/10.24138/jcomss.v6i2.189.
Testo completoAbstract (sommario):
Digital television produces video signals with different bit rates, encoding formats, and spatial resolutions. To deliver video to users with different receivers, the content needs to be dynamically adapted. Transcoding devices convert video from one format into another. The reception of digital videos using mobile receivers, implies that the spatial resolution of the video must be adjusted to fit the small display. This paper presents subjective and objective quality analysis of spatially transcoded videos. Transcoding algorithms that downsample the video frames using the moving average, median, mode, weighted average and sigma filters are considered.
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Fayadh, Rashid Ali, Mohd Fareq Abd Malek, Hilal Adnan Fadhil e Norshafinash Saudin. "Performance Evaluation of Adaptive Indoor Matched Rake Receiver Using Multiple-Combining Techniques". Applied Mechanics and Materials 699 (novembre 2014): 921–30. http://dx.doi.org/10.4028/www.scientific.net/amm.699.921.
Testo completoAbstract (sommario):
This paper discusses the enhancement of the wireless rake receiver for high speed and short distance indoor ultra wideband (UWB) propagation with line-of sight (LOS) and non line-of sight (NLOS) channel models. The proposed matched rake receiver uses three main combining techniques, maximum ratio combining (MRC), equal gain combining (EGC), and selective combining (SC) to capture most of the energy of the multi-path components (MPCs). When the wireless communication systems work with high capacity and high speed in transmission and reception scenarios, there will be a serious challenge defined as inter-symbol interference (ISI) during the reception process. The ISI causes increasing in the bit error rate (BER) when the wireless communication systems work with high bit rate propagation. The matched rake receiver scheme was designed to suppress ISI by maximizing the signal to noise ratio (SNR) before constructing the desired signal in decision circuit and effectively the system enhancement is improved. After adding additive white Gaussian noise (AWGN) to the received signal, the improvement is cleared comparing with the theoretical results that has no AWGN. During the comparison of the simulation results, MRC partial rake receiver of less complexity showed better performance than the EGC and SC rake receivers.
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Burciu, Ioan, Guillaume Villemaud, Jacques Verdier e Matthieu Gautier. "Low power front-end architecture dedicated to the multistandard simultaneous reception". International Journal of Microwave and Wireless Technologies 2, n. 6 (dicembre 2010): 505–14. http://dx.doi.org/10.1017/s1759078710000735.
Testo completoAbstract (sommario):
In this paper, we address the architecture of multistandard simultaneous reception receivers and we aim to reduce the complexity and the power consumption of the analog front-end. To this end, we propose an architecture using the double orthogonal translation technique in order to multiplex two signals received on different frequency bands. A study case concerning the simultaneous reception of 802.11 g and Universal Mobile Telecommunications System (UMTS) signals is developed in this article. Theoretical and simulation results show that this type of multiplexing does not significantly influence the evolution of the signal-to-noise ratio of the signals. In the same time a 30% reduction of the power consumption is expected as well as a significant reduction of the complexity.
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Zhang, Bo, Christian Malouin e Theodore J. Schmidt. "Towards full band colorless reception with coherent balanced receivers". Optics Express 20, n. 9 (19 aprile 2012): 10339. http://dx.doi.org/10.1364/oe.20.010339.
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Ibrahim, M. M., e A. M. Ibrahim. "Performance analysis of optical receivers with space diversity reception". IEE Proceedings - Communications 143, n. 6 (1996): 369. http://dx.doi.org/10.1049/ip-com:19960885.
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Song, Yingchen, Yanyu Zhang, Xiaoxiao Du, Xiaojing Wang e Yijun Zhu. "Research on Efficient Handover Mechanism for Cubic Receiver in Visible Light Communication". Electronics 12, n. 3 (31 gennaio 2023): 701. http://dx.doi.org/10.3390/electronics12030701.
Testo completoAbstract (sommario):
Visible light communication (VLC) has the advantages of rich spectrum resources, endogenous safety and anti-electromagnetic interference, so the application of VLC to the Industrial Internet of Things is one of its current development directions. Due to the limited coverage of light emitting diodes (LEDs), dense placement is often required in industrial manufacturing scenarios. However, mobile users will face frequent handover between these LEDs, and reliable reception of signals on mobile terminals requires receivers with a large detection area. In this paper, we used a cubic receiver to increase the detection area, which is more conducive to signal reception than a single photo-detector plane receiver. Then we studied the handover scheme for a cubic receiver to ensure the performance of the communication link. We also rotated the receiver to further improve signal quality and obtain the optimal rotation angles using a genetic algorithm with low complexity. The results show that a cubic receiver has a better received signal quality than a plane receiver, and rotation can enhance the signal quality more. In addition, it can be seen that the handover for the cubic receiver depends not only on the distance, but also on its structure, angle and position. Considering these factors jointly when performing a handover, users can connect to LEDs, which provide the best quality of service, and system communication performance can be improved.
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Xie, Peng, e Mark G. Petovello. "Improved Correlator Peak Selection for GNSS Receivers in Urban Canyons". Journal of Navigation 68, n. 5 (26 marzo 2015): 869–86. http://dx.doi.org/10.1017/s037346331500017x.
Testo completoAbstract (sommario):
Multipath arises from the reception of reflected or diffracted signals in addition to the Line-Of-Sight (LOS) signal. By using a block processing high sensitivity receiver scheme, this paper aims to obtain better positioning performance in urban canyon areas. Generally, the peak with the most power is utilised in high sensitivity receivers; however, this approach is not always optimal in multipath environments. Noting that signal correlation peaks may be separated in the Doppler domain by a long coherent integration time, a peak identification scheme is proposed in this work, which yields better positioning performance. It is shown that most of the multipath peaks are removed in the receiver after using the proposed algorithm.
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Bažec, Matej, Franc Dimc e Polona Pavlovčič-Prešeren. "Evaluating the Vulnerability of Several Geodetic GNSS Receivers under Chirp Signal L1/E1 Jamming". Sensors 20, n. 3 (3 febbraio 2020): 814. http://dx.doi.org/10.3390/s20030814.
Testo completoAbstract (sommario):
Understanding the factors that might intentionally influence the reception of global navigation satellite system (GNSS) signals can be a challenging topic today. The focus of this research is to evaluate the vulnerability of geodetic GNSS receivers under the use of a low-cost L1/E1 frequency jammer. A suitable area for testing was established in Slovenia. Nine receivers from different manufacturers were under consideration in this study. While positioning, intentional 3-minute jammings were performed by a jammer that was located statically at different distances from receivers. Furthermore, kinematic disturbances were performed using a jammer placed in a vehicle that passed the testing area at various speeds. An analysis of different scenarios indicated that despite the use of an L1/E1 jammer, the GLONASS (Russian: Globalnaya Navigatsionnaya Sputnikovaya Sistema) and Galileo signals were also affected, either due to the increased carrier-to-noise-ratio (C/N0) or, in the worst cases, by a loss-of-signal. A jammer could substantially affect the position, either with a lack of any practical solution or even with a wrong position. Maximal errors in the carrier-phase positions, which should be considered a concern for geodesy, differed by a few metres from the exact solution. The factor that completely disabled the signal reception was the proximity of a jammer, regardless of its static or kinematic mode.
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Khakimov, Ortagoli. "Immersion ultrasonic transducers". Ukrainian Metrological Journal, n. 2 (2 luglio 2021): 25–29. http://dx.doi.org/10.24027/2306-7039.2.2021.236076.
Testo completoAbstract (sommario):
The principles of operation and design of immersion ultrasonic transducers developed by the authors for excitation and reception of elastic vibrations in moving filament-like and plane-parallel materials, in particular, polymer fibbers and films, with an adjustable angle of input (reception) of probing signals into moving controlled object – polymer fibbers and films at normal and high temperatures.
The technical characteristics of the installation are given in which the converters developed by us are used, namely, sounding base (distance from the emitter to the receivers), the duration of the probing pulses, the frequency of filling and the duration of the probing pulses, the speed of the controlled object, the combined standard measurement uncertainties of the difference Δt of the propagation times of ultrasonic waves from the emitter to the first and second signal receivers, relative combined standard uncertainties of measurements of attenuation coefficient and velocity of propagation of ultrasonic waves.
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Hussain, Arif, Hina Magsi, Arslan Ahmed, Hadi Hussain, Zahid Hussain Khand e Faheem Akhtar. "The effects of using variable lengths for degraded signal acquisition in GPS receivers". International Journal of Electrical and Computer Engineering (IJECE) 11, n. 4 (1 agosto 2021): 3201. http://dx.doi.org/10.11591/ijece.v11i4.pp3201-3211.
Testo completoAbstract (sommario):
The signal acquisition in GPS receivers is the first and very crucial process that may affect the overall performance of a navigation receiver. Acquisition program initiates a searching operation on received navigation signals to detect and identify the visible satellites. However, signal acquisition becomes a very challenging task in a degraded environment (i.e, dense urban) and the receiver may not be able to detect the satellites present in radio-vicinity, thus cannot estimate an accurate position solution. In such environments, satellite signals are attenuated and fluctuated due to fading introduced by Multipath and NLOS reception. To perform signal acquisition in such degraded environments, larger data accumulation can be effective in enhancing SNR, which tradeoff huge computational load, prolonged acquisition time and high cost of receiver. This paper highlights the effects of fading on satellite signal acquisition in GPS receiver through variable data lengths and SNR comparison, and then develops a statistical relationship between satellite visibility and SNR. Furthermore it also analyzes/investigates the tradeoff between computation load and signal data length.
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Chen, Jiang Bo, Yan Li, Cai Lian Xue e Shao Qing Wang. "Research of the Best Receive Principle Based the Binary Knowing Signal". Applied Mechanics and Materials 313-314 (marzo 2013): 1247–51. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.1247.
Testo completoAbstract (sommario):
the best reception technologyis an important part of communication technology ,this article starting fromthe perspective of improving receivers,mainly analyzes how to make the maximumprobability of correct signals,and minimize the probability of error signalunder the same channel noise conditions,which means the best reception.And give thebinary knowing signal in the white noise of the channel under the condition ofthe best receive structure and principle,filter to accept, analysis ofcommunication technology theoretical research and practical application is verysignificant.
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Hassantabar Bozroudi, Seyed Hossein, Daniele Ciani, Mahdi Mohammad Mahdizadeh, Mohammad Akbarinasab, Ana Claudia Barbosa Aguiar, Alvaro Peliz, Bertrand Chapron, Ronan Fablet e Xavier Carton. "Effect of Subsurface Mediterranean Water Eddies on Sound Propagation Using ROMS Output and the Bellhop Model". Water 13, n. 24 (16 dicembre 2021): 3617. http://dx.doi.org/10.3390/w13243617.
Testo completoAbstract (sommario):
Ocean processes can locally modify the upper ocean density structure, leading to an attenuation or a deflection of sound signals. Among these phenomena, eddies cause significant changes in acoustic properties of the ocean; this suggests a possible characterization of eddies via acoustics. Here, we investigate the propagation of sound signals in the Northeastern Atlantic Ocean in the presence of eddies of Mediterranean Water (Meddies). Relying on a high-resolution simulation of the Atlantic Ocean in which Meddies were identified and using the Bellhop acoustic model, we investigated the differences in sound propagation in the presence and absence of Meddies. Meddies create sound channels in which the signals travel with large acoustic energy. The transmission loss decreases to 80 or 90 dB; more signals reach the synthetic receivers. Outside of these channels, the sound signals are deflected from their normal paths. Using receivers at different locations, the acoustic impact of different Meddies, or of the same Meddy at different stages of its life, are characterized in terms of angular distributions of times of arrivals and of energy at reception. Determining the influence of Meddies on acoustic wave characteristics at reception is the first step to inverting the acoustic signals received and retrieving the Meddy hydrological characteristics.
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Takahashi, Satoshi. "Method for Determining Broadcaster Advised Emergency Wake-up Signal for ISDB-T Digital Television Receivers". Journal of Telecommunications and Information Technology 1 (29 marzo 2019): 103–12. http://dx.doi.org/10.26636/jtit.2019.131619.
Testo completoAbstract (sommario):
There is a way to automatically wake up television receivers when a broadcaster sends out an emergency alert. In the Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) digital television standard, the emergency wake-up procedure is called an Emergency Warning System (EWS). In ISDB-T, the special signal is embedded in a control message known as transmission and modulation configuration control (TMCC). However, improper identification of the wake-up signal, often encountered in mobile reception, leads to unnecessary wake ups. In this paper, a method of reliably determining a wake-up signal is proposed by assuming that broadcasters will not change the TMCC message except for the wake-up signal when the broadcaster sends out an emergency alert. A change in the wake-up bit leads to variation parity, and the proposed method also relies on such variations. Mutual information to be obtained by the wake-up receiver is evaluated using the memoryless binary asymmetric channel model. Results showed that the proposed method provided mutual information even at a Eb/N₀ being lower than 10 dB. Mutual information of the proposed method with intermittent reception is also analyzed as a function of the duty ratio of the intermittent receiver.
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Xiang, Wei, Shao Jie Ni, Wei Wu e Fei Xue Wang. "Analysis of Adaptive Detection Threshold for High Sensitivity Compass Navigation Receiver". Applied Mechanics and Materials 239-240 (dicembre 2012): 489–93. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.489.
Testo completoAbstract (sommario):
Compared with fixed detection threshold, adaptive detection threshold substantially improves the reception sensitivities in high sensitivity receivers. The optimal detection threshold depends on probability distribution of the received signals. The out-of-phase auto correlation values and cross correlation values of Chinese Compass B1-I signal were analyzed, and the probability distribution of the signal with the differential correlation technique was provided. Then the optimal detection threshold and the sensitivity gain that can be obtained by the adaptive detection threshold were provided.
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Tomaštík, Julián, e Tim Everett. "Static Positioning under Tree Canopy Using Low-Cost GNSS Receivers and Adapted RTKLIB Software". Sensors 23, n. 6 (15 marzo 2023): 3136. http://dx.doi.org/10.3390/s23063136.
Testo completoAbstract (sommario):
The decrease in costs and dimensions of GNSS receivers has enabled their adoption for a very wide range of users. Formerly mediocre positioning performance is benefiting from recent technology advances, namely the adoption of multi-constellation, multi-frequency receivers. In our study, we evaluate signal characteristics and horizontal accuracies achievable with two low-cost receivers—a Google Pixel 5 smartphone and a u-Blox ZED F9P standalone receiver. The considered conditions include open area with nearly optimal signal reception, but also locations with differing amounts of tree canopy. GNSS data were acquired using ten 20 min observations under leaf-on and leaf-off conditions. Post-processing in static mode was conducted using the Demo5 fork of the RTKLIB open source software, which is adapted for usage with lower quality measurement data. The F9P receiver provided consistent results with sub-decimeter median horizontal errors even under tree canopy. The errors for the Pixel 5 smartphone were under 0.5 m under open-sky conditions and around 1.5 m under vegetation canopy. The adaptation of the post-processing software to lower quality data was proven crucial, especially for the smartphone. In terms of signal quality (carrier-to-noise density, multipath), the standalone receiver provided significantly better data than the smartphone.
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Hassanien, Jasmien. "Multi-GNSS Software Receiver Design Optimization for Accuracy Improvement". International Journal for Research in Applied Science and Engineering Technology 9, n. 9 (30 settembre 2021): 1467–76. http://dx.doi.org/10.22214/ijraset.2021.38190.
Testo completoAbstract (sommario):
Abstract: Recently, tremendous research has been conducted on Global navigation satellite systems (GNSS) software receivers to better serve the current challenging environments that suffers from multipath fading. Therefore, the development of GNSS receivers has seen a new rush toward a multi-GNSS as a solution for fading problems. In this paper, a multi-GNSS software receiver is designed, optimized, and its performance is presented. The implemented software receiver covers three different signals from two GNSS constellations, namely GPS L1, GPS L2, and Galileo E1. In this paper. the fundamentals of stages of GNSS signal reception (acquisition, tracking, and navigation) are discussed where each stage is customized and optimized for each considered signal and the stage of mutli-GNSS data combination is optimized afterword. The performance of the optimized multi-GNSS software receiver is examined under different combination scenarios where the Least-Square Estimation (LSE) method using precise positioning (PP) algorithms is adopted. Results showed that using multi-GNSS receiver enhances the accuracy of Position, Velocity, and Timing (PVT) solution. Keywords: GNSS, PVT, GPS, Galileo, and accuracy
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Campbell, Philip. "Understanding the receivers and the reception of science's uncertain messages". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, n. 1956 (13 dicembre 2011): 4891–912. http://dx.doi.org/10.1098/rsta.2011.0068.
Testo completoAbstract (sommario):
Although much work has been done by scientists in developing communications to non-scientist audiences, much less attention has been given by them to the ways in which those messages are interpreted. Here, I look at the published work that examines the issue. I focus on three contexts in particular: debates over the triple vaccine for measles, mumps and rubella, the impacts of the Soufrière Hills volcano on the inhabitants of the island of Montserrat and the public communication of the results of climate change research. Several common themes emerge. The most important conclusions are that scientists communicating with the public need to develop their methods deliberatively, involving their target audiences; and that they need to avoid undue dependence on traditional media and public authorities for such communication, and to develop multiple channels to those audiences, including Internet-based and more traditional social networks. Their approach to communicating uncertainty should depend on the context but, except in some extreme emergencies, transparency is generally a virtue. Above all, they need to persist in such public engagements even when the going is rough and extends over long periods. They need support in doing so.
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Chang, Z., P. Lyu e B. Peng. "Differentiated Reception Modes Based Multiple Access". Wireless Communications and Mobile Computing 2022 (11 ottobre 2022): 1–9. http://dx.doi.org/10.1155/2022/5328007.
Testo completoAbstract (sommario):
In recent years, the continuous increase in wireless data services and users’ traffic demand has been imposing great challenges on traditional multiple access control (MAC) methods. Some existing MAC techniques improve the communication system’s spectral efficiency (SE) via signal processing based cochannel interference (CCI) management. However, no interference management (IM) is free, i.e., its realization is based on the consumption of some communication resources, such as power and degree-of-freedom (DoF), which can also be used for the user’s desired data transmission. To lessen the resource cost for IM-based MAC, we exploit interactions among multiple wireless signals to propose a new MAC method, namely, Differentiated Reception Modes based Multiple Access (DRM-MA), in this paper. Under DRM-MA, a central control unit (CCU) is adopted to manage and pair multiple transmitting antennas with their serving receivers (Rxs). The CCU first calculates the phase difference of signals sent from each candidate antenna and perceived by the two receiving antennas of an Rx based on the locations of the transmitting antenna and Rx. Then, the CCU selects and pairs a proper transmitting antenna with each Rx, so that various Rxs can adopt either additive or subtractive reception mode to postprocess the signals received by its two antennas to realize in-phase desired signal construction and inverse-phase interference destruction. DRM-MA can avoid transmission performance loss incurred by signal processing-based IM. Our theoretical analysis and simulation results have shown that DRM-MA can enable concurrent data transmissions of multiple antenna-receiver pairs and output a high system’s SE.
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Qi, Gaohan, Shengxiang Zhang, Shijie Feng e Yanfeng Fu. "Improvement of high sensitivity ICR characteristics and its application in OFDR". Journal of Physics: Conference Series 2722, n. 1 (1 marzo 2024): 012003. http://dx.doi.org/10.1088/1742-6596/2722/1/012003.
Testo completoAbstract (sommario):
Abstract Coherent optical sensing technology faces significant challenges in practical applications due to the extremely weak signal light, necessitating highly sensitive coherent receivers. A high-sensitivity, highly integrated, and low-noise coherent receiver module based on germanium-silicon photonic chips has been developed. A testing system was constructed to assess the performance of the coherent receiver module, revealing a reception sensitivity of -70dBm, with physical dimensions of 33×40×8.6 mm3 and an output noise voltage of ±4mV. Additionally, a distributed sensing system based on optical frequency domain reflectometry (OFDR) was established to verify the module’s application in OFDR systems, achieving a spatial resolution of 1mm.
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Klatser, Paul, Marc Van Der Vossen, Gerard Voshaar, Rinus Boot, Adriaan Hulzinga, Maikel Iven e Chris Roeloffzen. "An ultra flat phased array Ku-band antenna with integrated receivers in SiGe BiCMOS". International Journal of Microwave and Wireless Technologies 7, n. 3-4 (giugno 2015): 379–89. http://dx.doi.org/10.1017/s1759078715000999.
Testo completoAbstract (sommario):
A highly integrated Ku-band (10.7–12.75 GHz) planar phased array receiver of 64 antenna elements is presented. It features instantaneous reception of the full Ku-band (2.05 GHz wide) in two orthogonal polarizations with wide scan angles by using time delay instead of phase shift. The receiver is part of a system for satellite broadcast TV reception on board of moving vehicles. Two SiGe radio frequency integrated circuits (RFICs) were developed, packaged in ceramic BGAs and assembled onto a 15-layer printed circuit board (PCB) which integrates the antenna elements. An outline of the system is given along with a detailed description. It sets a new standard in integration density. The receiver has extensive analog signal processing at intermediate frequency (IF)-level. A novel bipolar implementation for true time delay is proposed, with a continuous programmable delay range of 0…80 ps with less than 2.5 ps group-delay variation in 2 GHz bandwidth (BW). The wide BW calls for a constant group-delay implementation in the IF chain. The receiver (RFIC) consumes only 132 mW per channel. Each channel has 40 dB gain.
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Ghosh, Bikramaditya, Hayfa Kazouz e Zaghum Umar. "Do Automated Market Makers in DeFi Ecosystem Exhibit Time-Varying Connectedness during Stressed Events?" Journal of Risk and Financial Management 16, n. 5 (28 aprile 2023): 259. http://dx.doi.org/10.3390/jrfm16050259.
Testo completoAbstract (sommario):
We investigate the connectedness of automated market makers (AMM) that play a pivotal role in liquidity and ease of operations in the decentralized exchange (DEX). By applying the TVP-VAR model, our findings show higher level of connectivity during periods of turmoil (such as Delta, Omicron variants of SARS-Covid, and the Russia Ukraine conflict). Furthermore, risk transmission/reception is found to be independent of the platform on which they typically run (Ethereum based AMMs were both emitters as well as receivers). Pancake (a Binance based AMM) and Perpetual Protocol (Ethereum based AMM) emerged as moderate to high receivers of risk transmission, whereas all of the other AMMs, including Ethereum, were found to be risk emitters at varying degrees. We argue that AMMs typically depend on the underlying smart contracts. If the contract is flexible, AMMs can vary (either receiver or emitter), otherwise AMMs behave in tandem.
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Andress, K., e E. Downey. "(A146) Disaster Patient Tracking – Local, State and Federal Interoperability during a Multi-Hospital Evacuation Exercise". Prehospital and Disaster Medicine 26, S1 (maggio 2011): s42. http://dx.doi.org/10.1017/s1049023x11001476.
Testo completoAbstract (sommario):
IntroductionAssociated with hospital evacuation is the need to track multiple patient evacuees from point of origination to final hospital reception. Patient tracking, a component of the hospital emergency operations plan, is vital to patient care; family association, resource management, financial reimbursement, risk management, and repatriation. Tracking strategies and plans can include a variety of vendors, hardware, software, and coordination issues. Hospital evacuee tracking plans and platforms exist at multiple jurisdictional levels but may not be interoperable.MethodsThree patient tracking platforms representing a local, state and federal application were used during a multi-hospital evacuation exercise, initiated in New Orleans, Louisiana, May 2010. Simulated patients were flown and tracked to multiple patient reception centers in the southern United States, including the Federal Coordinating Center in Shreveport, Louisiana, and receiving National Disaster Medical System hospitals. This review summarizes tracking operations, patient data characteristics captured and interoperability at the Shreveport reception location.Results7 New Orleans hospitals entered 51 patients for evacuation into Louisiana's web-based, At-Risk-Registry (ARR) database including 8 patient identifiers each. ARR data was shared with federal and Louisiana Region 7 patient evacuee receivers for flight manifest construction and reception planning. 34 ARR evacuee patients were indicated for the Shreveport, Louisiana, reception site. 34 patients with 6 identifying characteristics were entered from ARR into EMTrack, the local patient tracking system. A C130 arrived with a TRAC2ES manifest of 20 simulated patients with 6 patient data characteristics. The local tracking system was reconfigured for the hardcopy manifest; simulated patients were received at the airport; transported and received at local hospitals.ConclusionsTracking system interoperability may be challenged by tracking technologies, jurisdictional requirements and degree of implementation at the local, state and federal level. Tracking should be standardized based on national recommendations with local systems remaining flexible for just-in-time requirements.
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Pieniz, Mônica. "Structural mediation of technicity: audiences repositioning on Twitter". Matrizes 9, n. 1 (23 giugno 2015): 213. http://dx.doi.org/10.11606/issn.1982-8160.v9i1p213-228.
Testo completoAbstract (sommario):
This paper presents elements of a PhD thesis that had the objective of understanding the process of audiences repositioning where receivers become emitters by sharing their perceptions about telenovela on Twitter. The research sought to discover the motivations and contents involved in this practice, from the theoretical approach of structural mediation of technicity. The methodological protocol included content analysis of tweets, on Nvivo10 software, questionnaires and interviews with twitterers receivers. The results show different contents and motivations, which evidence that, besides being a reception shared via web, this is a practice of individuals that seek to please their own possible audience.
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Şişman, İsmail, e Korkut Yeğin. "Reconfigurable Antenna for Jamming Mitigation of Legacy GPS Receivers". International Journal of Antennas and Propagation 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/4563571.
Testo completoAbstract (sommario):
We propose a simple solution for jamming mitigation of L1 band GPS by electronically switching antenna beam for wide and narrow beamwidths. Assuming the jamming signal is directed from low elevation angles, antenna reception can be made significantly lower at these angles by electronically reconfiguring the antenna beamwidth. Four-element antenna array and one of the elements of the array are designated as antijam (array) mode and normal mode of the antenna. The antenna is placed on a degenerate-ground with symmetric slots in the ground. Front-end configuration for this antenna is also discussed. Simulations and measurements are performed to validate the proposed design. The antenna achieves more than 15 dB rejection in measurements and more than 20 dB cross-polarization improvement compared to standalone (normal mode) antenna. The system can easily be replaced with existing active antenna to improve antijam capability of the receiver.
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López, Eduardo, Ignacio Díez-Vega e Juan José Molina. "Effect of serve on reception and side-out performance in relation to ball´s contact with the net and type of serve, in high level male volleyball. [Efecto del saque en el rendimiento de la recepción y en el complejo I en función del contacto del balón con la red y el tipo de saque, en voleibol]." RICYDE. Revista internacional de ciencias del deporte 17, n. 63 (1 gennaio 2021): 56–68. http://dx.doi.org/10.5232/ricyde2021.06305.
Testo completoAbstract (sommario):
The contact of the serve’s ball with the net in volleyball generates uncertainty in the receivers, due to the change in trajectory and speed that occurs. The objective of this study was to determine the influence of the serve contact with the net on the performance of the receiving team, on male teams of the highest international level. A total of 4,227 actions of reception or side-out corresponding to 29 matches were analysed, of which only 275 contacted the net (5.42%). Reception performance was higher in the power jump serves that contacted with the net (p<0.001). However, the effect of contact with the net on floating serves did not have a significant impact. The final performance of the side-out did not make a significant impact neither. In conclusion, the contact of the ball with the net affects the reception performance in the highest international men's volleyball teams.
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Reed, Charlotte M., Lorraine A. Delhorne, Nathaniel I. Durlach e Susan D. Fischer. "A Study of the Tactual and Visual Reception of Fingerspelling". Journal of Speech, Language, and Hearing Research 33, n. 4 (dicembre 1990): 786–97. http://dx.doi.org/10.1044/jshr.3304.786.
Testo completoAbstract (sommario):
A method of communication in frequent use among members of the deaf-blind community is the tactual reception of fingerspelling. In this method, the hand of the deaf-blind individual is placed on the hand of the sender to monitor the handshapes and movements associated with the letters of the manual alphabet. The purpose of the current study was to examine the ability of experienced deaf-blind subjects to receive fingerspelled materials, including sentences and connected text, through the tactual sense. A parallel study of the reception of fingerspelling through the visual sense was also conducted using sighted deaf subjects. For both visual and tactual reception of fingerspelled sentences, accuracy of reception was examined as a function of rate of presentation. In the tactual study, where rates were limited to those that could be produced naturally by an experienced interpreter, highly accurate reception of conversational sentence materials was observed throughout the range of naturally produced rates (i.e., 2 to 6 letters/s). In the visual study, rates in excess of those that can be produced naturally were achieved through variable-speed playback of videotapes of fingerspelled sentences. The results of this study indicate that performance varies systematically as a function of rate of presentation, with scores of 50% correct on conversational sentences obtained at rates of 12 to 16 letters/s (i.e., rates roughly double to triple normal speed). These results suggest that normal communication rates for the visual reception of fingerspelling are restricted by limitations on the rate of manual production. Although maximal rates of natural manual production of fingerspelling correspond to the presentation of a new handshape on the order of once every 150–200 ms, the data from the sped-up visual study suggest that experienced receivers of visual fingerspelling are able to receive sentences at substantially higher rates of fingerspelling (which are, in fact, comparable to communication rates for spoken English).
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Taylor, Brian. "Gender in Sarawak: Mission and Reception". Studies in Church History 34 (1998): 461–73. http://dx.doi.org/10.1017/s0424208400013814.
Testo completoAbstract (sommario):
The interaction of gender and religion affects a developing as much as a developed church. A missionary church raises appropriate issues not merely as they affect those spreading the message, but as they affect the receivers, both immediately and in a later period of establishment. This paper deals with such matters as they appear in the history of the Anglican Church in Sarawak, where the missionary activity began in 1848.
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Deepa, R., e Dr K. Baskaran. "Mimo Based Efficient JPEG Image Transmission and Reception by Multistage Receivers". International Journal of Computer Applications 1, n. 15 (25 febbraio 2010): 13–23. http://dx.doi.org/10.5120/329-499.
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Abdukarimova, Zh, e Z. Saktaganova. "The role of children’s reception centers in the fight against child homelessness and neglect in the Kazakh SSR during the war years (1941-1945)". Bulletin of the L.N. Gumilyov Eurasian National University. Historical Sciences. Philosophy. Religion Series 145, n. 4 (2023): 8–25. http://dx.doi.org/10.32523//2616-7255-2023-145-4-8-25.
Testo completoAbstract (sommario):
Children's reception centers-distributors of the NKVD during the Great Patriotic War played an important role in the fight against child neglect and homelessness. Their work helped to streamline the process of distributing Soviet children to children's institutions of the People's Commissariat for Health, the People's Commissariat for Education, and the People's Commissariat for Social Welfare. The article deals with the work of children's reception centers in the Kazakh SSR in 1941-1945. On the basis of data from domestic and foreign archives, the authors show that child homelessness and neglect had a constant dynamic of growth during the war years, which became a huge problem of state scale. One of the elements of solving this problem was the mass work of children's reception centers-distributors of the NKVD. The number of receivers in the republic was growing, as was their capacity. The authors have identified the main sources of minors' admission to NKVD reception centers, the reasons why children were most often placed in difficult living conditions and their further placement. The authors also study the conditions of children's stay in reception centers by regions of the Kazakh SSR. As well as problems related to the supply of food and clothing allowances, schooling and medical care for children in reception centers. The novelty of the work lies in the fact that the problems of functioning of children's reception centers-distributors of the NKVD in the Kazakh SSR, as a measure to combat homelessness and neglect, are considered by the authors on the basis of previously unused archival documents