Bibliographies thématiques / Channel adaptation

Littérature scientifique sur le sujet « Channel adaptation »

Auteur : Grafiati
Publié le 25 mai 2024

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Articles de revues sur le sujet "Channel adaptation"

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Ricci, Anthony. « Differences in Mechano-Transducer Channel Kinetics Underlie Tonotopic Distribution of Fast Adaptation in Auditory Hair Cells ». Journal of Neurophysiology 87, no 4 (1 avril 2002) : 1738–48. http://dx.doi.org/10.1152/jn.00574.2001.

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The first step in audition is a deflection of the sensory hair bundle that opens mechanically gated channels, depolarizing the sensory hair cells. Two mechanism of adaptation of mechano-electric transducer (MET) channels have been identified in turtle auditory hair cells. The rate of fast adaptation varies tonotopically and is postulated to underlie a mechanical tuning mechanism in turtle auditory hair cells. Fast adaptation is driven by a calcium-dependent feedback process associated with MET channels. The purpose of this paper is to test the hypothesis that fast adaptation contributes to MET channel kinetics and that variations in channel kinetics underlie the tonotopic distribution of fast adaptation. To test for kinetic differences, the open channel blocker dihydrostreptomycin (DHS) was used. DHS blocked MET currents from low-frequency cells (IC50 = 14 ± 2 μM) more effectively than high-frequency cells (IC50 = 75 ± 5 μM), suggesting differences in MET channel properties. DHS block showed similar calcium sensitivities at both papilla locations. No difference in calcium permeation or block of the transducer channels was observed, indicating that the DHS effect was not due to differences in the channel pore. Slowing adaptation increased DHS efficacy, and speeding adaptation decreased DHS efficacy, suggesting that adaptation was influencing DHS block. DHS block of MET channels slowed adaptation, most likely by reducing the peak intraciliary calcium concentration achieved, supporting the hypothesis that the rate of adaptation varies with the calcium load per stereocilia. Another channel blocker, amiloride showed similar efficacy for high- and low-frequency cells with an IC50 of 24.2 ± 0.5 μM and a Hill coefficient of 2 but appeared to block high-frequency channels faster than low-frequency channels. To further explore MET channel differences between papilla locations, stationary noise analysis was performed. Spectral analysis of the noise gave half power frequencies of 1,185 ± 148 Hz ( n = 6) and 551 ± 145 Hz ( n = 5) for high- and low-frequency cells in 2.8 mM external calcium. The half power frequency showed similar calcium sensitivity to that of adaptation shifting to 768 ± 205 Hz ( n = 4) and 289 ± 63 Hz ( n = 4) for high- and low-frequency cells in 0.25 mM external calcium. Both the pharmacological data and the noise analysis data are consistent with the hypothesis that the tonotopic distribution of fast adaptation is in part due to differences in MET channel kinetics. An increase in the number of MET channels per stereocilia (termed summation) and or intrinsic differences in MET channel kinetics may be the underlying mechanism involved in establishing the gradient.
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Small, D. L., et C. E. Morris. « Delayed activation of single mechanosensitive channels in Lymnaea neurons ». American Journal of Physiology-Cell Physiology 267, no 2 (1 août 1994) : C598—C606. http://dx.doi.org/10.1152/ajpcell.1994.267.2.c598.

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Some stretch-activated (SA) channels challenged with suction jumps exhibit adaptation, a dynamic behavior that can be overlooked because of its mechanical fragility. In previous studies of neuronal SA K channels, we detected no adaptation, but the protocols used were not designed to detect dynamics. Here, we reproduce the adaptation seen by others in Xenopus SA cationic (Cat) channels but show that, with the same protocol, no adaptation occurs with SA K channels. Instead, SA K channels exhibit a different dynamic behavior, delayed activation. Lymnaea SA K channels subjected to pressure jumps responded after a 1- to 4-s delay with a gradual, rather than abrupt, onset of activation. The delay was pressure dependent and was longer for patches from older cultured neurons. Delayed responses were fragile like SA Cat channel adaptation; they disappeared with repeated stimuli. Cytochalasin D decreased the delay and increased the stretch activation of SA K channels. Unlike SA Cat channel adaptation, which occurs only at hyperpolarized potentials, SA K channel delay was not voltage dependent. We note that once SA Cat and SA K channels are "stripped" of their fragile (cytoskeleton-dependent?) dynamics, however, their gating behaviors show little fundamental difference; both are stretch activatable and have a higher open probability at depolarized potentials.
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Geiser, Florian, Daniel Wessel, Matthias Hummert, Andreas Weber, Dirk Wübben, Armin Dekorsy et Alberto Viseras. « DRLLA : Deep Reinforcement Learning for Link Adaptation ». Telecom 3, no 4 (23 novembre 2022) : 692–705. http://dx.doi.org/10.3390/telecom3040037.

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Link adaptation (LA) matches transmission parameters to conditions on the radio link, and therefore plays a major role in telecommunications. Improving LA is within the requirements for next-generation mobile telecommunication systems, and by refining link adaptation, a higher channel efficiency can be achieved (i.e., an increased data rate thanks to lower required bandwidth). Furthermore, by replacing traditional LA algorithms, radio transmission systems can better adapt themselves to a dynamic environment. There are several drawbacks to current state-of-the-art approaches, including predefined and static decision boundaries or relying on a single, low-dimensional metric. Nowadays, a broadly used approach to handle a variety of related input variables is a neural network (NN). NNs are able to make use of multiple inputs, and when combined with reinforcement learning (RL), the so-called deep reinforcement learning (DRL) approach emerges. Using DRL, more complex parameter relationships can be considered in order to recommend the modulation and coding scheme (MCS) used in LA. Hence, this work examines the potential of DRL and includes experiments on different channels. The main contribution of this work lies in using DRL algorithms for LA, optimized for throughput based on a subcarrier observation matrix and a packet success rate feedback system. We apply Natural Actor-Critic (NAC) and Proximal Policy Optimization (PPO) algorithms on simulated channels with a subsequent feasibility study on a prerecorded real-world channel. Empirical results produced by experiments on the examined channels hint that Deep Reinforcement Learning for Link Adaptation (DRLLA) offers good performance indicated by a promising data rate on the additive white Gaussian noise (AWGN) channel, the non-line-of-sight (NLOS) channel, and a prerecorded real-world channel. No matter the channel impairment, the agent is able to respond to changing signal-to-interference-plus-noise-ratio (SINR) levels, as exhibited by expected changes in the effective data rate.
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Yang, Ge, Chao Zhang, Ling Gao, Yufei Guo et Jinyang Guo. « Domain Adaptive Channel Pruning ». Electronics 13, no 5 (26 février 2024) : 887. http://dx.doi.org/10.3390/electronics13050887.

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Domain adaptation is an effective approach to improve the generalization ability of deep learning methods, which makes a deep model more stable and robust. However, these methods often suffer from a deployment problem when deep models are deployed on different types of edge devices. In this work, we propose a new channel pruning method called Domain Adaptive Channel Pruning (DACP), which is specifically designed for the unsupervised domain adaptation task, where there is considerable data distribution mismatch between the source and the target domains. We prune the channels and adjust the weights in a layer-by-layer fashion. In contrast to the existing layer-by-layer channel pruning approaches that only consider how to reconstruct the features from the next layer, our approach aims to minimize both classification error and domain distribution mismatch. Furthermore, we propose a simple but effective approach to utilize the unlabeled data in the target domain. Our comprehensive experiments on two benchmark datasets demonstrate that our newly proposed DACP method outperforms the existing channel pruning approaches under the unsupervised domain adaptation setting.
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Wichmann, Lukas, et Mike Althaus. « Evolution of epithelial sodium channels : current concepts and hypotheses ». American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 319, no 4 (1 octobre 2020) : R387—R400. http://dx.doi.org/10.1152/ajpregu.00144.2020.

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The conquest of freshwater and terrestrial habitats was a key event during vertebrate evolution. Occupation of low-salinity and dry environments required significant osmoregulatory adaptations enabling stable ion and water homeostasis. Sodium is one of the most important ions within the extracellular liquid of vertebrates, and molecular machinery for urinary reabsorption of this electrolyte is critical for the maintenance of body osmoregulation. Key ion channels involved in the fine-tuning of sodium homeostasis in tetrapod vertebrates are epithelial sodium channels (ENaCs), which allow the selective influx of sodium ions across the apical membrane of epithelial cells lining the distal nephron or the colon. Furthermore, ENaC-mediated sodium absorption across tetrapod lung epithelia is crucial for the control of liquid volumes lining the pulmonary surfaces. ENaCs are vertebrate-specific members of the degenerin/ENaC family of cation channels; however, there is limited knowledge on the evolution of ENaC within this ion channel family. This review outlines current concepts and hypotheses on ENaC phylogeny and discusses the emergence of regulation-defining sequence motifs in the context of osmoregulatory adaptations during tetrapod terrestrialization. In light of the distinct regulation and expression of ENaC isoforms in tetrapod vertebrates, we discuss the potential significance of ENaC orthologs in osmoregulation of fishes as well as the putative fates of atypical channel isoforms in mammals. We hypothesize that ancestral proton-sensitive ENaC orthologs might have aided the osmoregulatory adaptation to freshwater environments whereas channel regulation by proteases evolved as a molecular adaptation to lung liquid homeostasis in terrestrial tetrapods.
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Pejoski, Slavche, et Venceslav Kafedziski. « Cross-Layer Framework for Multiuser Real Time H.264/AVC Video Encoding and Transmission over Block Fading MIMO Channels Using Outage Probability ». Advances in Multimedia 2014 (2014) : 1–10. http://dx.doi.org/10.1155/2014/362196.

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We present a framework for cross-layer optimized real time multiuser encoding of video using a single layer H.264/AVC and transmission over MIMO wireless channels. In the proposed cross-layer adaptation, the channel of every user is characterized by the probability density function of its channel mutual information and the performance of the H.264/AVC encoder is modeled by a rate distortion model that takes into account the channel errors. These models are used during the resource allocation of the available slots in a TDMA MIMO communication system with capacity achieving channel codes. This framework allows for adaptation to the statistics of the wireless channel and to the available resources in the system and utilization of the multiuser diversity of the transmitted video sequences. We show the effectiveness of the proposed framework for video transmission over Rayleigh MIMO block fading channels, when channel distribution information is available at the transmitter.
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Rice, Joseph, Richard Shockley, Dale Green, John Proakis et Milica Stojanovic. « Telesonar channel estimation and adaptation ». Journal of the Acoustical Society of America 105, no 2 (février 1999) : 1364. http://dx.doi.org/10.1121/1.426462.

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Ivanov, D. V., V. A. Ivanov, N. V. Ryabova et A. A. Kislitsyn. « Implementation of the Maximum Bandwidth Ratio of Satellite Radio Communication Systems under the Conditions for Intramodal Dispersion of Transionospheric Radio Channels ». Радиотехника и электроника 68, no 6 (1 juin 2023) : 571–78. http://dx.doi.org/10.31857/s0033849423060049.

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The problem of significant extension of the band of the transionospheric radio channel to the maximum possible values is solved to improve the efficiency of satellite communication systems. Hardware and software are created to suppress the group delay dispersion using methods of data mining for experimental diagnostics of a transionospheric communication line. Algorithms and tools for intelligent sensory diagnostics of wideband radio channels with adaptation to dispersion variability are developed. In the absence of adaptation, it is possible to create radio channels of undistorted transmission with a bandwidth ratio of no greater than 4.5%, while adaptation to dispersion variability makes it possible to increase the bandwidth ratio to 11.5%. The greatest bandwidth ratio (20–25%) for dispersion-free transmission can be achieved with the aid of adaptive inverse filtering of the channel frequency response in combination with such intelligent methods as equalization with error, machine learning of channel equalizer, and big data processing.
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Li, Shuang, Chi Liu, Qiuxia Lin, Binhui Xie, Zhengming Ding, Gao Huang et Jian Tang. « Domain Conditioned Adaptation Network ». Proceedings of the AAAI Conference on Artificial Intelligence 34, no 07 (3 avril 2020) : 11386–93. http://dx.doi.org/10.1609/aaai.v34i07.6801.

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Tremendous research efforts have been made to thrive deep domain adaptation (DA) by seeking domain-invariant features. Most existing deep DA models only focus on aligning feature representations of task-specific layers across domains while integrating a totally shared convolutional architecture for source and target. However, we argue that such strongly-shared convolutional layers might be harmful for domain-specific feature learning when source and target data distribution differs to a large extent. In this paper, we relax a shared-convnets assumption made by previous DA methods and propose a Domain Conditioned Adaptation Network (DCAN), which aims to excite distinct convolutional channels with a domain conditioned channel attention mechanism. As a result, the critical low-level domain-dependent knowledge could be explored appropriately. As far as we know, this is the first work to explore the domain-wise convolutional channel activation for deep DA networks. Moreover, to effectively align high-level feature distributions across two domains, we further deploy domain conditioned feature correction blocks after task-specific layers, which will explicitly correct the domain discrepancy. Extensive experiments on three cross-domain benchmarks demonstrate the proposed approach outperforms existing methods by a large margin, especially on very tough cross-domain learning tasks.
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Belyy, Vladislav, Kishore Kamaraju, Bradley Akitake, Andriy Anishkin et Sergei Sukharev. « Adaptive behavior of bacterial mechanosensitive channels is coupled to membrane mechanics ». Journal of General Physiology 135, no 6 (31 mai 2010) : 641–52. http://dx.doi.org/10.1085/jgp.200910371.

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Mechanosensitive channel of small conductance (MscS), a tension-driven osmolyte release valve residing in the inner membrane of Escherichia coli, exhibits a complex adaptive behavior, whereas its functional counterpart, mechanosensitive channel of large conductance (MscL), was generally considered nonadaptive. In this study, we show that both channels exhibit similar adaptation in excised patches, a process that is completely separable from inactivation prominent only in MscS. When a membrane patch is held under constant pressure, adaptation of both channels is manifested as a reversible current decline. Their dose–response curves recorded with 1–10-s ramps of pressure are shifted toward higher tension relative to the curves measured with series of pulses, indicating decreased tension sensitivity. Prolonged exposure of excised patches to subthreshold tensions further shifts activation curves for both MscS and MscL toward higher tension with similar magnitude and time course. Whole spheroplast MscS recordings performed with simultaneous imaging reveal activation curves with a midpoint tension of 7.8 mN/m and the slope corresponding to ∼15-nm2 in-plane expansion. Inactivation was retained in whole spheroplast mode, but no adaptation was observed. Similarly, whole spheroplast recordings of MscL (V23T mutant) indicated no adaptation, which was present in excised patches. MscS activities tried in spheroplast-attached mode showed no adaptation when the spheroplasts were intact, but permeabilized spheroplasts showed delayed adaptation, suggesting that the presence of membrane breaks or edges causes adaptation. We interpret this in the framework of the mechanics of the bilayer couple linking adaptation of channels in excised patches to the relaxation of the inner leaflet that is not in contact with the glass pipette. Relaxation of one leaflet results in asymmetric redistribution of tension in the bilayer that is less favorable for channel opening.
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Thèses sur le sujet "Channel adaptation"

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Choi, Jihwan Patrick 1975. « Channel prediction and adaptation over satellite channels with weather-induced impairments ». Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9070.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
Includes bibliographical references (leaves 85-87).
Title as it appears in MIT commencement exercises program, June 2000: Satellite channels with weather-induced impairments.
Bad weather conditions, especially due to rain, cause satellites operating at high frequencies (above 10 GHz) to have significant link attenuation. Usually extra link margins are used to assure link availability. These margins cause inefficient use of precious satellite and terminal power, and unnecessarily limit data throughputs. Efficiency improvements using channel prediction and adaptation over satellite channels with weather-induced impairments are considered in this thesis. First, we consider scintillation and rain attenuation as two dominant factors for signal fading over satellite-earth paths above 10 GHz, and explore physical and mathematical modeling of the two processes. Statistical and spectral analyses of these processes using one or two pole autoregressive (AR) models yield simple linear estimators for the received signal attenuation. Using these estimators, we present results where we can predict the received signal attenuation within ±0.5 dB 1 second ahead and within ± 1.0 dB 4 seconds ahead. For adaptation, we change the signal transmission power, the modulation symbol size, and the code rate adaptively. In particular, we suggest a continuous power control and discrete rate control strategy, through which we build a set of modulation/code states, and discretely change the modulation symbol size and the code rate from state to state. Within each state, continuous power control is implemented. Several examples that use this technique and quantitative analyses of power increase and capacity are provided. The analyses indicate that there is a substantial gain in performance either in capacity and/or power consumption with the adaptive schemes.
by Jihwan Patrick Choi.
S.M.
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Qela, Blerim. « The 8-channel dynamic channel equalizer and its adaptation as a "smart amplifier solution" ». Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27013.

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In this thesis, design of the 8-channel DCE (Dynamic Channel Equalizer) for use in WDM (Wavelength Division Multiplexing) systems in general and in particular its adaptation as a "Smart Amplifier Solution" is presented. The innovative Optimized C-band Gain Flattened EDFA (Erbium Doped Fiber Amplifier) design without GFF (Gain Flattening Filter) and its integration with the DCE and embedded control electronics into a Smart Amplifier is proposed. Further improvement of the Smart Amplifier is suggested. The systems design approach, where all subsystems are taken into account to optimize the WDM network was adopted. Hence, the Post and In-Line Amplifiers with APC (Automatic Power Control) are also considered and designed accordingly to achieve the optimized amplification and equalization results for the dynamic WDM networks. The experimental results and discussion for each design are presented and simulation data are provided for comparison and confirmation of the proposed Smart Amplifier design. In addition, simulation results with respect to feasibility of the Optimized C+L band EDFA and conditions under which it can be used as a broadband ASE source are discussed.
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Ran, Jianjun. « Signal processing, channel estimation and link adaptation in MIMO-OFDM systems ». Göttingen Cuvillier, 2008. http://d-nb.info/989862291/04.

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Du, Jinfeng. « Pulse Shape Adaptation and Channel Estimation in Generalised Frequency Division Multiplexing Systems ». Licentiate thesis, Stockholm : Informations- och kommunikationsteknik, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9457.

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Ogino, Tetsuya. « Environmental adaptation mechanism in marine annelids ». Kyoto University, 2019. http://hdl.handle.net/2433/242707.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(農学)
甲第21830号
農博第2343号
新制||農||1068(附属図書館)
学位論文||H31||N5202(農学部図書室)
京都大学大学院農学研究科応用生物科学専攻
(主査)教授 佐藤 健司, 教授 澤山 茂樹, 准教授 豊原 治彦
学位規則第4条第1項該当
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El, Yakzan Adnan. « Performance prediction, parameter selection, and channel adaptation in the line-of-sight outdoors optical wireless channels using intelligent systems ». Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/59682/.

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With the increased usage of optical wireless communication, finding appropriate parameters for reliable transmission and providing efficient channel performance have become of challenging interest in research and industry. This has been a strong motivation to examine and develop methods and techniques to find suitable link parameters to increase the channel availability. This thesis is mainly concerned with designing, implementing and adapting intelligent algorithms to solve for parameter selection, channel prediction, and channel adaptation in dynamic optical wireless channels. The problem could be solved with other methods such as binary and sequential search; however, intelligent systems have the ability to find optimal results with more reliability, time efficiency and increased flexibility. The research focuses on single and multi-objective selection techniques using application-specific genetic algorithm (ASGA) in the outdoors line-of-sight (LOS) optical wireless channel where parameters have different effects on the channel performance and may affect the behaviour of other channel parameters. The technique is well-established at pre-installation stages of the channel, and could be also applied at run-time if a reconfigurable hardware is installed. An intelligent system, which uses a genetic algorithm predicted and optimized optical wireless channel in the (LOS) field, is presented. The prediction technique is proposed to estimate the bit error rate (BER) at the receiver, and suggests appropriate selection of link parameters. In this research, the work is developed based on on-off keying (OOK) modulation, and makes use of different weather conditions for channel modeling. A first attempt is made with a GA-based selection for transmission wavelengths (700nm to 1600nm), the overall deterministic attenuations being estimated by a visibility model, where the changes in visibility decide about the wavelength control margin. The research is then extended to consider various external link parameters scaled by look-up tables that meet the optical wireless industry. It shows that the transmission power should not always be the only costin the channel, and there are other parameters worthy of control. Principal Component Analysis is applied targeting the ASGA selected datasets to extract the contribution of each parameter to the output, and the implicit relations that exist among data sets to achieve a certain bit-error-rate. An Artificial Neural Network (ANN) is then applied to the channel for BER prediction; this may also validate the pre-installation advice done by PCA. Finally, a two-stage modelling using a neuro-fuzzy hybrid algorithm used for adapting the channel by monitoring the link range and total attenuations in the channel. Through analysing the simulation results using these intelligent systems algorithms, the thesis aims at providing maximum utilization of channel parameters for achieving optimum channel performance and increased availability under the application of various intelligent systems, which demonstrate their efficiency and effectiveness as compared with other techniques.
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Huusko, J. (Jarkko). « Communication performance prediction and link adaptation based on a statistical radio channel model ». Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211473.

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Abstract This thesis seeks to develop a robust semi-analytical performance prediction method for an advanced iterative receiver that processes spatially multiplexed signals that have propagated through frequency-selective receive correlated multiple-input multiple-output (MIMO) wireless communication channels. In a change of perspective, the proposed performance prediction methods are applied at the transmitter, which seeks to attain a target frame error rate (FER) either by adaptive power control or by adaptive modulation and coding (AMC). The performance prediction scheme utilises the statistical properties of the channel—namely noise variance, number of separable propagation paths and the eigenvalues of the receive correlation matrix—to predict the signal-to-interference-plus-noise ratio (SINR) at the output of a frequency domain soft interference cancellation minimum mean square error equaliser. The SINR distribution is used to derive the distribution of the variance of the log-likelihood ratios (LLRs) at the output of a soft symbol-to-bit demapper. Mutual information transfer charts establish a bijective relationship between the variance of the LLRs and mutual information. A 3rd Generation Partnership Project compliant turbo code is assumed. Since the decoder operates independently from the channel, its extrinsic information transfer (EXIT) charts can be simulated in advance. By utilising the approximate LLR variance distribution of the demapped equaliser output, it is possible to evaluate the probability of an intersection between an equaliser chart associated with a random channel realisation and a fixed decoder chart. This probability provides the FER. Since the proposed performance prediction method does not require any instantaneous channel state information, it can be applied at the transmitter side as a robust link adaptation scheme. In adaptive transmission power control, the modulation order and code rate are fixed. By iteratively adjusting transmission power, the transmitter attempts to find an equaliser output LLR variance distribution that reaches a specified target FER. In AMC, transmission power is fixed. The equaliser output's LLR variance distribution is determined by the modulation order, while the decoder chart's position is determined by the code rate. The transmitter iteratively adjusts the code rate and attempts to find a modulation order and code rate pairing that reaches the target FER. For vertically encoded spatially multiplexed systems, the adaptive transmission power control and AMC schemes are complemented by adaptive repeat redundancy and incremental redundancy hybrid automatic repeat request (HARQ) techniques, respectively
Tiivistelmä Työn tavoitteena on kehittää luotettava semianalyyttinen suorituskyvyn ennustusmenetelmä tehokkaalle iteratiiviselle vastaanottimelle, joka käsittelee taajuusselektiivisen, vastaanotinpäässä tilakorreloituneen moniantennikanavan kautta kulkeneita tilakanavoituja signaaleja. Toisessa vaiheessa esitettyjä ennustusmenetelmiä hyödynnetään mukauttamalla lähetystehoa tai modulaatioastetta ja koodisuhdetta (adaptive modulation and coding [AMC]), samalla säilyttäen tavoitteeksi asetetun kehysvirhesuhteen (frame error rate [FER]). Suorituskyvyn ennustusmenetelmä hyödyntää kanavan tilastollisia ominaisuuksia – kohinan varianssia, eroteltavien etenemispolkujen lukumäärää sekä vastaanottimen korrelaatiomatriisin ominaisarvoja – ennustaakseen signaali–kohina-plus-interferenssisuhteen (signal-to-interference-plus-noise ratio [SINR]) jakauman taajuustasossa toimivan, häiriötä poistavan pienimmän keskineliösumman kanavakorjaimen lähdössä. SINR-jakaumasta johdetaan pehmän symboleista biteiksi -muunnoksen jälkeisten logaritmisten bittitodennäköisyyksien suhdelukujen (log-likelihood ratio [LLR]) jakauma. Keskinäisinformaation siirroskartat perustuvat LLR:ien varianssin sekä keskinäisinformaation väliseen bijektiivisyyteen. Informaatio on kanavakoodattu 3rd Generation Partnership Project -standardin mukaisella turbokoodilla. Turbodekooderin toiminta on kanavasta riippumatonta, joten dekooderin lisäinformaation siirroskartat (extrinsic information transfer [EXIT] charts) voidaan simuloida itsenäisesti. Hyödyntämällä kanavakorjaimen lähdön pehmeiden bittipäätösten LLR:ien varianssin jakaumaa, on mahdollista arvioida millä todennäköisyydellä korjaimen satunnaisen kanavarealisaation siirroskartta leikkaa dekooderin siirroskartan. Tämä todennäköisyys voidaan tulkita kehysvirhesuhteeksi. Koska suorituskyvyn ennustusmenetelmä ei vaadi hetkellistä tietoa kanavan tilasta, sitä voidaan hyödyntää lähetyksen mukautuksessa. Mukautuvassa tehonsäädössä modulaatio ja koodisuhde eivät muutu. Lähetin pyrkii iteratiivisella tehonsäädöllä löytämään korjaimen lähdölle LLR-jakauman, joka tuottaa halutun kehysvirhesuhteen. Mukautuvassa modulaation ja koodisuhteen valinnassa lähetysteho säilyy vakiona. Modulaatioaste vaikuttaa korjaimen lähdön LLR-jakaumaan ja koodisuhde dekooderin siirroskartan muotoon. Iteratiivisesti koodisuhdetta säätämällä lähetin pyrkii löytämään modulaation ja koodisuhteen yhdistelmän, joka saavuttaa tavoitellun kehysvirhesuhteen. Vertikaalisesti tilakanavoiduissa järjestelmissä mukautuvaa tehonsäätöä täydennetään lähetystehoa mukauttavilla uudellenlähetyksillä, kun taas mukautuvaa modulaation ja koodisuhteen valintaa täydennetään puolestaan koodisuhdetta pienentävillä automattisilla uudelleenlähetyspyynnöillä (hybrid automatic repeat request [HARQ])
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Huang, Jinliang. « Adaptation in multiple input multiple output systems with channel state information at transmitter ». Licentiate thesis, Stockholm : Institutionen för elektronik, dator- och programvarusystem, Kungliga tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4443.

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FALCÃO, Marcos Rocha de Moraes. « Channel reservation and spectrum adaptation strategies in a multi-level prioritized cognitive radio network ». Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/21070.

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Wireless technologies have dominated the communication's market by offering reasonable speeds and convenience at low deployment costs. However, due to the significant growth of mobile computing devices and their bandwidth demands, together with the paradigm shift brought by the Internet of things, future wireless networks should become highly dense and heterogeneous, which will hardly cope with the traditional fixed spectrum allocation policy. Some standards such as the Long Term Evolution – Advanced (LTE-A), have already set the precedent for carrier aggregation (CA), aiming at scaling up bitrates, which partially helps solving the problem. However, cognitive radio (CR) has been put forward as the most promising solution to handle this complex ecosystem since it may provide better spectrum utilization and user coordination through non-traditional mechanisms. Among other features, it allows non-licensed users, known as secondary users (SUs) to opportunistically use temporarily idle licensed bands that are used by licensed clients called primary users (PUs). Once PUs and SUs are expected to share the same spectrum bands, a critical issue is to concomitantly avoid primary interference while supporting QoS for the secondary services. This dissertation studies the synergistic integration of cognitive radio networks (CRNs), Dynamic Spectrum Access DSA techniques and resource allocation strategies (e.g., CA) that combined, should improve the overall system’s performance. We have proposed a layered M/M/N/N queue-based model that addresses three user priorities, flexible bandwidth choices, multi-level channel reservation and two channel aggregation strategies. Different network load conditions for each feature were evaluated in terms of four performance metrics: blocking probability, forced termination probability, spectrum utilization and throughput. Such study is particularly useful for understanding the effects of each of these approaches in the secondary network. To the best of our knowledge, our model fulfills almost completely the user bandwidth’s possibilities, improves the existing channel reservation formulation and demonstrates that our proposed dynamic channel aggregation strategy performs similarly to a more complex simultaneous channel aggregation and fragmentation approach, but can be technically more feasible.
Tecnologias sem fio têm dominado o mercado das comunicações, oferecendo velocidades razoáveis e conveniência a um baixo custo de implantação. No entanto, devido ao crescimento significativo do número de plataformas computacionais móveis e de suas demandas por largura de banda, acrescido do advento da Internet das Coisas, as redes sem fio do futuro devem passar a ser muito mais densas e heterogêneas, sendo difíceis de se adequar a política tradicional de alocação espectral fixa. Recentemente, o método de agregação de portadora (AP) fora proposto no padrão Long Term Evolution – Advanced (LTE-A), com o propósito de aumentar as taxas de bit, mitigando assim parte do problema. Todavia, rádio cognitivo (RC) foi apresentada como a solução mais promissora para lidar com este ecossistema complexo, uma vez que pode proporcionar uma melhor utilização do espectro e coordenação de usuários através de mecanismos não-tradicionais. Entre outras características, isso permite que usuários não-licenciados também conhecidos como usuários secundários (USs) utilizem de forma oportunista bandas licenciadas temporariamente ociosas, cujos clientes licenciados são também chamados de usuários primários (UPs). Como os UPs e os USs devem compartilhar as mesmas bandas, uma questão crítica é evitar interferência primária e concomitantemente apoiar a qualidade de serviço prestada aos USs. Esta dissertação estuda a integração sinérgica das redes de rádio cognitivas, técnicas de acesso dinâmico ao espectro e estratégias de alocação de recursos (AP), que combinados, devem melhorar o desempenho do sistema. Neste trabalho, propomos um modelo baseado em filas do tipo M/M/N/N, que inclui três prioridades de usuário, opções de largura de banda, reserva de canal multi-nível e duas estratégias de agregação de canal. Para cada recurso estudado, empregamos diferentes condições de carga de rede e avaliamos os resultados em termos de quatro métricas: probabilidade de bloqueio, a probabilidade de terminação forçada, utilização espectral e vazão. Este estudo é particularmente útil para compreender os efeitos de cada uma destas abordagens em relação à rede secundária. O modelo fornecido cumpre quase completamente as possibilidades do largura de banda de cada nível de usuário, melhora a formulação de reserva de canal existente e demonstra que estratégia de agregação de canais proposta possui performance similar a uma abordagem mais complexa de agregação e fragmentação simultânea, mas que seria tecnicamente mais viável.
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Pollitte, Wesley Alan. « The effect of vertical networks on channel governance adaptation a transaction cost economics approach / ». Diss., Connect to online resource - MSU authorized users, 2008.

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Livres sur le sujet "Channel adaptation"

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European Society for Comparative Physiology and Biochemistry. Conference. Adaptations to climatic changes. Sous la direction de Pévet P. Basel : Karger, 1987.

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Flint, Erdreich Sarah, dir. Adaptation and climate change. Detroit : Greenhaven Press, 2009.

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Palutikof, Jean. Climate adaptation futures. The Atrium, Southern Gate, Chichester, West Sussex, UK : Wiley-Blackwell, A John Wiley & Sons Inc., 2013.

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Jenkins, Adam, et Adam Jenkins. Climate change adaptation : Ecology, mitigation, and management. Hauppauge, N.Y : Nova Science Publishers, 2010.

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Adaptation to climate change. Abingdon, Oxon, England : Routledge, 2010.

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United Nations Development Programme (Viangchan, Laos)., dir. National adaptation programme of action to climate change. [Vientiane] : UNDP, 2009.

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Climate change adaptation : Ecology, mitigation, and management. Hauppauge, N.Y : Nova Science Publishers, 2010.

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Neil, Leary, dir. Climate change and adaptation. London : Earthscan, 2008.

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Luke, Parsons. Climate change risk and adaptation in Bangladesh. Dhaka : Green University Press, 2015.

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1930-, Rosenberg Norman J., et Resources for the Future, dir. Greenhouse warming : Abatement and adaptation. Washington, D.C : Resources for the Future, 1989.

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Chapitres de livres sur le sujet "Channel adaptation"

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Ponting, Keith M. « Channel Adaptation ». Dans Computational Models of Speech Pattern Processing, 112–21. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60087-6_12.

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Classon, Brian, Ajit Nimbalker, Stefania Sesia et Issam Toufik. « Link Adaptation and Channel Coding ». Dans LTE - The UMTS Long Term Evolution, 215–48. Chichester, UK : John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470978504.ch10.

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Morais, Douglas H. « Channel Coding and Link Adaptation ». Dans Key 5G Physical Layer Technologies, 103–27. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51441-9_6.

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Morais, Douglas H. « Channel Coding and Link Adaptation ». Dans Key 5G Physical Layer Technologies, 113–41. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89209-8_6.

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Morais, Douglas H. « Channel Coding and Link Adaptation ». Dans 5G NR, Wi-Fi 6, and Bluetooth LE 5, 55–72. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33812-0_5.

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Morais, Douglas H. « Channel Coding and Link Adaptation ». Dans Key 5G/5G-Advanced Physical Layer Technologies, 113–41. Cham : Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-57426-9_6.

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Jia, Yan, Xiang Zhang, Long Lan et Zhigang Luo. « Self-Reinforcing Feedback Domain Adaptation Channel ». Dans Neural Information Processing, 140–52. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-30105-6_12.

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Vallejo, Mónica, Joaquín Recas et José L. Ayala. « Channel Analysis and Dynamic Adaptation for Energy-Efficient WBSNs ». Dans Ubiquitous Computing and Ambient Intelligence, 42–49. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35377-2_6.

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Yu, Chaohui, Jindong Wang, Yiqiang Chen et Zijing Wu. « Transfer Channel Pruning for Compressing Deep Domain Adaptation Models ». Dans Lecture Notes in Computer Science, 257–73. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26142-9_23.

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Akhtar, Saleem, et Djamal Zeghlache. « Rate and Power Adaptation for Downlink Shared Channel in WCDMA ». Dans Multiaccess, Mobility and Teletraffic for Wireless Communications, volume 6, 61–74. Boston, MA : Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-5918-1_4.

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Actes de conférences sur le sujet "Channel adaptation"

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Yang, Chi, Bo Zhou, Xiaohui Hu, Jianying Chen, Qianhua Cai et Yun Xue. « Dual-Channel Domain Adaptation Model ». Dans WI-IAT '21 : IEEE/WIC/ACM International Conference on Web Intelligence. New York, NY, USA : ACM, 2021. http://dx.doi.org/10.1145/3498851.3498984.

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Nguyen, Minh-Quang, Hang Nguyen, Eric Renault et Phan-Thuan Do. « Joint source-channel coding with adaptation ». Dans 2016 IEEE Sixth International Conference on Communications and Electronics (ICCE). IEEE, 2016. http://dx.doi.org/10.1109/cce.2016.7562616.

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Ganapathy, Sriram, Mohamed Omar et Jason Pelecanos. « Noisy channel adaptation in language identification ». Dans 2012 IEEE Spoken Language Technology Workshop (SLT 2012). IEEE, 2012. http://dx.doi.org/10.1109/slt.2012.6424241.

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Judd, Glenn, Xiaohui Wang et Peter Steenkiste. « Low-overhead channel-aware rate adaptation ». Dans the 13th annual ACM international conference. New York, New York, USA : ACM Press, 2007. http://dx.doi.org/10.1145/1287853.1287903.

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Han, Cong, Kevin Wilson, Scott Wisdom et John R. Hershey. « Unsupervised Multi-Channel Separation And Adaptation ». Dans ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2024. http://dx.doi.org/10.1109/icassp48485.2024.10447422.

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Bobarshad, H., M. R. Shikh Bahaei et A. Kobravi. « BER-based adaptation in composite fading channel ». Dans 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications. IEEE, 2008. http://dx.doi.org/10.1109/pimrc.2008.4699402.

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Tridenski, Sergey, et Ram Zamir. « Channel Input Adaptation via Natural Type Selection ». Dans 2018 IEEE International Symposium on Information Theory (ISIT). IEEE, 2018. http://dx.doi.org/10.1109/isit.2018.8437624.

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Fissore, Lorenzo, Pietro Laface, G. Micca et G. Sperto. « Channel adaptation for a continuous speech recognizer ». Dans 2nd International Conference on Spoken Language Processing (ICSLP 1992). ISCA : ISCA, 1992. http://dx.doi.org/10.21437/icslp.1992-188.

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Mohan, Avinash, et K. V. S. Hari. « Low complexity adaptation for channel shortening equalizers ». Dans 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2011. http://dx.doi.org/10.1109/mwscas.2011.6026296.

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Yao, Mingde, Jie Huang, Xin Jin, Ruikang Xu, Shenglong Zhou, Man Zhou et Zhiwei Xiong. « Generalized Lightness Adaptation with Channel Selective Normalization ». Dans 2023 IEEE/CVF International Conference on Computer Vision (ICCV). IEEE, 2023. http://dx.doi.org/10.1109/iccv51070.2023.00979.

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Rapports d'organisations sur le sujet "Channel adaptation"

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Odobetska, Iryna. ADAPTING REGIONAL TELEVISION CONTENT TO THE FORMAT OF SOCIAL NETWORKS (ON THE EXAMPLE OF THE VITA TV CHANNEL). Ivan Franko National University of Lviv, mars 2024. http://dx.doi.org/10.30970/vjo.2024.54-55.12163.

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The article examines the peculiarities of the regional media and the specifics of creating the content of the TV channel’s social networks. The prerequisites for the need to distribute TV content in modern forms of the virtual environment are provided. Ukraine is actively implementing digital technologies in television, which leads to the improvement of the quality and diversity of local media, as a result of which regional television becomes more flexible, interactive and adaptive to changes in consumer preferences and technological capabilities. The growing popularity of social media is being integrated into regional television strategies for audience engagement, engagement and rapid response to events. Regional TV channels increasingly use social networks to interact with viewers, publish news and ensure rapid dissemination of information. The process of adaptation of television content of the information and television agency «VITA» to social networks has been studied. Key words: social networks, content, television, VITA TV channel, text, users, mass media.
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Hertel, Thomas, et David Lobell. Agricultural Adaptation to Climate Change in Rich and Poor Countries : Current Modeling Practice and Potential for Empirical Contributions. GTAP Working Paper, décembre 2012. http://dx.doi.org/10.21642/gtap.wp72.

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In this paper we discuss the scope of the adaptation challenge facing world agriculture in the coming decades. Due to rising temperatures throughout the tropics, pressures for adaptation will be greatest in some of the poorest parts of the world where the adaptive capacity is least abundant. We discuss both autonomous (market driven) and planned adaptations, distinguishing: (a) those that can be undertaken with existing technology, (b) those that involve development of new technologies, and (c) those that involve institutional/market and policy reforms. The paper then proceeds to identify which of these adaptations are currently modeled in integrated assessment studies and related analyses at global scale. This, in turn, gives rise to recommendations about how these models should be modified in order to more effectively capture climate change adaptation in the farm and food sector. In general, we find that existing integrated assessment models are better suited to analyzing adaptation by relative well-endowed producers in the developed countries. They likely understate climate impacts on agriculture in developing countries, while overstating the potential adaptations. This is troubling, since the need for adaptation will be greatest amongst the lower income producers in the poorest tropical countries. This is also where policies and public investments are likely to have the highest payoff. We conclude with a discussion of opportunities for improving the empirical foundations of integrated assessment modeling with an emphasis on the poorest countries. Keywords: Climate change, adaptation, integrated assessment models, investment, new technologies, developing countries. JEL codes: Q54, Q55, Q56, Q58, Q15, Q16, Q17
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Gregow, Hilppa, Antti Mäkelä, Heikki Tuomenvirta, Sirkku Juhola, Janina Käyhkö, Adriaan Perrels, Eeva Kuntsi-Reunanen et al. Ilmastonmuutokseen sopeutumisen ohjauskeinot, kustannukset ja alueelliset ulottuvuudet. Suomen ilmastopaneeli, 2021. http://dx.doi.org/10.31885/9789527457047.

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The new EU strategy on adaptation to climate change highlights the urgency of adaptation measures while bringing forth adaptation as vitally important as a response to climate change as mitigation. In order to provide information on how adaptation to climate change has been promoted in Finland and what calls for attention next, we have compiled a comprehensive information package focusing on the following themes: adaptation policy, impacts of climate change including economic impacts, regional adaptation strategies, climate and flood risks in regions and sea areas, and the availability of scientific data. This report consists of two parts. Part 1 of the report examines the work carried out on adaptation in Finland and internationally since 2005, emphasising the directions and priorities of recent research results. The possibilities of adaptation governance are examined through examples, such as how adaptations steering is organised in of the United Kingdom. We also examine other examples and describe the Canadian Climate Change Adaptation Platform (CCAP) model. We apply current information to describe the economic impacts of climate change and highlight the related needs for further information. With regard to regional climate strategy work, we examine the status of adaptation plans by region and the status of the Sámi in national adaptation work. In part 2 of the report, we have collected information on the temporal and local impacts of climate change and compiled extensive tables on changes in weather, climate and marine factors for each of Finland's current regions, the autonomous Åland Islands and five sea areas, the eastern Gulf of Finland, the western Gulf of Finland, the Archipelago Sea, the Bothnian Sea and the Bay of Bothnia. As regards changes in weather and climate factors, the changes already observed in 1991-2020 are examined compared to 1981-2010 and future changes until 2050 are described. For weather and climate factors, we examine average temperature, precipitation, thermal season duration, highest and lowest temperatures per day, the number of frost days, the depth and prevalence of snow, the intensity of heavy rainfall, relative humidity, wind speed, and the amount of frost per season (winter, spring, summer, autumn). Flood risks, i.e. water system floods, run-off water floods and sea water floods, are discussed from the perspective of catchment areas by region. The impacts of floods on the sea in terms of pollution are also assessed by sea area, especially for coastal areas. With regard to marine change factors, we examine surface temperature, salinity, medium water level, sea flood risk, waves, and sea ice. We also describe combined risks towards sea areas. With this report, we demonstrate what is known about climate change adaptation, what is not, and what calls for particular attention. The results can be utilised to strengthen Finland's climate policy so that the implementation of climate change adaptation is strengthened alongside climate change mitigation efforts. In practice, the report serves the reform of the National Climate Change Adaptation Plan and the development of steering measures for adaptation to climate change both nationally and regionally. Due to its scale, the report also serves e.g. the United Nations’ aim of protecting marine life in the Baltic Sea and the national implementation of the EU strategy for adaptation to climate change. As a whole, the implementation of adaptation policy in Finland must be speeded up swiftly in order to achieve the objectives set and ensure sufficient progress in adaptation in different sectors. The development of binding regulation and the systematic evaluation, monitoring and support of voluntary measures play a key role.
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US ARMY CORPS OF ENGINEERS. Climate Change Adaptation Plan. Fort Belvoir, VA : Defense Technical Information Center, juin 2014. http://dx.doi.org/10.21236/ada617444.

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Carrión, Gloria. Trade and Climate Change Adaptation. Geneva, Switzerland : International Centre for Trade and Sustainable Development, 2009. http://dx.doi.org/10.7215/co_in_20091023a.

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Johnson, T. Fisheries Adaptations to Climate Change. Alaska Sea Grant, University of Alaska Fairbanks, mars 2012. http://dx.doi.org/10.4027/facc.2012.

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R., Bartlett, Bharati L., Pant D., Hosterman H. et McCornick P. Climate change impacts and adaptation in Nepal. International Water Management Institute (IWMI), 2010. http://dx.doi.org/10.5337/2010.227.

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Kahn, Matthew. Climate Change Adaptation : Lessons from Urban Economics. Cambridge, MA : National Bureau of Economic Research, novembre 2014. http://dx.doi.org/10.3386/w20716.

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Sveinsson, Oli G. B. Energy in Iceland : Adaptation to Climate Change. Sous la direction de Hiroshan Hettiarachchi. United Nations University Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES), 2016. http://dx.doi.org/10.53325/adwy8262.

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Ludeña, Carlos E., et Maria Netto. Brazil : Mitigation and Adaptation to Climate Change. Inter-American Development Bank, août 2011. http://dx.doi.org/10.18235/0009162.

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In order to understand the implications of GHG emissions reduction targets in the Brazilian economy it is important to understand the sector composition of these emissions in Brazil. According to the 2010 Second National Communications of Brazil to the UNFCCC, in 2005, the majority of Brazil's emissions (87.2%) corresponded to carbon dioxide (CO2) emissions.
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