Relevant bibliographies by topics / Channel compensation

Academic literature on the topic 'Channel compensation'

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Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Channel compensation"

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Yang, Ze-min, Meng-dao Xing, Guang-cai Sun, and Zheng Bao. "Joint Multichannel Motion Compensation Method for MIMO SAR 3D Imaging." International Journal of Antennas and Propagation 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/852520.

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The multiple-input-multiple-output (MIMO) synthetic aperture radar (SAR) system with a linear antenna array can obtain 3D resolution. In practice, it suffers from both the translational motion errors and the rotational motion errors. Conventional single-channel motion compensation methods could be used to compensate the motion errors channel by channel. However, this method might not be accurate enough for all the channels. What is more, the single-channel compensation may break the coherence among channels, which would cause defocusing and false targets. In this paper, both the translational motion errors and the rotational motion errors are discussed, and a joint multichannel motion compensation method is proposed for MIMO SAR 3D imaging. It is demonstrated through simulations that the proposed method exceeds the conventional methods in accuracy. And the final MIMO SAR 3D imaging simulation confirms the validity of the proposed algorithm.
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Yan, Jianmin. "Research on Coordination Strategy of Dual Channel Supply Chain for Information and Service Sharing." Frontiers in Business, Economics and Management 6, no. 3 (December 2, 2022): 13–16. http://dx.doi.org/10.54097/fbem.v6i3.3110.

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E-commerce channels are favored by consumers with their low price strategy and cost advantages, while physical retail channels play games in the competition with efficient services. Each has its own advantages, which makes consumers flow between different channels, leading to conflicts between channels. This paper analyzes the dual-channel supply chain cooperation mode of information sharing and service sharing, explores the coordination model based on price compensation strategy, and discusses how the manufacturer's e-commerce channel and retailer's physical channel cooperate through the coordination incentive model based on price compensation strategy to achieve the total profit realized under centralized decision-making, and through service sharing to indirectly redistribute profits, achieving win-win cooperation between both parties.
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ADJEMOV, SERGEY S., EVGENIY M. LOBOV, NIKOLAY A. KANDAUROV, ELIZAVETA O. LOBOVA, and VLADISLAV I. LIPATKIN. "ALGORITHMS OF ESTIMATING AND COMPENSATING THE DISPERSION DISTORTIONS OF WIDEBAND SIGNALS IN THE HF CHANNEL." H&ES Research 13, no. 5 (2021): 57–74. http://dx.doi.org/10.36724/2409-5419-2021-13-5-57-74.

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Introduction: radio communication in the decameter range is actively used for communication in remote and hard-to-reach regions of the world. Decameter communication is also a relevant type of radio communication for regions that have suffered serious damage due to natural disasters. The relevance of using decameter radio communication in the above cases is due to the fact that this technology can offer reliable and cheap solutions. The second area of application of decameter radio communications is communications in the Arctic and Antarctic. Practical significance: when receiving signals with a spread spectrum, it becomes necessary to take into account the effect of the frequency dispersion of the ionospheric channel, since it leads to significant distortions of the useful signal and a decrease in the quality of communication in general. An urgent task is to estimate the parameters of the frequency dispersion of the ionospheric channel and to develop algorithms and devices for compensating dispersion distortions of broadband signals. Discussion: this article presents algorithms for estimating and compensating the dispersion distortions of wideband signals in the HF channel. The subbanding estimation method and maximum likelihood estimation (MLE) of the slope of the dispersion characteristic (the slope of DC) are studied. In addition, this article examines the joint MLE of the slope of DC and other parameters of the wideband signal and offers three methods of dispersion distortion compensation. The first method of compensation is a matched filter compensation. The second one is compensation based on the filter bank. Finally, the third method uses a tracking compensator to solve the problem. The experimental results demonstrated in the article were carried out on a one jump track with a length of about 2900 km.
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Wang, Huan, Qinghua Zeng, Zongyu Zhang, and Hongfu Wang. "Research on Temperature Compensation of Multi-Channel Pressure Scanner Based on an Improved Cuckoo Search Optimizing a BP Neural Network." Micromachines 13, no. 8 (August 19, 2022): 1351. http://dx.doi.org/10.3390/mi13081351.

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A multi-channel pressure scanner is an essential tool for measuring and acquiring various pressure parameters in aerospace applications. It is important to note, however, that the pressure sensor of each of these channels will drift significantly with the increase in the temperature range of the pressure measurement, and the output voltage of each of these channels will show nonlinear characteristics, which will constrain the improvements in the accuracy of the measurement. In the regression fitting process, it is difficult to fit nonlinear data with the traditional least-squares method, which leaves pressure measurement accuracy unsatisfactory. A temperature compensation method based on an improved cuckoo search optimizing a BP neural network for a multi-channel pressure scanner is proposed in this paper to improve pressure measurement accuracy in a wide temperature range. Using the chaotic simplex algorithm, we first improved the cuckoo search algorithm, then optimized the connection weights and thresholds of the BP neural network, and finally constructed an experimental calibration system to investigate the temperature compensation of the multi-channel pressure scanning valves in the −40 °C to 60 °C temperature range. The compensation test results show that the algorithm has a better compensation effect and is more suitable for the temperature compensation of multi-channel pressure scanners than the traditional least-squares method and the standard RBF and BP neural networks. The maximum full-scale error of all 32 channels is 0.02% FS (full-scale error) and below, which realizes its high-accuracy multi-point pressure measurement in a wide temperature range.
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Buscarino, A., L. Fortuna, M. Frasca, G. Sciuto, and Mofeed Rashid. "Compensation of transmission channel effects in chaos synchronization." Iraqi Journal for Electrical and Electronic Engineering 7, no. 1 (June 1, 2011): 83–87. http://dx.doi.org/10.37917/ijeee.7.1.16.

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The synchronization of chaos is a well-known topic which attracted the attention of the scientific community in the last two decades. However, the robustness of the synchronous state has been not widely studied, especially considering real cases in which the effects introduced by the physical channel through which chaotic circuits interact, may deeply influence the quality of synchronization and even the onset of it. In this paper, the synchronization of two chaotic circuit coupled through a non–ideal channel is investigated. In particular, the effects of channels introducing a frequency–independent or frequency–dependent time–delay are investigated. Furthermore, two different design strategies to obtain a linear compensation block able to compensate the considered channel effects are presented and the recovery of the synchronous state is discussed.
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Suryani, Titiek, and Gamantyo Hendrantoro. "Block-Type Pilot Arrangement with Alternating Polarity for ICI Mitigation in Mobile OFDM Systems." Journal of Communications Software and Systems 9, no. 3 (September 23, 2013): 178. http://dx.doi.org/10.24138/jcomss.v9i3.147.

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Improvement on Inter Carrier Interference (ICI)mitigation techniques for OFDM caused by Doppler effectsthrough minimizing channel estimation error and decreasingchannel time varying rate is investigated. The performanceof pilot-aided channel estimation techniques depends on pilot placement and arrangement and also on the channel time varying rate. The block-type and comb-type pilot arrangements are studied through different numbers of guard bands, with or without the involvement of the Doppler shift compensation. The estimation of channel at mid-point of each OFDM symbol is derived from pilot frequencies based on the least square algorithm while the channel interpolation is done using piecewise linear approximation. For ICI mitigation technique we implement frequency domain zero forcing equalizer. We compare the performance of schemes with different pilot arrangementsand Doppler shift compensations by measuring bit error rate with QPSK as sub-channel modulation scheme and with mobileto-fixed of single ring scattering as channel model. The results are in favour of block-type pilot arrangements with alternating polarity and Doppler compensation of 0:55 times the maximum Doppler shift.
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Yastrebov, A. V. "Iterative inversion algorithm for an interference correlation matrix." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 2 (June 30, 2017): 4–9. http://dx.doi.org/10.38013/2542-0542-2017-2-4-9.

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The article considers efficiency of a multi-channel interference canceller as a function of the number of compensation channels used for a fixed number of jammers. The author suggests an iterative inversion algorithm for an interference correlation matrix, making it possible to achieve zero loss at a certain stage and decrease the computational complexity of determining weight factors for compensation channels
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Malik, Deepak, Geeta Kaushik, and Amit Wason. "Effects of Diverse Dispersion Compensation Formats at Different Data Rates in Light-Wave System." Journal of Optical Communications 40, no. 3 (July 26, 2019): 273–80. http://dx.doi.org/10.1515/joc-2017-0065.

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Abstract In this article, diverse dispersion compensating techniques are demonstrated and also examined their performance in the presence of nonlinearites at different data rates in between 2.5 and 20 Gbps. Dispersion compensation formats such as pre-compensation, post-compensation, hybrid (symmetrical) compensation, Fiber Bragg grating (FBG) and optical phase conjugation (OPC) are used in single-channel light-wave system. The performance is evaluated on the behalf of different parameters such as Q value, Bit error rate (BER) and eye patterns. It is observed that in dispersion compensation, hybrid compensation format gives better results than the other compensation formats. It is also observed that hybrid compensation format is suitable for high data rates up to 20 Gbps while pre- and post-compensation gives better results up to 15 Gbps and FBG and OPC formats covered better results up to 10 Gbps.
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Bogolyubov, V., and L. Bakhtieva. "Compensation Gyrocompass Based on MEMS." Journal of Physics: Conference Series 2096, no. 1 (November 1, 2021): 012203. http://dx.doi.org/10.1088/1742-6596/2096/1/012203.

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Abstract The study of an astatic compensating gyrocompass, built on the basis of a modulation micromechanical gyroscope (MMG) of a hybrid type, has been carried out. A kinematic diagram is given and the principle of operation of the device has describing. The device uses the modulation principle based on obtaining information about the angular motion of the rotor and creating control torques in a rotating coordinate system, which makes it possible to exclude such a significant disadvantage of MMG as "zero offset". A feature of the gyrocompass under consideration is the use of two channels for controlling the rotor of the MMG, namely: a channel for the formation of a guiding moment, striving to combine its main axis with the direction of the true meridian and a channel for compensating this guiding moment. A linearized mathematical model has building, on the base of which an effective algorithm for the operation of a compensatory astatic gyrocompass is proposed. The device under consideration can be used to determine the true azimuth of the longitudinal axis of a mobile ground object, it has a higher measurement speed compared to devices built on three-degree "heavy" gyroscopes, and has good resistance to external influences (vibrations, shocks, etc.).
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Ishii, Ryuta. "Conflict management in dual distribution channel systems: the moderating role of learning capabilities." Journal of Asia Business Studies 14, no. 4 (February 12, 2020): 525–40. http://dx.doi.org/10.1108/jabs-02-2019-0052.

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Purpose In dual distribution channel systems, integrated channels (manufacturer-owned) and independent channels (distributor-owned) are likely to adopt destructive behaviours. To suppress such behaviours, manufacturers need to implement conflict management systems. The purpose of this study is to examine the moderating role of conflict-learning capability (CLC) in the relationship between conflict management system and destructive behaviour. This study also investigates whether interactions between conflict management systems and CLC improve the overall channel performance. Design/methodology/approach Using survey data from 157 Japanese industrial manufacturers, this study conducted regression analyses and mediation analyses. Findings The results show that boundary and compensation systems have different effects on destructive behaviours. On the one hand, compensation systems with strong CLC have a larger impact, although those with weak CLC can also suppress destructive behaviours to some degree. On the other hand, boundary systems with strong CLC suppress destructive behaviours, but those with weak CLC do not. In addition, this study reveals that manufacturers with strong CLC can indirectly improve overall channel performance by implementing conflict management systems and suppressing destructive behaviours. Originality/value Previous studies reveal that boundary and compensation systems suppress destructive behaviours. However, these studies neglect the importance of organisational capability in the successful implementation of conflict management systems. By focusing on CLC, this study advances our understanding of dual distribution and channel conflict.
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Dissertations / Theses on the topic "Channel compensation"

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Neville, Katrina Lee, and katrina neville@rmit edu au. "Channel Compensation for Speaker Recognition Systems." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080514.093453.

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This thesis attempts to address the problem of how best to remedy different types of channel distortions on speech when that speech is to be used in automatic speaker recognition and verification systems. Automatic speaker recognition is when a person's voice is analysed by a machine and the person's identity is worked out by the comparison of speech features to a known set of speech features. Automatic speaker verification is when a person claims an identity and the machine determines if that claimed identity is correct or whether that person is an impostor. Channel distortion occurs whenever information is sent electronically through any type of channel whether that channel is a basic wired telephone channel or a wireless channel. The types of distortion that can corrupt the information include time-variant or time-invariant filtering of the information or the addition of 'thermal noise' to the information, both of these types of distortion can cause varying degrees of error in information being received and analysed. The experiments presented in this thesis investigate the effects of channel distortion on the average speaker recognition rates and testing the effectiveness of various channel compensation algorithms designed to mitigate the effects of channel distortion. The speaker recognition system was represented by a basic recognition algorithm consisting of: speech analysis, extraction of feature vectors in the form of the Mel-Cepstral Coefficients, and a classification part based on the minimum distance rule. Two types of channel distortion were investigated: • Convolutional (or lowpass filtering) effects • Addition of white Gaussian noise Three different methods of channel compensation were tested: • Cepstral Mean Subtraction (CMS) • RelAtive SpecTrAl (RASTA) Processing • Constant Modulus Algorithm (CMA) The results from the experiments showed that for both CMS and RASTA processing that filtering at low cutoff frequencies, (3 or 4 kHz), produced improvements in the average speaker recognition rates compared to speech with no compensation. The levels of improvement due to RASTA processing were higher than the levels achieved due to the CMS method. Neither the CMS or RASTA methods were able to improve accuracy of the speaker recognition system for cutoff frequencies of 5 kHz, 6 kHz or 7 kHz. In the case of noisy speech all methods analysed were able to compensate for high SNR of 40 dB and 30 dB and only RASTA processing was able to compensate and improve the average recognition rate for speech corrupted with a high level of noise (SNR of 20 dB and 10 dB).
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Freedman, Alan Edward. "Transmission channel compensation in self-synchronizing chaotic systems." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36982.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
Includes bibliographical references (leaf 38).
by Alan Edward Freedman.
M.Eng.
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Haq, Khandker Nadya. "Correction and compensation of I/Q imbalance and multipath channel." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/441.

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This thesis presents adaptive schemes in overcoming signal distortion, caused by l/Q imbalance and multipath propagation, for OFDM and single carrier modulation. A combined correction and compensation scheme has been presented to mitigate the l/Q imbalance and channel for OFDM. The proposed scheme has been compared with three existing schemes. Simulations show that it successfully outperforms the other existing schemes. Similarly, for single carrier modulation two schemes have been presented for l/Q and channel mitigation.
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Jnawali, Shashwat. "RF Impairments Estimation and Compensation in Multi-Antenna OFDM Systems." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1316467659.

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Negusse, Senay. "On Parameter Estimation Employing Sinewave Fit andPhase Noise Compensation in OFDM Systems." Doctoral thesis, KTH, Signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168179.

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In today’s modern society, we are surrounded by a multitude of digital devices.The number of available digital devices is set to grow even more. As the trendcontinues, product life-cycle is a major issue in mass production of these devices.Testing and verification is responsible for a significant percentage of the productioncost of digital devices. Time efficient procedures for testing and characterization aretherefore sought for. Moreover, the need for flexible and low-cost solutions in thedesign architecture of radio frequency devices coupled with the demand for highdata rate has presented a challenge caused by interferences from the analog circuitparts. Study of digital signal processing based techniques which would alleviate theeffects of the analog impairments is therefore a pertinent subject. In the first part of this thesis, we address parameter estimation based on wave-form fitting. We look at the sinewave model for parameter estimation which iseventually used to characterize the performance of a device. The underlying goal isto formulate and analyze a set of new parameter estimators which provide a moreaccurate estimate than well known estimators. Specifically, we study the maximum-likelihood (ML) SNR estimator employing the three-parameter sine fit and derivealternative estimator based on its statistical distribution. We show that the meansquare error (MSE) of the alternative estimators is lower than the MSE of the MLestimator for a small sample size and a few of the new estimators are very close tothe Cramér-Rao lower bound (CRB). Simply put, the number of acquired measure-ment samples translate to measurement time, implying that the fewer the numberof samples required for a given accuracy, the faster the test would be. We alsostudy a sub-sampling approach for frequency estimation problem in a dual channelsinewave model with common frequency. Coprime subsampling technique is usedwhere the signals from both channels are uniformly subsampled with coprime pairof sparse samplers. Such subsampling technique is especially beneficial to lower thesampling frequency required in applications with high bandwidth requirement. TheCRB based on the co-prime subsampled data set is derived and numerical illus-trations are given showing the relation between the cost in performance based onthe mean squared error and the employed coprime factors for a given measurementtime. In the second part of the thesis, we deal with the problem of phase-noise (PHN).First, we look at a scheme in orthogonal frequency-division multiplexing (OFDM)system where pilot subcarriers are employed for joint PHN compensation, channelestimation and symbol detection. We investigate a method where the PHN statis-tics is approximated by a finite number of vectors and design a PHN codebook. Amethod of selecting the element in the codebook that is closest to the current PHNrealization with the corresponding channel estimate is discussed. We present simula-tion results showing improved performance compared to state-of-the art techniques.We also look at a sequential Monte-Carlo based method for combined channel im-pulse response and PHN tracking employing known OFDM symbols. Such techniqueallows time domain compensation of PHN such that simultaneous cancellation ofthe common phase error and reduction of the inter-carrier interference occurs.

QC 20150529

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Ahmed, Sadia. "Channel Analysis and Estimation and Compensation of Doppler Shift in Underwater Acoustic Communication and Mitigation of IFI, ISI in Ultra-wideband Radio." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5408.

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Water occupies three fourth of earth's surface. The remaining one fourth is land. Although human habitats reside on land, there is no denying of the vital connection between land and water. The future sustainability of human species on this planet depends on wise utilization of all available resources, including that provided by the vast water world. Therefore, it is imperative to explore, understand, and define this massive, varying, and in many areas, unexplored water domain. The water domain exploration and data collection can be conducted using manned or unmanned vehicles, as allowed by the water environment. This dissertation addresses three of the key difficulties that occur during underwater acoustic communication among manned and/or unmanned vehicles and proposes feasible solutions to resolve those difficulties. The focus and the contributions of this research involve the following perspectives: 1) Representation of Underwater Acoustic Communication (UAC) Channels: Providing a comprehensive classification and representation of the underwater acoustic communication channel based on the channel environment. 2) Estimation and Compensation of Doppler Shift: Providing compensation algorithm to mitigate varying Doppler shift effect over subcarriers in UAC Orthogonal Frequency Division Multiplexing (OFDM) systems. 3) Mitigation of Inter-symbol Interference (ISI): Providing feasible solution to long delay spread causing ISI in Ultra-wideband channels.
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Hubeika, Valiantsina. "Intersession Variability Compensation in Language and Speaker Identification." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2008. http://www.nusl.cz/ntk/nusl-235432.

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Variabilita kanálu a hovoru je velmi důležitým problémem v úloze rozpoznávání mluvčího. V současné době je ve velkém množství vědeckých článků uvedeno několik technik pro kompenzaci vlivu kanálu. Kompenzace vlivu kanálu může být implementována jak v doméně modelu, tak i v doménách příznaků i skóre. Relativně nová výkoná technika je takzvaná eigenchannel adaptace pro GMM (Gaussian Mixture Models). Mevýhodou této metody je nemožnost její aplikace na jiné klasifikátory, jako napřílad takzvané SVM (Support Vector Machines), GMM s různým počtem Gausových komponent nebo v rozpoznávání řeči s použitím skrytých markovových modelů (HMM). Řešením může být aproximace této metody, eigenchannel adaptace v doméně příznaků. Obě tyto techniky, eigenchannel adaptace v doméně modelu a doméně příznaků v systémech rozpoznávání mluvčího, jsou uvedeny v této práci. Po dosažení dobrých výsledků v rozpoznávání mluvčího, byl přínos těchto technik zkoumán pro akustický systém rozpoznávání jazyka zahrnující 14 jazyků. V této úloze má nežádoucí vliv nejen variabilita kanálu, ale i variabilita mluvčího. Výsledky jsou prezentovány na datech definovaných pro evaluaci rozpoznávání mluvčího z roku 2006 a evaluaci rozpoznávání jazyka v roce 2007, obě organizované Amerických Národním Institutem pro Standard a Technologie (NIST)
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Kurtti, S. (Sami). "Integrated receiver channel and timing discrimination circuits for a pulsed time-of-flight laser rangefinder." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526200460.

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Abstract In this thesis integrated receiver channel techniques and circuit implementations for a pulsed time-of-flight (TOF) laser rangefinder are developed with the aim to achieve centimetre level accuracy within the dynamic range of > 1:10 000 of the input pulse amplitudes. The receiver channel converts the input current pulses produced by the photo detector to voltage pulses and produces a logic-level timing pulse for the time interval measurement. In addition to the minimization of noise, the main design challenge is the minimization of the timing walk error resulting from the varying amplitude of the received optical echo. In automotive perception laser radar application, which was the target application of this work, the input amplitude of the received echo varies in a range of 1:10 000 or even more due to changes in the measured distance and reflectivity and orientation of the target. Two receiver channel and timing discriminator architectures were developed and realized as integrated circuits in 0.35 μm BiCMOS technology, and finally verified by measurements. One of the receiver channels is based on the detection of the zero-crossing of the timing pulse produced with a unipolar-to-bipolar conversion at the input of the receiver. It achieved a timing walk error of ±8 mm in a dynamic range of 1:3000. Another receiver channel is based on the leading edge timing discrimination, in which the timing walk error is being compensated for in time domain by measuring the width of the timing pulse simultaneously with its leading edge time position. An important feature of this technique, suggested in this thesis, is that it is operative also beyond the linear range of the receiver channel, which is typically limited to < 1:100. The receiver channel with leading edge detection and pulse width compensation achieved a compensated walk error of ± 2–3 mm in a dynamic range of ~ 1:100 000. The bandwidth and input referred current noise of the channel were 230 MHz and <100 nArms, respectively. The single-shot timing precision was 120 ps (20 mm in distance) at the SNR of 10. The feasibility of the receiver electronics was verified by two laser radar prototypes. An accuracy of < ± 5 mm was measured in a measurement range from 1 to 55 m, which corresponds to the receiver dynamic range of > 1:10 000 taking into consideration the varying reflectivity of the target materials used
Tiivistelmä Väitöskirjatyössä on suunniteltu integroituja vastaanotintekniikoita ja –piirejä valopulssin kulkuaikamittaustekniikkaan perustuvaan laseretäisyysmittaukseen. Tavoitteena on ollut saavuttaa senttimetriluokan tarkkuus laajalla tulopulssin amplitudin dynaamisella alueella > 1:10 000. Vastaanotinkanava muuntaa valoilmaisimelta saadun tulovirtapulssin jännitepulssiksi ja muodostaa siitä logiikkatasoisen ajoituspulssin aikavälimittauspiirille. Kohinan minimoimisen lisäksi toinen suuri suunnitteluhaaste on minimoida ajoitusvirhe, jota syntyy vastaanotetun optisen tulosignaalin amplitudin vaihdellessa laajalla alueella. Työssä kehitettyjen vastaanotinkanavien yksi sovelluskohdetavoitteista on ollut autoteollisuudessa käytettävät etäisyysmittarit. Näissä tulosignaalin taso vaihtelee erittäin laajalla dynaamisella alueella, joka voi olla > 1:10 000, johtuen laajasta etäisyysmittausalueesta sekä kohteen heijastavuuden ja orientaation vaihteluista. Väitöskirjatyössä kehitettiin ja valmistettiin kaksi vastaanotin- ja ajoitusilmaisurakennetta. Piirit valmistettiin 0,35 μm BiCMOS- teknologialla, ja niiden toiminta varmistettiin mittauksilla. Ensimmäinen vastaanotinkanava-arkkitehtuuri perustuu kanavan tulossa tapahtuvaan unipolaari-bipolaari muutokseen ja sen jälkeiseen nollaylityskohdan ilmaisuun. Piirillä saavutettiin ±8 mm ajoitusvirhe 1:3000 dynaamisella alueella. Toinen vastaanotinkanava-arkkitehtuuri perustuu etureunanilmaisuun, jossa ajoitusvirhe korjataan aikatasossa mittaamalla samanaikaisesti ajoituspulssin paikka ja leveys. Ajoitusvirheenkorjausmenetelmän tärkeä ominaisuus on, että se toimii laajemmalla kuin vastaanottimen lineaarisella alueella (< 1:100). Etureunanilmaisuun ja pulssinleveyden korjaukseen perustuvalla vastaanotinkanavalla saavutettiin korjattu ajoitusvirhe ± 2–3 mm 1:100 000 dynaamisella alueella. Kanavan kaistanleveys oli 230 MHz ja tulon redusoitu virtakohina < 100 nArms. Signaalikohinasuhteella 10 laseretäisyysmittauksen kertamittaustarkkuudeksi mitattiin 120 ps (20 mm etäisyydessä). Väitöskirjatyön yhteydessä valmistettiin lisäksi kaksi prototyyppilasertutkaa, joilla varmistettiin vastaanotinelektroniikan toiminta laajalla > 1:10 000 dynaamisella tulopulssin amplitudin vaihtelualueella. Lasertutkan ajoitusvirheeksi mitattiin < ± 5 mm 1–55 m:n mittausalueella
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David, Radu Alin. "Improving Channel Estimation and Tracking Performance in Distributed MIMO Communication Systems." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-dissertations/229.

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This dissertation develops and analyzes several techniques for improving channel estimation and tracking performance in distributed multi-input multi-output (D-MIMO) wireless communication systems. D-MIMO communication systems have been studied for the last decade and are known to offer the benefits of antenna arrays, e.g., improved range and data rates, to systems of single-antenna devices. D-MIMO communication systems are considered a promising technology for future wireless standards including advanced cellular communication systems. This dissertation considers problems related to channel estimation and tracking in D-MIMO communication systems and is focused on three related topics: (i) characterizing oscillator stability for nodes in D-MIMO systems, (ii) the development of an optimal unified tracking framework and a performance comparison to previously considered sub-optimal tracking approaches, and (iii) incorporating independent kinematics into dynamic channel models and using accelerometers to improve channel tracking performance. A key challenge of D-MIMO systems is estimating and tracking the time-varying channels present between each pair of nodes in the system. Even if the propagation channel between a pair of nodes is time-invariant, the independent local oscillators in each node cause the carrier phases and frequencies and the effective channels between the nodes to have random time-varying phase offsets. The first part of this dissertation considers the problem of characterizing the stability parameters of the oscillators used as references for the transmitted waveforms. Having good estimates of these parameters is critical to facilitate optimal tracking of the phase and frequency offsets. We develop a new method for estimating these oscillator stability parameters based on Allan deviation measurements and compare this method to several previously developed parameter estimation techniques based on innovation covariance whitening. The Allan deviation method is validated with both simulations and experimental data from low-precision and high-precision oscillators. The second part of this dissertation considers a D-MIMO scenario with $N_t$ transmitters and $N_r$ receivers. While there are $N_t imes N_r$ node-to-node pairwise channels in such a system, there are only $N_t + N_r$ independent oscillators. We develop a new unified tracking model where one Kalman filter jointly tracks all of the pairwise channels and compare the performance of unified tracking to previously developed suboptimal local tracking approaches where the channels are not jointly tracked. Numerical results show that unified tracking tends to provide similar beamforming performance to local tracking but can provide significantly better nullforming performance in some scenarios. The third part of this dissertation considers a scenario where the transmit nodes in a D-MIMO system have independent kinematics. In general, this makes the channel tracking problem more difficult since the independent kinematics make the D-MIMO channels less predictable. We develop dynamics models which incorporate the effects of acceleration on oscillator frequency and displacement on propagation time. The tracking performance of a system with conventional feedback is compared to a system with conventional feedback and local accelerometer measurements. Numerical results show that the tracking performance is significantly improved with local accelerometer measurements.
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Zafeiropoluos, Andreas. "An MMC-based topology with Dual-Active-Bridge power channels for load balancing in 50 Hz-railway applications." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201656.

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The purpose of this thesis report is to investigate challenges related to railway electrification. Inac-railway systems, trains are most often single-phase loads, which can create significantunbalances in the grid, when fed directly from two adjacent phases. To enhance power quality atthe railway feeding point, one alternative is to design the system such as the power is fed to thecatenary through Static Frequency Converters (SFCs), which can be a costly solution. Anotheroption is to use Static Compensators (STATCOMs) in shunt connections, handling only theunbalanced amount of power, in order to symmetrize the railway load as seen from the grid side.Modular multilevel converters (MMCs) are the state of the art solutions for medium- and highvoltage/power converter applications, such as load balancing and reactive-power compensation.This project will focus on analyzing Modular Multilevel Converter (MMC) topologies to be usedas load balancers in railway systems. However, the specific requirements of this application reveala potential weakness of MMCs. That is the asymmetrical character of the load may require muchhigher device rating in an MMC compared to a conventional converter, due to the symmetrizingcomponents to rebalance the capacitor voltages in the submodules.This project analyzes a reduced MMC-based topology with only two branches in order to meet therailway load-balancing characteristics. This chain-link compensator uses dc-dc converters tofacilitate power channels in order to restore the power imbalance, without overrating thesemiconductors in the main current path.
Syftet med detta examensarbete är att studera de svårigheter som elektrifierade järnvägar står inför.När systemet utgörs av växelström kan tågen ses som en enfas last, vilket kan skapa avsevärdaobalanser i nätet då det matas från två intilliggande faser. En alternativ systemdesign för att uppnåen god effekt leverans uppnås då effekten är matad till kontaktledningen genom statiska frekvensomräknare (SFCs), detta kan dock vara en kostsam lösning. Ett annat alternativ är att användastatisk shunt kompensation (STATCOMs) som selektivt kan hantera den obalanserade effekten föratt uppnå symmetri och balans i järnvägslasten, sett från nätets sida.Modulära multiomriktare (MMCs) är en ledande teknik för omriktare till applikationer på mellanochhögspännings nivå, till exempel för lastbalans och reaktiv kompensering. Detta projektanalyserar modulära multiomriktare för lastbalansering i järnvägssystem. Kraven för dennaapplikation leder till en potentiell svaghet i MMCs där den asymmetriska karaktären på lastenkräver högre märkeffekt jämfört med konventionella omriktare. Detta på grund av de komponentersom återskapar symmetri och balans i kondensator spänningarna i submodulerna.Här analyseras en reducerad variant av MMC-baserad topologi med enbart två grenar för att mötakraven på järnvägens lastbalans. Denna kedjelänk-kompensator använder dc-dc omriktare för attstyra effektflödet till lasten vid obalanserad effekt, utan att för den skull överdimensionerahalvledarna i den ordinarie strömvägen.
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Books on the topic "Channel compensation"

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Great Britain. Scottish Home and Health Dept., Great Britain Scottish Office, and Great Britain Home Office, eds. Compensating victims of violent crime: Changes to the Criminal Injuries Compensation Scheme. London: HMSO, 1993.

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Board, Securities and Investments. Compensation arrangements: Miscellaneous changes. London: Securities and Investments Board, 1988.

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Office, Home. Compensation for victims of violent crime: Possible changes to the criminal injuries compensation scheme : a consultation paper. [London]: Home Office, 1999.

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Montana. Workers' Compensation Advisory Council. Recommendations for changes in the Montana system, June 1986 & November 1986. [Helena, Mont.]: The Council, 1986.

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W, Eberts Randall, and Groshen Erica L. 1954-, eds. Structural changes in U.S. labor markets: Causes & consequences. Armonk, N.Y: M.E. Sharpe, 1991.

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Troup, Donald. Changes to compensation law: Do the DOE and RICS propodals go far enough?. London: Estates Gazette Ltd, 1989.

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Faure, Michael. Climate change liability. Cheltenham, UK: Edward Elgar, 2011.

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Institute, Pennsylvania Bar. How Medicare has changed the landscape of litigation in personal injury and workers compensation cases. Mechanicsburg, Pa. (5080 Ritter Rd., Mechanicsburg 17055-6903): Pennsylvania Bar Institute, 2012.

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Climate change and future justice: Precaution, compensation, and triage. London: Routledge, 2012.

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Sussman, Zvi. The decentralization of collective bargaining and changes in the compensation structure in Israel's public sector. Jerusalem, Israel: Research Dept., Bank of Israel, 1996.

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Book chapters on the topic "Channel compensation"

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Faruque, Saleh. "Introduction to Channel Coding." In Free Space Laser Communication with Ambient Light Compensation, 1–15. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57484-0_1.

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Lottici, V., and F. Giannetti. "Iterative Nonlinear Channel Compensation in MC-CDMA Systems." In Multi-Carrier Spread-Spectrum, 461–72. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4437-2_50.

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Wang, Wei, Haifeng Hu, and Dihu Chen. "Channel and Constraint Compensation for Generative Adversarial Networks." In Pattern Recognition and Computer Vision, 386–97. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31654-9_33.

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Ito, Noboru. "High-Accuracy Phase-Equalizer for Communication-Channel Compensation." In Intelligent Information and Database Systems, 529–39. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15705-4_51.

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Djordjevic, Ivan B. "Advanced Detection Techniques and Compensation of Channel Impairments." In Advanced Optical and Wireless Communications Systems, 387–494. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63151-6_6.

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Djordjevic, Ivan B. "Advanced Detection Techniques and Compensation of Channel Impairments." In Advanced Optical and Wireless Communications Systems, 303–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98491-5_6.

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Atakan, Baris, and Ozgur B. Akan. "On Channel Capacity and Error Compensation in Molecular Communication." In Transactions on Computational Systems Biology X, 59–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-92273-5_4.

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Shan, Shuangyan, and Zhijing Xu. "Speaker Verification Channel Compensation Based on DAE-RBM-PLDA." In IFIP Advances in Information and Communication Technology, 311–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68121-4_34.

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Li, Qian, Hang Long, and Mingwei Tang. "Iterative Phase Error Compensation Joint Channel Estimation in OFDM Systems." In Communications and Networking, 62–72. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41117-6_6.

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Lee, Jae-Ho, Dong-Joon Choi, Nam-Ho Hur, and Whan-Woo Kim. "Channel Compensation of Variable Symbol Timing Offset in Non-synchronized OFDM System." In Lecture Notes in Electrical Engineering, 73–79. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6516-0_9.

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Conference papers on the topic "Channel compensation"

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Ibsen, Morten, Michael K. Durkin, and Richard I. Laming. "Chirped Moiré Fibre Gratings Operating on two Wavelength-Channels for use as Dual Channel Dispersion Compensators." In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.btua.6.

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Dispersion compensation is necessary in order to allow high data rate transmission through the installed standard fibre links. Several dispersion compensation techniques exists, including dispersion compensating fibre, phase conjugation and chirped fibre gratings. Of these, chirped fibre gratings offer many advantages including compactness, low-loss and low nonlinearity. Recent error-free 10 Gbit/s and 40 Gbit/s transmission experiments at 1.55 μm over 109 km of standard fibre together with the possibility of simultaneous compensation of 2nd and 3rd order dispersion confirm the potential of this solution [1,2,3].
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Gwozdz, Michal. "The power electronics active filter based on a multi-channel inverter." In 2013 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2013. http://dx.doi.org/10.1109/isncc.2013.6604448.

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Omura, Takaki, Shun Kojima, Kazuki Maruta, and Chang-Jun Ahn. "Neural Network based Channel Identification and Compensation." In 2018 18th International Symposium on Communications and Information Technologies (ISCIT). IEEE, 2018. http://dx.doi.org/10.1109/iscit.2018.8587981.

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Gemmeke, Jort F., Tuomas Virtanen, and Kris Demuynck. "Exemplar-based joint channel and noise compensation." In ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2013. http://dx.doi.org/10.1109/icassp.2013.6637772.

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Wittmann, Matthias, Otto Schmidbauer, and Abdulmesih Aktas. "Online channel compensation for robust speech recognition." In 3rd European Conference on Speech Communication and Technology (Eurospeech 1993). ISCA: ISCA, 1993. http://dx.doi.org/10.21437/eurospeech.1993-251.

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Soejima, Shogo, Yuta Ida, Chang-Jun Ahn, Tatsuya Omori, and Kenya Hashimoto. "Non-linear channel compensation method for OFDM under fast fading channel." In TENCON 2011 - 2011 IEEE Region 10 Conference. IEEE, 2011. http://dx.doi.org/10.1109/tencon.2011.6129163.

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Lu, Guanping, Jun Wang, Zhaocheng Wang, Chao Zhang, and Zhixing Yang. "Uplink OFDMA Channel Estimation with Frequency Domain Compensation in Sparse Channel." In 2010 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2010. http://dx.doi.org/10.1109/icece.2010.1101.

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Tisdale, Neil, Tom Kazmierski, and Duncan Brooks. "Channel mismatch compensation for space-time adaptive processors." In MILCOM 2008 - 2008 IEEE Military Communications Conference (MILCOM). IEEE, 2008. http://dx.doi.org/10.1109/milcom.2008.4753528.

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Bondarenko, Valery N., and Timur V. Krasnov. "Adjacent-channel interference compensation efficiency for correlation technique." In 2011 International Siberian Conference on Control and Communications (SIBCON 2011). IEEE, 2011. http://dx.doi.org/10.1109/sibcon.2011.6072630.

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Chen Renyuan, Jiang Kai, Yong Yanmei, and Zhang Changyao. "High resolution dual channel receiving SAR compensation technique." In 2007 1st Asian and Pacific Conference on Synthetic Aperture Radar. IEEE, 2007. http://dx.doi.org/10.1109/apsar.2007.4418712.

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Reports on the topic "Channel compensation"

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Hansen, Donald H. Dual Compensation - Need for Change. Fort Belvoir, VA: Defense Technical Information Center, April 1988. http://dx.doi.org/10.21236/ada194396.

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Kimball, Stephen, Herbert Heneman III, Robin Worth, Jessica Arrigoni, and Daniel Marlin. Teacher Compensation: Standard Practices and Changes in Wisconsin. Wisconsin Center for Education Research, August 2016. http://dx.doi.org/10.12698/cpre.wcer.wp2016-5.

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Matzke, Brett D. Compensating For Changes in MOS Sensors. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/1089110.

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Lustig, Hanno, Chad Syverson, and Stijn Van Nieuwerburgh. Technological Change and the Growing Inequality in Managerial Compensation. Cambridge, MA: National Bureau of Economic Research, January 2009. http://dx.doi.org/10.3386/w14661.

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Gorry, Aspen, Kevin Hassett, R. Glenn Hubbard, and Aparna Mathur. The Response of Deferred Executive Compensation to Changes in Tax Rates. Cambridge, MA: National Bureau of Economic Research, September 2015. http://dx.doi.org/10.3386/w21516.

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Schwartz, Seth, and Phillip Graeter. Recent Changes to U.S. Coal Plant Operations and Current Compensation Practices. Office of Scientific and Technical Information (OSTI), January 2020. http://dx.doi.org/10.2172/1869928.

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McInerney, Melissa, and Kosali Simon. The Effect of State Workers' Compensation Program Changes on the Use of Federal Social Security Disability Insurance. Cambridge, MA: National Bureau of Economic Research, April 2010. http://dx.doi.org/10.3386/w15895.

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Fagúndez, Jaime, Laura Lagos, José Antonio Cortés Vázquez, and Flávia Canastra. Galician Wild Ponies. Socio-Economic Context and Environmental Benefits: Galicia Area Report and Case Study for GrazeLIFE (LIFE18 PRE NL 002). Publishing Service-University of A Coruña, February 2022. http://dx.doi.org/10.17979/spudc.9788497498234.

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The University of A Coruña is partner of the GRAZELIFE LIFE preparatory project (LIFE 18 PRE/NL002). We contributed to the main aim of the project of promoting sustainable grazing by large herbivores, with the study of the particular case of Galician wild ponies as a natural grazing semi-wild land use model, and alternative land uses of short and long-term afforestation, extensive grazing and abandonment. We selected two sub-areas in Galicia representing different situations in dominant land uses and the wild ponies’ system. Xistral, in the north, is a protected Natura 2000 site covered by wet heaths and bogs, ponies are owned by commoners that are mainly cattle farmers. Groba, in the south, is a drier area with dominance of forestry use and high frequency of wildfires, where ponies are owned by non-professional farmers. We performed twenty personal semi-structured interviews with pony owners, land owners and related experts from different sectors (afforestation, tourism, conservation NGOs), and performed two focus groups. We discussed topics such as their relation with ponies, the challenges they face, their demands and feelings on the policies, including CAP subsidies or compensations for wolf attacks, and their expectations for the future. In the field, we selected representative stands of each land use model in each sub-area and performed a systematic record of plant species, measures of plant biomass, and collected soil samples. Measures were used as proxies of biodiversity changes, carbon storage and wildfire risk, to compare between the selected models.
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Fagúndez, Jaime, Laura Lagos, José Antonio Cortés Vázquez, and Flávia Canastra. Galician Wild Ponies. Socio-Economic Context and Environmental Benefits: Galicia Area Report and Case Study for GrazeLIFE (LIFE18 PRE NL 002). Publishing Service-University of A Coruña, February 2022. http://dx.doi.org/10.17979/spudc.9788497498241.

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The University of A Coruña is partner of the GRAZELIFE LIFE preparatory project (LIFE 18 PRE/NL002). We contributed to the main aim of the project of promoting sustainable grazing by large herbivores, with the study of the particular case of Galician wild ponies as a natural grazing semi-wild land use model, and alternative land uses of short and long-term afforestation, extensive grazing and abandonment. We selected two sub-areas in Galicia representing different situations in dominant land uses and the wild ponies’ system. Xistral, in the north, is a protected Natura 2000 site covered by wet heaths and bogs, ponies are owned by commoners that are mainly cattle farmers. Groba, in the south, is a drier area with dominance of forestry use and high frequency of wildfires, where ponies are owned by non-professional farmers. We performed twenty personal semi-structured interviews with pony owners, land owners and related experts from different sectors (afforestation, tourism, conservation NGOs), and performed two focus groups. We discussed topics such as their relation with ponies, the challenges they face, their demands and feelings on the policies, including CAP subsidies or compensations for wolf attacks, and their expectations for the future. In the field, we selected representative stands of each land use model in each sub-area and performed a systematic record of plant species, measures of plant biomass, and collected soil samples. Measures were used as proxies of biodiversity changes, carbon storage and wildfire risk, to compare between the selected models.
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Yao, Yixin, Mingyuan Fan, Arnaud Heckmann, and Corazon Posadas. Transformative Solutions and Green Finance in the People’s Republic of China and Mongolia. Asian Development Bank Institute, November 2022. http://dx.doi.org/10.56506/xfvh2542.

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Asia has experienced widespread transformation and growth, accompanied by increased demographic pressure, greater intensification of agricultural production, industrialization, and urbanization. This economic growth has been very resource- and carbon-intensive, while climate change has triggered or exacerbated behaviors and defense mechanisms that have come at the expense of the natural environment. Therefore, we examine and compare three Asian Development Bank (ADB) projects in two member countries of the Central Asia Regional Economic Cooperation: one in the People’s Republic of China (PRC) and two in Mongolia that relate to sustainable green development and use innovative financial mechanisms, and behavior-changing nudges. We provide comparative analyses and aim to demonstrate effective, innovative, and sustainable green finance and green transformation approaches in these two countries to address these pressures. The ADB–PRC loan for the Anhui Huangshan Xin’an River Ecological Protection and Green Development project aims to help Huangshan municipality reduce water pollution in the Xin’an River Basin, which is part of the Yangtze River Economic Belt. The project is piloting innovative green financing mechanisms to reduce rural pollution and complement the ongoing interprovincial eco-compensation scheme while supporting green agroecological businesses through two interventions: the Green Investment Fund and the Green Incentive Mechanism. In Mongolia, ADB and the Government of Mongolia have developed two large-scale transformative projects using integrated design and innovative green financing mechanisms to leverage private sector investment: (i) Aimags and Soums Green Regional Development Investment Program, which aims to promote green urban–rural linkages, green agribusiness development, natural capital, rangeland regeneration, and soil carbon sequestration through the (ii) Ulaanbaatar Green Affordable Housing and Resilient Urban Renewal Project, which aims to transform Ulaanbaatar’s vulnerable and substandard peri-urban areas into low-carbon, resilient eco-districts that provide access to green affordable housing.
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