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Littérature scientifique sur le sujet « Compression IQ »

Auteur : Grafiati

Publié le 21 décembre 2024

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Articles de revues sur le sujet "Compression IQ"

Lee, Jewon, Eunhee Hyun et Joon-Young Jung. « A Simple and Efficient IQ Data Compression Method Based on Latency, EVM, and Compression Ratio Analysis ». IEEE Access 7 (2019) : 117436–47. http://dx.doi.org/10.1109/access.2019.2936218.

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Chattoraj, Sayantan, Patrick Daugherity, Todd McDermott, Angela Olsofsky, Wyatt J. Roth et Mike Tobyn. « Sticking and Picking in Pharmaceutical Tablet Compression : An IQ Consortium Review ». Journal of Pharmaceutical Sciences 107, n^o 9 (septembre 2018) : 2267–82. http://dx.doi.org/10.1016/j.xphs.2018.04.029.

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Shibata, Naotaka, Takayoshi Tashiro, Shigeru Kuwano, Naohiko Yuki, Youichi Fukada, Jun Terada et Akihiro Otaka. « Performance Evaluation of Mobile Front-Haul Employing Ethernet-Based TDM-PON With IQ Data Compression [Invited] ». Journal of Optical Communications and Networking 7, n^o 11 (3 septembre 2015) : B16. http://dx.doi.org/10.1364/jocn.7.000b16.

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Shibata, Naotaka, Shigeru Kuwano, Jun Terada et Hideaki Kimura. « Dynamic IQ Data Compression Using Wireless Resource Allocation for Mobile Front-Haul With TDM–PON [Invited] ». Journal of Optical Communications and Networking 7, n^o 3 (23 janvier 2015) : A372. http://dx.doi.org/10.1364/jocn.7.00a372.

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Eissa, Mohamed, et Gunter Fischer. « (Digital Presentation) Sub-THz Front Ends for Future Communication and Sensing Technologies in 130nm Sige Bicmos Technology ». ECS Meeting Abstracts MA2022-02, n^o 32 (9 octobre 2022) : 1203. http://dx.doi.org/10.1149/ma2022-02321203mtgabs.

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Introduction: Beyond the-5G technologies are targeting the available bandwidth (BW) in the D-band and J-band. This promises for very high speed communication and sensing accuracy. Although the advantages of operating beyond 100 GHz from the application point of view, it requires a lot of research and development to design a reliable and power efficient chipsets. In this presentation we will go through the design of wideband 240 GHz transmitter (Tx) and receiver (Rx). Firstly an overview about the link budget analysis will be given, then the design of the local carrier signal generator will be discussed. The wideband Txs and Rxs are to be presented with frequency channelizing concept. At the end the results of the wireless links will be demonstrated. Link Budget Analysis: Operating at sub-THz frequencies approaching the transistor fT put a lot of constraints on the system link budget. The elevated noise figure together with the limited maximum Pout of the transistors lead to solutions which might be limited in BW or power efficiency. Hence the design architecture need to be optimized taking into account the elevated power consumption and heat dissipation. Carrier Generation: Several approaches could be followed to generate the sub-THz carrier frequency. For a power efficient solution the fundamental oscillators promise for a power efficient solution but with limited phase noise performance and tuning range. Such a solution is more common for imaging systems operating at a single frequency. In order to achieve wider tuning ranges for multi-channel scenario or FMCW radar systems, the frequency multiplication chains are common, whereas the multiplication factor depends on the system parameters. Sub-THz Rx: Different approaches were followed to realize a wideband sub-THz Rx. For some technologies the transistors ft does not promise the realization of low noise amplifiers (LNA) with reasonable noise figure, gain and BW. Hence the mixer first approach were followed trying to optimize the noise figure of the down conversion mixer as much as possible. This also enhances the input compression point (IP1dB) of the Rx which is better for monostatic radar applications. On the other hand, if the technology in use allows the development of well performing LNA’s, the LNA first approach was followed to enhance the all over NF of the receiver and ease the implementation of IQ Rxs. In our work an LNA was implemented followed by IQ downconversion mixers and baseband chain as presented in [3]. Sub-THz Tx: The Tx main challenging performance parameter in the sub-THz frequency range is to achieve high output compression point across the required BW with as high efficiency as possible. Increasing the power handling capabilities of the power amplifiers (PA) by increasing the transistors sizes of the output stages, leads to low output impedance and hence higher impedance transformation ratios for the matching structures and eventually narrow band designs. Hence the power combining architectures were proposed as an alternative to increase the output power either by combining on-chip or combining in air. In this work a fully integrated IQ Tx is to be presented with on-chip LO chain and 4-way power combined power amplifier. Baseband Signal Generation and Processing The baseband topology depend on the application. For mobile communication or localization use cases a wideband channels are not available directly from the digital processors, a kind of channel bonding is required either in the digital domain or in the analog domain. As a proof of concept we present here 3-IQ frequency interleaving combiner. Wireless Link Demonstrator Two demonstrators are to be presented. The first demonstrator is transmitting a broadband IQ signal generated from an arbitrary wave generator wirelessly utilizing an IQ 240GHz Tx and Rx. Data rates up to 100 Gbps were demonstrated across a 1m of wireless link. The second demonstrator includes the implementation of 3-channel IQ channelizer to create the complex modulated signal at several intermediate frequencies (IFs) and then upconverted to the 240GHz carrier signal. On the Rx side the de-channelizer convert the down modulated signal to three IQ channels. Data rates up to 8Gbps were demonstrated wirelessly with the channelization with potential of further enhancements for more channels integration. Outlook The future of the sub-THz wireless links for high speed communication and localizations goes towards implementing phased array and MIMO systems. This requires the research community to develop novel architectures to develop large scale arrays with acceptable power consumptions and suitable packaging solution. On the baseband side also the channel bonding solutions are still in an early stage, requiring more work to bond modularly larger number of channels.

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Williams, Victoria J., Jenifer Juranek, Karla K. Stuebing, Paul T. Cirino, Maureen Dennis, Robin M. Bowman, Susan Blaser, Larry A. Kramer et Jack M. Fletcher. « Postshunt lateral ventricular volume, white matter integrity, and intellectual outcomes in spina bifida and hydrocephalus ». Journal of Neurosurgery : Pediatrics 15, n^o 4 (avril 2015) : 410–19. http://dx.doi.org/10.3171/2014.10.peds13644.

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OBJECT No previous reports exist that have evaluated the relationships of white matter (WM) integrity with the number of shunt revisions, ventricular volume after shunting, and cognition in medically stable children who have spina bifida and hydrocephalus (SBH). The authors hypothesized that enlarged ventricles and a greater number of shunt revisions decrease WM integrity in children. METHODS In total, 80 children (mean age 13.7 years) who had SBH underwent MRI and IQ testing. Probabilistic diffusion tractography was performed to determine mean diffusion tensor imaging (DTI) metrics along the frontal and parietal tectocortical pathways. The DTI metrics were evaluated for significant correlation with a composite IQ measure and with the total number of shunt revisions and the total lateral ventricular volume obtained through semiautomated parcellation of T1-weighted MRI scans. RESULTS An enlargement in total lateral ventricle volume and an increase in the number of shunt revisions were both associated with higher fractional anisotropy (FA) and with lower radial diffusivity (RD) along both frontal and parietal tectocortical pathways. Children who had not undergone a shunt revision had on average a greater lateral ventricle volume and higher FA and lower RD along frontal and parietal pathways than those who had undergone multiple shunt revisions. The mean DTI metrics along parietal pathways predicted IQ scores, but intellectual ability was not significantly correlated with ventricular volume or with the number of lifetime shunt revisions. CONCLUSIONS Significant changes in DTI metrics were observed as a function of ventricular volume. An increased lateral ventricle volume was associated with elevated FA and decreased RD. Given that the participants were medically stable at the time of the MRI examination, the results suggested that those who have enlarged ventricles show a DTI pattern consistent with axonal compression due to increased intracranial pressure (ICP) in attenuated hydrocephalus. Although limited by a cross-sectional design, the study's findings suggest that DTI metrics may serve as sensitive indicators for chronic, mild hydrocephalus in the absence of overt clinical symptoms due to increased ICP. Having enlarged ventricles and undergoing multiple shunt revisions did not affect intellectual ability in children with SBH.

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Davison, James A. « Achieving Best Visual Outcomes with a Monofocal Intraocular Lens ». US Ophthalmic Review 04, n^o 01 (2011) : 30. http://dx.doi.org/10.17925/usor.2011.04.01.30.

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Specific monofocal intraocular lens (IOL) design features have been integrated over time to provide improved vision performance after lens replacement surgery. Features of the AcrySof® IQ single-piece monofocal IOL (SN60WF, Alcon Laboratories) include architectural, chemical, and surface characteristics that improve performance over earlier designs. The architectural features include single-piece construction with low resistance to compression, 3D haptics for easy implantation, and predictable and stable long-term positioning. The foldable hydrophobic acrylic plastic provides efficient light focus and incorporates ultraviolet (UV) radiation and light-normalized spectrum transmission characteristics. The plastic’s surface incites minimal post-operative uveitis and capsule reaction and also resists epithelial cell proliferation. The biconvex optic is asymmetric with most of the power incorporated into the anterior surface to reduce dysphotopsia. The posterior surface has a base convexity and incorporates an aspheric modification. The optic’s square edge provides a barrier that discourages epithelial cell invasion and consequent posterior capsule opacification and need for neodymium-doped yttrium–aluminum–garnet (Nd:YAG) posterior capsulotomy, and is frosted to reduce dysphotopsia.

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Ku, Tae-Wan. « Numerical and Experimental Investigations on Residual Stress and Hardness within a Cold Forward Extruded Preform ». Materials 16, n^o 6 (19 mars 2023) : 2448. http://dx.doi.org/10.3390/ma16062448.

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Using a preform fabricated by a cold forward extrusion process, the present study numerically predicted and experimentally investigated its residual stress and microstructural characteristics, as well as its plastic deformation damage and hardness. Prior to realizing the preform, AISI 1035 cold-drawn medium carbon steel material with a diameter of 50.0 mm and a height of 121.0 mm is first spheroidized and annealed, after which phosphophyllite is used to coat its outer surface. To identify the influence of the spheroidizing and annealing on the mechanical properties and the microstructural phase, uniaxial compression tests and microscopic observations are carried out. After assuming the deformation behavior of the workpiece during the cold forward extrusion with a plastic material model and with an elasto-plastic material model, separately, three-dimensional finite element simulations are adopted to visualize the residual stress and the plastic deformation damage. The preform produced by cold forward extrusion is fully scanned by using an optical 3D scanner, the Vickers micro-hardness is measured, and the residual stress through EBSD (electron backscatter diffraction) analysis is observed. Briefly, the results show that the ferrite and pearlite within the raw workpiece is well spheroidized by the heat treatment, and that there is a decrease in the KAM (kernel average misorientation) value of about 40%. In terms of the preform obtained by the cold forward extrusion, the dimensional requirement is more suitably met with the predicted layout when adopting the elasto-plastic material model than that of the plastic material one, and the numerically predicted residual stress agrees with the Vickers micro-hardness distribution. It can be verified that the dislocation density (or the internally stored strain energy) based on the IQ map and the IPF map is substantially increased around the extrusion region, and that the KAM value is increased by roughly 516% as the whole average of the observed values.

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Kobasko, Nikolai. « IMPROVEMENT OF IQ - 3 PROCESSES TO ELIMINATE CRACK FORMATION, DECREASE DISTORTION, AND MAXIMIZE MATERIAL STRENGTH, AND DUCTILITY ». EUREKA : Physics and Engineering 4 (29 juillet 2016) : 3–10. http://dx.doi.org/10.21303/2461-4262.2016.000122.

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The paper presents an overview and significant improvement of one of the intensive quenching processes (namely, the IQ-3 process). The IQ-3 process is an interrupted quench method that is usually implemented in high-velocity single-part quenching IQ units. The IQ-3 process is often called a direct convection quenching since, due to a very high water flow rates through the quench chamber, both the film boiling process and the nucleate boiling process are eliminated completely, and convention process starts immediately after beginning of the quench. Different criteria of the IQ-3 process interruption are considered. Normally, the IQ-3 process is interrupted at a time when current surface compressive stresses are at their maximum value. After a conventional IQ-3 process, there is a mixed structure in the part core. The paper focuses on the IQ-3 method that provides a bainitic structure in the part core. A method for calculation of a required water flow rate for high-velocity IQ systems for providing the bainitic part core structure is discussed.

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Kobasko, Nikolai I. « Quench Process and Steel Chemistry Optimization to Prevent Quench Cracking during Hardening of Splined Semi – Axles ». European Journal of Applied Physics 3, n^o 2 (3 avril 2021) : 23–28. http://dx.doi.org/10.24018/ejphysics.2021.3.2.60.

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In the paper the hardening process of splined semi-axles is discussed and physics of preventing the quench crack formation during intensive quenching (IQ) is explained. It is shown that during IQ process at the splined cylindrical surface very high compressive current band residual stresses are formed which prevent the possibility of quench crack formation on splines. It is enough to optimize the stress distribution through the section of semi-axle and perform IQ process in order to prevent quench cracks formation in splines. It is achieved via optimizing depth of surface hardened layer. In this case the depth of surface hardened layer for cylinders and for cylinders with splines are the same. There is no need to create a special thin shell on splines or perform carburization to create such shell. Due to larger martensite specific volume, it results in surface compressive residual stress formation. Absence of martensite phase at the core eliminates core swelling that could be a reason in tensile surface stresses. The idea is supported by FEM calculations and testing of real semi-axles in industrial condition. The new idea simplifies cardinally technological process and makes it less costly.

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Thèses sur le sujet "Compression IQ"

Piana, Thibault. « Étude et développement de techniques de compression pour les signaux de télécommunications en bande de base ». Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2024. http://www.theses.fr/2024IMTA0424.

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Cette thèse examine la compression de signaux pour améliorer l’efficacité de la bande passante dans les communications satellitaires, en se concentrant sur les architectures Cloud Radio Access Networks (C-RAN) pour le segment sol. Réalisée sous contrat CIFRE avec Safran Data Systems et encadrée par le Lab-STICC, cette recherche explore les techniques de compression des signaux RF en bande de base, essentielles pour maintenir une haute fidélité des données transmises entre les stations terrestres et les satellites. L’étude s’appuie sur des avancées comme le Ground Station as a Service (GSaaS), qui permet une gestion optimisée des ressources. Elle aborde spécifiquement les défis liés à la compression efficace des larges bandes passantes utilisées, nécessitant des techniques innovantes pour réduire la charge sur les réseaux terrestres sans compromettre la qualité des signaux. Les méthodes de compression sans perte et avec perte sont évaluées, avec une attention particulière aux techniques de compression basée sur des dictionnaires pour leur efficacité en termes de parcimonie et aux méthodes prédictives pour leur capacité à minimiser les écarts entre prédictions et valeurs réelles. Cette recherche illustre un potentiel significatif pour améliorer la gestion des données dans les communications satellitaires, offrant des solutions viables pour les défis actuels et futurs de la compression de données
This thesis investigates signal compression to enhance bandwidth efficiency in satellite communications, focusing on Cloud Radio Access Network (C-RAN) architectures for the ground segment. Conducted under a CIFRE contract with Safran Data Systems and supervised by Lab-STICC, this research explores the techniques of RF baseband signal compression, crucial for maintaining high fidelity of data transmitted between terrestrial stations and satellites. The study leverages advances such as Ground Station as a Service (GSaaS), which facilitates optimized resource management. It specifically addresses the challenges associated with efficiently compressing the wide bandwidths used, which requires innovative techniques to reduce the load on terrestrial networks without compromising signal quality. Lossless and lossy compression methods are evaluated, with particular emphasis on dictionary-based compression techniques for their efficiency in sparsity, and predictive methods for their ability to minimize discrepancies between predicted and actual values. This research demonstrates significant potential to improve data management in satellite communications, offering viable solutions for current and future data compression challenges

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Serôdio, Francisco Fischer de Almeida. « FPGA-based 5G RU O-RAN Interface ». Master's thesis, 2021. http://hdl.handle.net/10773/32519.

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In order to solve the current problems related to the increase in mobile traffic and the rising costs that a telecommunications infrastructure entails, a new topology in the field of Radio Access Networks called O-RAN or Open- RAN proposed by the O-RAN Alliance, has been set to cause a new RAN paradigm shift. This new RAN architecture divides the various functions present in the RAN into various components whose interfaces are rigorously specified, thus allowing the so-called inter-modular interoperability, which ultimately translates into a drastic reduction in the RAN's CAPEX/OPEX. Of these components, the interoperability between the baseband and radio frequency processing modules - O-DU (Open-Distributed Unit) and O-RU (Open-Radio Unit) - whose connection is called fronthaul, has proved to be the most challenging, due to the various types of information needed to be conveyed. This said, this work focused on the development of an ORAN fronthaul interface based on 10 Gigabit Ethernet over optical fiber for an O-RU based on FPGA (Field Programmable Gate Array). Thus, an architecture following the O-RAN fronthaul specifications was proposed, and covering the Ethernet PHY, MAC, synchronization and packet processing features, a Xilinx IP Core implementation (O-RAN Interface IP) was used. Of the remaining blocks required to complete the interface, the VHDL conceived Compression and Decompression of IQ samples following the BFP (Block Floating Point) algorithm, stand out. Initially planned, the manner with which the interface was to be validated revolved around achieving interoperability with an O-DU. However, due to various constraints, also resulting from the present pandemic situation, it was only possible to verify the interoperability of the Downlink chain. This said, the hardware developed in this context was validated in an isolated way, which also allowed to carry out additional performance evaluating tests on the Compressor and Decompressor in a controlled environment. This way, the interface was then validated, whose interoperability proved to be complex, due to the various external dependencies required, as well as all the rigor imposed by the O-RAN specifications.
Com vista a solucionar os atuais problemas ligados ao aumento do tráfego móvel e aos crescentes custos que uma infraestrutura de telecomunicações acarreta, uma nova topologia no campo das Radio Access Networks denominada de O-RAN ou Open-RAN proposta pela O-RAN Alliance, tem vindo a prometer uma nova revolução do paradigma da RANs. Esta nova arquitetura de RAN divide as diversas funções presentes na RAN em variados componentes cujas interfaces estão rigorosamente especificadas, permitindo assim a designada interoperabilidade inter-modular, que acaba por se traduzir numa redução drástica do CAPEX/OPEX da RAN. Destes componentes, a interoperabilidade entre os módulos de processamento de banda-base e de radiofrequência - O-DU (Open-Distributed Unit) e O-RU (Open-Radio Unit) - cuja ligação é denominada de fronthaul, demonstra-se a mais desafiadora, devido aos vários tipos de informação necessária a transmitir. Neste sentido, este trabalho focou-se no desenvolvimento de uma interface de fronthaul O-RAN assente em 10 Gigabit Ethernet sobre fibra ótica para uma O-RU baseada em FPGA (Field Programmable Gate Array). Desta forma, uma arquitetura seguindo as especificações de fronthaul O-RAN foi proposta, e cobrindo as funcionalidades de Ethernet PHY, MAC, sincronismo e de processamento de pacotes foi utilizada uma implementação da Xilinx (O-RAN Interface IP). Dos restantes blocos necessários a completar a interface destacam-se as funcionalidades de Compressão e Descompressão de amostras IQ, seguindo o algoritmo de BFP (Block Floating Point), cujo desenvolvimento foi feito em VHDL. De forma a validar a interface, em primeiro plano teve-se como objetivo alcançar interoperabilidade com uma O-DU, no entanto, devidos a variados constrangimentos, também resultantes da presente situação pandémica, só foi possível verificar a interoperabilidade da cadeia de Downlink. Dito isto, o hardware desenvolvido neste contexto foi validado de um modo isolado, o que também permitiu efetuar testes adicionais de avaliação de desempenho em ambiente controlado ao Compressor e Descompressor desenvolvidos. Deste modo, foi então validada a interface, cuja interoperabilidade se demonstrou complexa, devido às várias necessárias dependências externas, assim como todo o rigor a que todas as especificações O-RAN obrigam.
Mestrado em Engenharia Eletrónica e Telecomunicações

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Makowe, Alistair. « The effectiveness of the Impulse iQ® Adjusting Instrument compared to ischaemic compression in the treatment of upper trapezius myofascial trigger points in participants with non-specific neck pain ». Thesis, 2016. http://hdl.handle.net/10321/1709.

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Submitted in partial compliance with the requirements for the Master’s Degree in Technology: Chiropractic, Durban University of Technology, Durban, South Africa, 2016.
Aim: This study aimed to compare the effectiveness of the Impulse iQ® Adjusting Instrument and ischaemic compression on trigger points in pain relief and quality of life in adults presenting with non-specific neck pain. Methodology: This study was a randomised single-blinded clinical trial which consisted of 40 participants residing in the eThekwini municipality, divided into two groups of 20 each. The participants were randomly assigned using concealed allocation to one of two treatment groups of 20 viz. Impulse iQ® Adjusting Instrument (IAI) trigger point therapy group and ischaemic compression (IC) group. Neck pain level was determined using a numerical pain rating scale (NRS). Degree of lateral flexion (LF) was determined by a cervical range of motion (CROM) goniometer. Pain pressure thresholds (PPT) were measured with a pain pressure algometer. The effect of neck pain on participants’ activities of daily living was assessed using the Canadian Memorial Chiropractic College (CMCC) Neck Disability Index (NDI). The participants’ overall perception of improvement since the initiation of treatment was assessed using the Patients Global Impression of Change (PGIC). The participants received three treatments over a two and half week period with the fourth consultation being used for the final subjective and objective measurements. Results: Repeated measures ANOVA testing was used to examine the intra-group effect of time and the inter-group effect of treatment on the outcomes of NRS, algometer readings and CROM goniometer measurements. Profile plots were used to assess the direction and trends of the effects. An intra-group analysis revealed that, objectively and subjectively, all groups responded positively to treatment over time, with no significant time-group interaction. It was noted that there was a higher rate of improvement in IAI Group with respect to algometer readings over time; however, this difference was not statistically significant. Conclusion: This study concluded that neither IAI nor IC is more effective than the other with respect to participants’ pain perception and CROM. However, the IAI was more effective on pain pressure threshold. Based on the results collected from this study, both therapies can used in the treatment protocols of neck pain associated with MFTPs.
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Chapitres de livres sur le sujet "Compression IQ"

Kwak, HoJun, SungKwon Park, JoonYoung Jung, Eunhui Hyun et JeWon Lee. « Compression Method to Remove Unnecessary MSBs of IQ Data Frames in C-RAN ». Dans Lecture Notes in Computer Science, 315–22. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61382-6_26.

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Actes de conférences sur le sujet "Compression IQ"

Aronov, Michael, Ed Rylicki et Chris Pedder. « Intensively Quenched Steels for Stronger Parts ». Dans IFHTSE 2024, 122–31. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.ifhtse2024p0122.

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Abstract An intensive quenching (IQ) process is an environmentally friendly method of hardening steel parts. Digitally controlled, IQ employs highly agitated and directed water flow as the quenchant. An extremely high cooling rate applied uniformly over the entire part surface area induces high surface compressive stresses which prevents part distortion and cracking while forming a very fine microstructure. The fine microstructure results in better mechanical properties compared to properties imparted by conventional oil or polymer quenching. The improved mechanical properties enable engineers to design stronger steel parts for higher power density mechanical systems often using steels containing a less amount of alloying elements or using less expensive plain carbon steels. A broad and deep body of knowledge documents IQ’s ability to tailor a steel component’s microstructure to improve steel parts mechanical properties and performance. A sampling of data will be presented including surface and core hardness, tensile, yield and impact strength, elongation and reduction in area, residual surface compressive stresses for through hardened steels and the carburized grades. IQ systems can be readily “dropped in” to existing steel processing facilities or integrated into next generation heating and cooling systems through teamed relationships with equipment makers and part manufacturers seeking a sustainable future.

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Ohira, Kazuya, Takanori Hara et Koji Ishibashi. « Aggregate-Compression-Aided Subcarrier IQ Index Modulation ». Dans 2018 15th Workshop on Positioning, Navigation and Communications (WPNC). IEEE, 2018. http://dx.doi.org/10.1109/wpnc.2018.8555776.

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Zheng, Yufeng, Genshe Chen, Zhonghai Wang et Erik Blasch. « Image quality (IQ) guided multispectral image compression ». Dans SPIE Commercial + Scientific Sensing and Imaging, sous la direction de Liyi Dai, Yufeng Zheng, Henry Chu et Anke D. Meyer-Bäse. SPIE, 2016. http://dx.doi.org/10.1117/12.2225532.

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Shehata, Aya, Matthieu Crussiere et Philippe Mary. « Analysis of Baseband IQ Data Compression Methods for Centralized RAN ». Dans 2020 28th European Signal Processing Conference (EUSIPCO). IEEE, 2021. http://dx.doi.org/10.23919/eusipco47968.2020.9287760.

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Hoffmann, Simon, Felix Willert, Markus Hofbauer, Andreas Schimpe et Frank Diermeyer. « Quantifying the Influence of Image Quality on Operator Reaction Times for Teleoperated Road Vehicles ». Dans 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002322.

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Teleoperated Driving (ToD) is a widely acknowledged concept applied to handle edge-case situations in automated vehicles. In ToD, a human operator judges and resolves these situations based on video streams. Due to varying network coverage, the compression level of these video streams and therefore the resulting image quality (IQ) are adjusted dynamically. In the presented work, the effect of IQ on task performance is investigated. We hypothesize that IQ impacts the operator’s reaction time to dynamic obstacles, and therefore influences safety. We conducted a user study to test this hypothesis. Subjective and objective data were collected. The results reveal that IQ has a significant influence on the operator’s task performance.

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Shehata, Aya, Philippe Mary et Matthieu Crussiere. « Compression of Clipped OFDM IQ Samples for Cloud Radio Access Network ». Dans 2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC). IEEE, 2021. http://dx.doi.org/10.1109/pimrc50174.2021.9569447.

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Shibata, Naotaka, Shigeru Kuwano, Jun Terada et Hideaki Kimura. « Dynamic IQ compression technique in mobile front-haul for mobile optical network ». Dans 2014 12th International Conference on Optical Internet 2014 (COIN). IEEE, 2014. http://dx.doi.org/10.1109/coin.2014.6950560.

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Do, Van Long, Thai Binh Nguyen, Vu Kien Dao et Cuong Hoang Nguyen. « Compression of wideband IQ samples using linear predictive coding and frame of reference ». Dans 2017 IEEE 2nd International Conference on Signal and Image Processing (ICSIP). IEEE, 2017. http://dx.doi.org/10.1109/siprocess.2017.8124567.

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Nanba, Shinobu, et Akira Agata. « A new IQ data compression scheme for front-haul link in Centralized RAN ». Dans 2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC Workshops). IEEE, 2013. http://dx.doi.org/10.1109/pimrcw.2013.6707866.

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Rathore, Ravinder Pratap Singh. « Reconfigurable digital radar receiver implemented in FPGA using Under-sampling, Direct IQ generation, Multi-rate filter and pulse compression ». Dans 2014 IEEE International Microwave and RF Conference (IMaRC). IEEE, 2014. http://dx.doi.org/10.1109/imarc.2014.7039001.

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