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Literatura académica sobre el tema "Real-time software-defined radio systems"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Real-time software-defined radio systems"

Sivokon, V. P. y D. V. Lapshov. "SOFTWARE DEFINED RADIO TECHNOLOGY IN THE TASKS OF RADIONOISE CONTROL". Bulletin оf Kamchatka State Technical University, n.º 58 (2021): 17–28. http://dx.doi.org/10.17217/2079-0333-2021-58-17-28.

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The article is dedicated to study of the atmospheric noise properties in the range of intermediate and decameter waves in the Western Bering Sea zone, where such observations were not carried out earlier. Since it is impossible to use the radio equipment of ships for such measurements, we used devices using the technology of software-defined radio systems. The measurements were carried out along the coast of Kamchatka and made it possible to establish the characteristic temporal, spatial and frequency variations in the parameters of atmospheric noise. It was found that the radio noise intensity distributions proposed due the recommendations of the International Telecommunication Union differ significantly from the real ones. The obtained data analysis showed the possibility of realizing a decameter range of circumpolar latitudes, unfavorable for radio engineering systems – a sharp increase in the intensity of radio noise due to the coincidence in time of several thunderstorm activity foci and a simultaneous decrease in absorption in the ionosphere.

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Duarte, Luis, Rodolfo Gomes, Carlos Ribeiro y Rafael F. S. Caldeirinha. "A Software-Defined Radio for Future Wireless Communication Systems at 60 GHz". Electronics 8, n.º 12 (6 de diciembre de 2019): 1490. http://dx.doi.org/10.3390/electronics8121490.

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This paper reports on a complete end-to-end 5G mmWave testbed fully reconfigurable based on a FPGA architecture. The proposed system is composed of a baseband/low-IF processing unit, and a mmWave RF front-end at both TX/RX ends. In particular, the baseband unit design is based on a typical agile digital IF architecture, enabling on-the-fly modulations up to 256-QAM. The real-time 5G mmWave testbed, herein presented, adopts OFDM as the transmission scheme waveform, which was assessed OTA by considering the key performance indicators, namely EVM and BER. A detailed overview of system architecture is addressed together with the hardware considerations taken into account for the mmWave testbed development. Following this, it is demonstrated that the proposed testbed enables real-time multi-stream transmissions of UHD video content captured by nine individual cameras, which is in fact one of the killing applications for 5G.

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Radu, Florin, Petru A. Cotfas, Marian Alexandru, Titus C. Bălan, Vlad Popescu y Daniel T. Cotfas. "Signals Intelligence System with Software-Defined Radio". Applied Sciences 13, n.º 8 (21 de abril de 2023): 5199. http://dx.doi.org/10.3390/app13085199.

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In this paper, we present the implementation of a system that identifies the modulation of complex radio signals. This is realized using an artificial intelligence model developed, trained, and integrated with Microsoft Azure cloud. We consider that cloud-based platforms offer enough flexibility and processing power to use them instead of conventional computers for signal processing based on artificial intelligence. We tested the implementation using a software-defined radio platform developed in GNU Radio that generates and receives real modulated signals. This process ensures that the solution proposed is viable to be used in real signal processing systems. The results obtained show that for certain modulation types, the identification is performed with a high degree of success. The use of a cloud-based platform allows quick access to the system. The user is able to identify the signal modulation using only a laptop that has access to the internet.

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Bargarai, Faiq A. Mohammed, Adnan Mohsin Abdulazeez, Volkan Müjdat Tiryaki y Diyar Qader Zeebaree. "Management of Wireless Communication Systems Using Artificial Intelligence-Based Software Defined Radio". International Journal of Interactive Mobile Technologies (iJIM) 14, n.º 13 (14 de agosto de 2020): 107. http://dx.doi.org/10.3991/ijim.v14i13.14211.

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The wireless communication system was investigated by novel methods, which produce an optimized data link, especially the software-based methods. Software-Defined Radio (SDR) is a common method for developing and implementing wireless communication protocols. In this paper, SDR and artificial intelligence (AI) are used to design a self-management communication system with variable node locations. Three affected parameters for the wireless signal are considered: channel frequency, bandwidth, and modulation type. On one hand, SDR collects and analyzes the signal components while on the other hand, AI processes the situation in real-time sequence after detecting unwanted data during the monitoring stage. The decision was integrated into the system by AI with respect to the instantaneous data read then passed to the communication nodes to take its correct location. The connectivity ratio and coverage area are optimized nearly double by the proposed method, which means the variable node location, according to the peak time, increases the attached subscriber by a while ratio

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Șorecău, Mirela, Emil Șorecău, Annamaria Sârbu y Paul Bechet. "Real-Time Statistical Measurement of Wideband Signals Based on Software Defined Radio Technology". Electronics 12, n.º 13 (3 de julio de 2023): 2920. http://dx.doi.org/10.3390/electronics12132920.

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The increase in channel bandwidth and peak-to-average power ratio (PAPR) of modern communication standards poses a serious challenge to performing channel power (CP) and complementary cumulative distribution function (CCDF) measurements in real-time using standard measurement solutions based on spectrum analyzers (SA). Recently, Software Defined Radio (SDR) technology has become a viable alternative to the conventional real-time spectrum monitoring approach based on SA due to its reduced cost. Therefore, in this paper, we propose a novel, innovative, agile and cost-effective solution to enable both CP and CCDF measurements on a state-of-the-art SDR platform. The proposed solution exploits the ability of the SDR equipment to access signal samples in the time domain and defines both CP and CCDF-type measurements. The two measurement functions are software implemented in GNU Radio by designing customized blocks and integrated into a graphical user interface. The proposed system was first tested and parameterized in a controlled environment using emitted signals specific to the IEEE 802.11ax family of wireless local area networks. After parameterization, the SDR-based system was used for over-the-air measurements of signals emitted in the 4G+, 5G and 802.11ax communication standards. By performing the measurement campaign, we have demonstrated the capabilities of the measurement system in performing real-time measurements on broadband channels (up to 160 MHz for IEEE 802.11ax). Altogether, we have proved the usability of CP and CCDF measurement functions in providing valuable insights into the power distribution characteristics of signals emitted by the latest communication standards. By exploiting the versatility of SDR technology, we have enabled a cost-effective solution for advanced real-time statistical measurements of modern broadband signals.

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Ghiaasi, Golsa, Thomas Blazek, Mehdi Ashury, Rute Ramalho Santos y Christoph Mecklenbräuker. "Real-Time Emulation of Nonstationary Channels in Safety-Relevant Vehicular Scenarios". Wireless Communications and Mobile Computing 2018 (8 de mayo de 2018): 1–11. http://dx.doi.org/10.1155/2018/2423837.

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This paper proposes and discusses the architecture for a real-time vehicular channel emulator capable of reproducing the input/output behavior of nonstationary time-variant radio propagation channels in safety-relevant vehicular scenarios. The vehicular channel emulator architecture aims at a hardware implementation which requires minimal hardware complexity for emulating channels with the varying delay-Doppler characteristics of safety-relevant vehicular scenarios. The varying delay-Doppler characteristics require real-time updates to the multipath propagation model for each local stationarity region. The vehicular channel emulator is used for benchmarking the packet error performance of commercial off-the-shelf (COTS) vehicular IEEE 802.11p modems and a fully software-defined radio-based IEEE 802.11p modem stack. The packet error ratio (PER) estimated from temporal averaging over a single virtual drive and the packet error probability (PEP) estimated from ensemble averaging over repeated virtual drives are evaluated and compared for the same vehicular scenario. The proposed architecture is realized as a virtual instrument on National Instruments™ LabVIEW. The National Instrument universal software radio peripheral with reconfigurable input-output (USRP-Rio) 2953R is used as the software-defined radio platform for implementation; however, the results and considerations reported are of general purpose and can be applied to other platforms. Finally, we discuss the PER performance of the modem for two categories of vehicular channel models: a vehicular nonstationary channel model derived for urban single lane street crossing scenario of the DRIVEWAY’09 measurement campaign and the stationary ETSI models.

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Abdelkareem, A. E., Saad Mohammed Saleh y Ammar D. Jasim. "Design and Implementation of an Embedded System for Software Defined Radio". International Journal of Electrical and Computer Engineering (IJECE) 7, n.º 6 (1 de diciembre de 2017): 3484. http://dx.doi.org/10.11591/ijece.v7i6.pp3484-3491.

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<p>In this paper, developing high performance software for demanding real-time embedded systems is proposed. This software-based design will enable the software engineers and system architects in emerging technology areas like 5G Wireless and Software Defined Networking (SDN) to build their algorithms. An ADSP-21364 floating point SHARC Digital Signal Processor (DSP) running at 333 MHz is adopted as a platform for an embedded system. To evaluate the proposed embedded system, an implementation of frame, symbol and carrier phase synchronization is presented as an application. Its performance is investigated with an on line Quadrature Phase Shift keying (QPSK) receiver. Obtained results show that the designed software is implemented successfully based on the SHARC DSP which can utilized efficiently for such algorithms. In addition, it is proven that the proposed embedded system is pragmatic and capable of dealing with the memory constraints and critical time issue due to a long length interleaved coded data utilized for channel coding.</p>

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Holtom, Jacob, Andrew Herschfelt, Isabella Lenz, Owen Ma, Hanguang Yu y Daniel W. Bliss. "WISCANet: A Rapid Development Platform for Beyond 5G and 6G Radio System Prototyping". Signals 3, n.º 4 (9 de octubre de 2022): 682–707. http://dx.doi.org/10.3390/signals3040041.

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Validating RF applications is traditionally time consuming, even for relatively simple systems. We developed the WISCA Software-Defined Radio Network (WISCANet) to accelerate the implementation and validation of radio applications over-the-air (OTA). WISCANet is a hardwareagnostic control software that automatically configures and controls a software-defined radio (SDR) network. By abstracting the hardware controls away from the user, WISCANet allows a non-expert user to deploy an OTA application by simply defining a baseband processing chain in a high level language. This technology reduces transition time between system design and OTA deployment, accelerates debugging and validation processes, and makes OTA experimentation more accessible to users that are not radio hardware experts. WISCANet emulates real-time RF operations, enabling users to perform real-time experiments without the typical restrictions on processing speed and hardware capabilities. WISCANet also supports multiple RF front-ends (RFFEs) per compute node, allowing sub-6 and mmWave systems to coexist on the same node. This coexistence enables simultaneous baseband processing that simplifies and enhances advanced algorithms and beyond-5G applications. In this study, we highlight the capabilities of WISCANet in several sub-6 and mmWave over-the-air demonstrations. The open source release of this software may be found on the WISCA GitHub page.

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Stef, Mihai Petru y Zsolt Alfred Polgar. "Software Platform for the Comprehensive Testing of Transmission Protocols Developed in GNU Radio". Information 15, n.º 1 (20 de enero de 2024): 62. http://dx.doi.org/10.3390/info15010062.

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With the constant growth of software-defined radio (SDR) technologies in fields related to wireless communications, the need for efficient ways of testing and evaluating the physical-layer (PHY) protocols developed for these technologies in real-life traffic scenarios has become more critical. This paper proposes a software testbed that enhances the creation of network environments that allow GNU radio applications to be fed with test traffic in a simple way and through an interoperable interface. This makes the use of any traffic generator possible—existing ones or one that is custom-built—to evaluate a GNU radio application. In addition, this paper proposes an efficient way to collect PHY-specific monitoring data to improve the performance of the critical components of the message delivery path by employing the protocol buffers library. This study considers the entire testing and evaluation ecosystem and demonstrates how PHY-specific monitoring information is collected, handled, stored, and processed as time series to allow complex visualization and real-time monitoring.

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Restuccia, Francesco y Tommaso Melodia. "Toward Polymorphic Internet of Things Receivers Through Real-Time Waveform-Level Deep Learning". GetMobile: Mobile Computing and Communications 25, n.º 3 (7 de enero de 2022): 28–33. http://dx.doi.org/10.1145/3511285.3511294.

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Wireless systems such as the Internet of Things (IoT) are changing the way we interact with the cyber and the physical world. As IoT systems become more and more pervasive, it is imperative to design wireless protocols that can effectively and efficiently support IoT devices and operations. On the other hand, today's IoT wireless systems are based on inflexible designs, which makes them inefficient and prone to a variety of wireless attacks. In this paper, we introduce the new notion of a deep learning-based polymorphic IoT receiver, able to reconfigure its waveform demodulation strategy itself in real time, based on the inferred waveform parameters. Our key innovation is the introduction of a novel embedded deep learning architecture that enables the solution of waveform inference problems, which is then integrated into a generalized hardware/software architecture with radio components and signal processing. Our polymorphic wireless receiver is prototyped on a custom-made software-defined radio platform. We show through extensive over-the-air experiments that the system achieves throughput within 87% of a perfect-knowledge Oracle system, thus demonstrating for the first time that polymorphic receivers are feasible.

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Tesis sobre el tema "Real-time software-defined radio systems"

McGinley, James W. "Real-time software-defined-radio implementation of a two source distributed beamformer". Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-010807-213448.

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Yu, Kevin Z. "Scalable Cognitive Radio Network Testbed in Real Time". DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2338.

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Modern society places an increasingly high demand on data transmission. Much of that data transmission takes place through communication over the frequency spectrum. The channels on the spectrum are limited resources. Researchers realize that at certain times of day some channels are overloaded, while others are not being fully utilized. A spectrum management system may be beneficial to remedy this efficiency issue. One of the proposed systems, Cognitive Radio Network (CRN), has progressed over the years thanks to studies on a wide range of subjects, including geolocation, data throughput rate, and channel handoff selection algorithm, which provide fundamental support for the spectrum management system. To move CRN technology forward, in this thesis we propose a physical, scalable testbed for some of the extant CRN methodologies. This testbed integrates IEEE standards, FCC guidelines, and other TV band regulations to emulate CRN in real time. With careful component selections, we include sufficient operational functionalities in the system, while at the same time making sure it remains affordable. We evaluate the technical feasibility of the testbed by studying several simple CRN logics. When comparing a system with a selection table implemented to those with naive selection methods, there is more than a 60 percent improvement in the overall performance.

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Wang, Tsu-Han. "Real-time Software Architectures and Performance Evaluation Methods for 5G Radio Systems". Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS362.pdf.

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La thèse porte sur les architectures temps réel pour la radio-logicielle 5G. Afin de répondre aux exigences de performances de la 5G, une accélération des procédés critiques combinée à des méthodes d’ordonnancement de processus temps réels sont nécessaires. Dans les systèmes embarqués 5G, l'accélération équivaut à une combinaison judicieuse d'unités matérielles supplémentaires pour les fonctions les plus coûteuses en termes de calcul avec des composants logiciels pour des procédures de contrôle complexe ainsi que l’arithmétique simples. Des solutions entièrement logicielles apparaissent également pour certaines applications, notamment dans l'écosystème dit Open Radio-Access Network (openRAN). Les contributions de cette thèse résident dans des méthodes d'accélération purement logicielles et de contrôle en temps réel d'interfaces dit « fronthaul » à faible latence. Étant donné que la 5G a des exigences de latence strictes et prend en charge le trafic de données à très haut débit, les méthodes d’ordonnancement du traitement en bande de base doivent être adaptées aux spécificités de l'interface radio. Plus précisément, nous proposons une décomposition fonctionnelle de l'interface-air 5G qui se prête à des implémentations logicielles multicœurs ciblant des serveurs haut de gamme exploitant l'accélération de données multiples à instruction unique (SIMD). De plus, nous fournissons quelques pistes pour le traitement multithread via le pipelining et l'utilisation de pools de threads. Nous mettons en évidence les méthodes et la caractérisation de leur performances qui ont été exploitées lors du développement de l'implémentation OpenAirInterface 5G
The thesis deals with 5G real-time Software Defined Radio architectures. In order to match 5G performance requirements, computational acceleration combined with real-time process scheduling methods are required. In 5G embedded systems acceleration amounts to a judicious combination additional hardware units for the most computationally costly functions with software for simpler arithmetic and complex control procedures. Fully software-based solutions are also appearing for certain applications, in particular in the so-called Open Radio-Access Network (openRAN) ecosystem. The contributions of this thesis lie in methods for purely software-based acceleration and real-time control of low-latency fronthaul interfaces. Since 5G has stringent latency requirements and support for very high-speed data traffic, methods for scheduling baseband processing need to be tailored to the specifics of the air-interface. Specifically, we propose a functional decomposition of the 5G air interface which is amenable to multi-core software implementations targeting high-end servers exploiting single-instruction multiple-data (SIMD) acceleration. Moreover, we provide some avenues for multi-threaded processing through pipelining and the use of thread pools. We highlight the methods and their performance evaluation that have been exploited during the development of the OpenAirInterface 5G implementation

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Iturbe, Xabier. "Design and implementation of a reliable reconfigurable real-time operating system (R3TOS)". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/9413.

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Twenty-first century Field-Programmable Gate Arrays (FPGAs) are no longer used for implementing simple “glue logic” functions. They have become complex arrays of reconfigurable logic resources and memories as well as highly optimised functional blocks, capable of implementing large systems on a single chip. Moreover, Dynamic Partial Reconfiguration (DPR) capability permits to adjust some logic resources on the chip at runtime, whilst the rest are still performing active computations. During the last few years, DPR has become a hot research topic with the objective of building more reliable, efficient and powerful electronic systems. For instance, DPR can be used to mitigate spontaneously occurring bit upsets provoked by radiation, or to jiggle around the FPGA resources which progressively get damaged as the silicon ages. Moreover, DPR is the enabling technology for a new computing paradigm which combines computation in time and space. In Reconfigurable Computing (RC), a battery of computation-specific circuits (“hardware tasks”) are swapped in and out of the FPGA on demand to hold a continuous stream of input operands, computation and output results. Multitasking, adaptation and specialisation are key properties in RC, as multiple swappable tasks can run concurrently at different positions on chip, each with custom data-paths for efficient execution of specific computations. As a result, considerable computational throughput can be achieved even at low clock frequencies. However, DPR penetration in the commercial market is still testimonial, mainly due to the lack of suitable high-level design tools to exploit this technology. Indeed, currently, special skills are required to successfully develop a dynamically reconfigurable application. In light of the above, this thesis aims at bridging the gap between high-level application and low-level DPR technology. Its main objective is to develop Operating System (OS)-like support for high-level software-centric application developers in order to exploit the benefits brought about by DPR technology, without having to deal with the complex low-level hardware details. The developed solution in this thesis is named as R3TOS, which stands for Reliable Reconfigurable Real-Time Operating System. R3TOS defines a flexible infrastructure for reliably executing reconfigurable hardware-based applications under real-time constraints. In R3TOS, the hardware tasks are scheduled in order to meet their computation deadlines and allocated to non-damaged resources, keeping the system fault-free at all times. In addition, R3TOS envisages a computing framework whereby both hardware and software tasks coexist in a seamless manner, allowing the user to access the advanced computation capabilities of modern reconfigurable hardware from a software “look and feel” environment. This thesis covers all of the design and implementation aspects of R3TOS. The thesis proposes a novel EDF-based scheduling algorithm, two novel task allocation heuristics (EAC and EVC) and a novel task allocation strategy (called Snake), addressing many RC-related particularities as well as technological constraints imposed by current FPGA technology. Empirical results show that these approaches improve on the state of the art. Besides, the thesis describes a novel way to harness the internal reconfiguration mechanism of modern FPGAs to performinter-task communications and synchronisation regardless of the physical location of tasks on-chip. This paves the way for implementing more sophisticated RC solutions which were only possible in theory in the past. The thesis illustrates R3TOS through a proof-of-concept prototype with two demonstrator applications: (1) dependability oriented control of the power chain of a railway traction vehicle, and (2) datastreaming oriented Software Defined Radio (SDR).

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Zhang, Boyang. "Real-time software-defined-radio implementation of time-slotted carrier synchronization for distributed beamforming". Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-050509-200154/.

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Thesis (M.S.)--Worcester Polytechnic Institute.
Keywords: distributed beamforming; carrier synchronization; software-defined-radio; sensor networks; wireless networks; cooperative transmission; virtual antenna arrays. Includes bibliographical references (leaves 168-169).

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Marojevic, Vuk. "Computing resource management in software-defined and cognitive radios". Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/78033.

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Our research aims at contributing to the evolution of modern wireless communications and to the development of software-defined radio (SDR) and cognitive radio, in particular. It promotes a general resource management framework that facilitates the integration of computing and radio resource management. This dissertation discusses the need for computing resource management in software-defined and cognitive radios and introduces an SDR computing resource management framework with cognitive capabilities. The hard real-time computing requirements of software-defined digital signal processing chains (SDR applications), the associated radio propagation and quality of service (QoS) implications, and heterogeneous multiprocessor platforms with limited computing resources (SDR platforms) define the context of these studies. We examine heterogeneous computing techniques, multiprocessor mapping and scheduling in particular, and elaborate a flexible framework for the dynamic allocation and reallocation of computing resources for wireless communications. The framework should facilitate partial reconfigurations of SDR platforms, dynamic switches between radio access technologies (RATs), and service and QoS level adjustments as a function of the environmental conditions. It, therefore, assumes the facilities of the platform and hardware abstraction layer operating environment (P-HAL-OE). We suggest a modular framework, distinguishing between the computing system modeling and the computing resource management. Our modeling proposal is based on two computing resource management techniques, which facilitate managing the strict timing constraints of real-time systems. It is scalable and can account for many different hardware architectures and computing resource types. This work focuses on processing and interprocessor bandwidth resources and processing and data flow requirements. Our computing resource management approach consists of a general-purpose mapping algorithm and a cost function. The independence between the algorithm and the cost function facilitates implementing many different computing resource management policies. We introduce a dynamic programming based algorithm, the tw-mapping, where w controls the decision window. We present a general and parametric cost function, which guides the mapping process under the given resource constraints. An instance of it facilitates finding a mapping that meets all processing and data flow requirements of SDR applications with the available processing and bandwidth resources of SDR platforms. Several SDR reconfiguration scenarios and analyses based on simulations demonstrate the suitability and potentials of our framework for a flexible computing resource management. We extend our SDR computing resource management concepts to the cognitive radio context. The two primary objectives of cognitive radio are highly reliable communications whenever and wherever needed and the efficient use of the radio spectrum. We formulate a third objective as the efficient use of computing resources. We analyze the cognitive capabilities of our framework─the cognitive radio’s interface to SDR platforms─and indicate the potentials of our cognitive computing resource management proposal. The cognitive computing resource management needs to be coordinated with the radio resource management. We, therefore, introduce the joint resource management concept for cognitive radios. We present three cognitive cycles and discuss several interrelations between the radio, computing, and application resources, where application resources refer to the available SDR and user applications. Our approach potentiates flexibility and facilitates radio against computing resource tradeoffs. It promotes cognition at all layers of the wireless system for a cooperative or integrated resource management that may increase the performance and efficiency of wireless communications.
El objetivo de las investigaciones que se están llevando a cabo dentro del grupo de investigación es contribuir a la evolución de las radiocomunicaciones modernas y, en particular, al desarrollo de los conceptos software radio (SDR) y cognitive radio. El planteamiento general es el de extender la flexibilidad global del sistema de comunicaciones planteando la definición y desarrollo de un entorno en el que pudiesen explorarse las relaciones entre la computación y las prestaciones del sistema de comunicaciones móviles facilitando la integración de los recursos de computación con los recursos radio. Dentro de este marco, la presente tesis plantea la discusión de la necesidad de la gestión de los recursos de computación en entornos SDR y cognitive radio y define un entorno de operación que asume las características especificas del concepto SDR a la vez que incorpora capacidades cognitivas en la gestión de los recursos de computación de las plataformas que den soporte a las nuevas generaciones de sistemas móviles. Los estrictos requerimientos de procesado en tiempo real de las cadenas de procesado digital de la señal definidas por software (aplicaciones SDR), las implicaciones asociadas con la propagación radio y el concepto de calidad de servicio (QoS) y plataformas heterogéneas de múltiples procesadores con recursos de computo limitados (plataformas SDR) definen el contexto de estos estudios. Se examinan técnicas de cómputo de propósito general para definir un entorno de operación que fuese capaz de asignar de forma flexible y dinámica los recursos de cómputo necesarios para facilitar las radiocomunicaciones a los niveles de QoS deseados. Ello debería facilitar los cambios dinámicos de una tecnología de acceso radio a otra, permitiendo el ajuste del tipo de servicio o calidad de servicio en función de las preferencias de los usuarios y las condiciones del entorno. Dicho entorno de operación asume las potencialidades del platform and hardware abstraction layer operating environment (P-HAL-OE). La estructura del entorno de operación se define de forma modular y consiste en un modelado genérico y flexible de las plataformas de computación SDR y en una gestión de recursos de computación abierta y capaz de ajustarse a diferentes objetivos y políticas. En el trabajo se exponen dos técnicas de gestión que pretenden asegurar la consecución estricta de los límites temporales típicos de los sistemas en tiempo real. En cuanto al modelado, este es escalable y capaz de capturar un amplio abanico de arquitecturas hardware y recursos de computación. En el presente trabajo nos centramos en los recursos y requerimientos del procesado y transferencia de datos. Se introduce un algoritmo de mapeo genérico e independiente de la función de coste. La independencia entre el algoritmo y la función de coste facilita la implementación de diferentes políticas de gestión de recursos computacionales. El tw-mapping es un algoritmo basado en dynamic programming, donde w controla la ventana de decisión. Se presenta una función de coste genérica y parametrizable que permite guiar el proceso de gestión de los recursos. Una instancia de ella facilita encontrar una solución al proceso de asignación de recursos que cumpla todos los requerimientos de procesado y trasferencia de datos de las aplicaciones SDR con los recursos disponibles de las plataformas SDR. Diferentes escenarios y varios análisis basados en simulaciones demuestran la adecuación del entorno de trabajo definido y desarrollado, así como sus potencialidades para una gestión flexible de los recursos de cómputo. Se extienden los conceptos mencionados previamente para entornos cognitive radio. Los principales objetivos del concepto cognitive radio son la disponibilidad de comunicaciones altamente robustas en cualquier lugar y momento en que sean necesarias y el uso eficiente del espectro. Como tercer objetivo formulamos el uso eficiente de los recursos de cómputo. Analizamos las capacidades cognitivas de nuestro entorno de operación─la interfaz del sistema cognitive radio a las plataformas SDR─y resaltamos las potencialidades de nuestra propuesta de gestión cognitiva de los recursos computacionales. Dicha gestión cognitiva de los recursos computacionales plantea una integración con la gestión de los recursos radio. Para ello introducimos el concepto de gestión de recursos conjunta para entornos cognitive radio. Se presentan tres ciclos cognitivos y se discuten algunas interrelaciones entre los recursos radio, de cómputo y de aplicación, donde los recursos de aplicación se refieren a las aplicaciones SDR y de usuario disponibles. Nuestra propuesta de gestión de recursos conjunta potencia la flexibilidad y facilita los intercambios entre recursos radio y de computación

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Reed, Rachel E. "Real-Time Implementation and Analysis of Chip Shape-based Software Defined Receiver". University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493634316594274.

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Karlsson, David. "Hardware for positioning applications using software defined radio : High speed interfaces with real time constraints". Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6105.

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This thesis has theoretically and practically evaluated interfaces between a radio front end for GPS and a mobile platform to answer the question how should this interface be designed to minimize the computational load on the platform as well as costs. Benchmarking of serial peripheral interface and a glueless one bit interface is performed on MPC5200 and OMAP 1710 running Linux operating system.

The conclusion is two different design approaches, one based on serial peripheral interface and one on SDIO card.

Buffer sizes in the platform and the front end is the key factor for computational load and this is discussed in detail. Also other consideration for interface design is discussed such as the implications of front end being master or slave on the bus.

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Fang, Hongjie [Verfasser] y Roman [Gutachter] Obermaisser. "Execution environment for integrated real-time systems based on software-defined networking / Hongjie Fang ; Gutachter: Roman Obermaisser". Siegen : Universitätsbibliothek der Universität Siegen, 2019. http://d-nb.info/1213521734/34.

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Kippenberger, Roger Miles. "On Real Time Digital Phase Locked Loop Implementation with Application to Timing Recovery". Thesis, University of Canterbury. Electrical and Computer Engineering, 2006. http://hdl.handle.net/10092/1146.

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In digital communication systems symbol timing recovery is of fundamental importance. The accuracy in estimation of symbol timing has a direct effect on received data error rates. The primary objective of this thesis is to implement a practical Digital Phase Locked Loop capable of accurate synchronisation of symbols suffering channel corruption typical of modern mobile communications. This thesis describes an all-software implementation of a Digital Phase Locked in a real-time system. A timing error detection (TED) algorithms optimally implemented into a Digital Signal Processor. A real-time transmitter and receiver system is implemented in order to measure performance when the received signal is corrupted by both Additive White Gaussian Noise and Flat Fading. The Timing Error Detection algorithm implemented is a discrete time maximum likelihood one known as FFML1, developed at Canterbury University. FFML1 along with other components of the Digital Phase Locked loop are implemented entirely in software, using Motorola 56321 assembly language.

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Libros sobre el tema "Real-time software-defined radio systems"

Beattie, R. Mark, Anil Dhawan y John W.L. Puntis. Acute liver failure. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198569862.003.0063.

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Definition 476Aetiology 476Therapy 480Complications 480Transplantation 484Liver support system 484Prognosis 485Acute liver failure (ALF) in children is defined as ‘a rare multisystem disorder in which severe impairment of liver function, with or without encephalopathy, occurs in association with hepatocellular necrosis in a patient with no recognized underlying chronic liver disease’. Liver function is considered severely impaired if prothrombin time (PT) is >15 s or international normalized ratio (INR) is >1.5 and not corrected by vitamin K, in the presence of hepatic encephalopathy (HE) or a PT >20 s or INR >2.0 in the absence of HE....

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Robert, Philippe, Elsa Leone, Hélène Amieva y David Renaud. Managing behavioural and psychological symptoms in Alzheimer’s disease. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198779803.003.0009.

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This chapter focuses on the behavioural and psychological symptoms of Alzheimer's disease and the different approaches clinicians can take in their treatment of the condition. The behavioural and psychological symptoms are defined as primary manifestations of cerebral dysfunction, and appear specifically as a result of damage to a system or circuit such as the limbic system or the cortico-subcortical circuits. During the progression of Alzheimer’s disease, the presence of at least one BPSD is common and can vary, depending especially on the severity of the dementia-related syndrome at the time of diagnosis. Management of BPSD should preferentially be based on non-pharmacologic approaches first. Pharmacologic treatments should constitute second line treatment and are to be prescribed only after assessment of the individual risk:benefit ratio.

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Sherwood, Dennis y Paul Dalby. Chemical equilibrium and chemical kinetics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198782957.003.0014.

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Building on the previous chapter, this chapter examines gas phase chemical equilibrium, and the equilibrium constant. This chapter takes a rigorous, yet very clear, ‘first principles’ approach, expressing the total Gibbs free energy of a reaction mixture at any time as the sum of the instantaneous Gibbs free energies of each component, as expressed in terms of the extent-of-reaction. The equilibrium reaction mixture is then defined as the point at which the total system Gibbs free energy is a minimum, from which concepts such as the equilibrium constant emerge. The chapter also explores the temperature dependence of equilibrium, this being one example of Le Chatelier’s principle. Finally, the chapter links thermodynamics to chemical kinetics by showing how the equilibrium constant is the ratio of the forward and backward rate constants. We also introduce the Arrhenius equation, closing with a discussion of the overall effect of temperature on chemical equilibrium.

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Hendrickx, Jan F. A., André van Zundert y Andre De Wolf. Inhaled anaesthetics. Editado por Michel M. R. F. Struys. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199642045.003.0014.

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Inhaled anaesthetic drugs are administered via the lungs to provide ‘general anaesthesia’. They are considered complete anaesthetics because they in and by themselves can in most patients ensure all clinical end-points that are required for ‘general anaesthesia’ (unconsciousness, immobility, and haemodynamic stability). The dose–response curve of each clinical end-point is conveniently defined by its mid-point, the end-expired concentration Fa that ensures response suppression in 50 % of the patients (MACawake, MAC, and MACBAR). By understanding the dose–response curves and the factors that influence them (pharmacodynamics), the target Fa and the dose of other drugs can be selected in each individual patient. This target Fa is achieved by adjusting the carrier fresh gas flow (O2, air, N2O) and agent vaporizer setting Fd. ‘Pharmacokinetics’ is the study of the factors that affect the partial pressure cascade from the vaporizer down to the site of action. Because IADs are transported down a partial pressure gradient, Fa will always try to approach the inspired concentration Fi, a process that is described by the Fa/Fi ratio over time. Both Fa and Fi are routinely measured. N2O remains widely used, with scientific scrutiny rather than belief finally delineating its advantages and disadvantages. Xenon, the near-ideal agent, is discussed briefly because it may enter clinical practice despite its cost because of its potential advantages in a yet to be defined subgroup of high-risk patients. The carrier gas N2 is often overlooked, but deserves careful analysis to help the reader understand how rebreathing affects its kinetics in a circle breathing system.

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De Laurentis, Giacomo, Eugenio Alaio, Elisa Corsi, Emanuelemaria Giusti, Marco Guairo, Carlo Palego, Luca Paulicelli et al. Rischio di credito 2.0. AIFIRM, 2021. http://dx.doi.org/10.47473/2016ppa00030.

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The EBA Guidelines on loan origination and monitoring (hereinafter "GL LOM") undoubtedly represent a substantially new piece of the banking regulatory framework. In fact, for the first time, the regulator moves into a topic that was traditionally outside the scope of financial regulation, so far almost exclusively focused on aspects directly linked to both micro- and macro-prudential stability, notably through capital and liquidity management requirements and guidelines on Business Model and Internal Governance. The credit management process, and in particular loan origination and monitoring, has always been typically considered as a business issue under sole responsibility of banks, as it is considered one of the "core" processes (if not the "core" process) of the banking business. As a matter of fact, since the issue of the capital requirement regulation (i.e., Basel II and Basel III), and the introduction of the use requirements for the rating systems, the regulator moved very close, but not yet, to prescribe specific credit assessment criteria, while dictating methodological and organizational requirements for the authorization of the rating systems, and leaving substantial freedom to banks to define their own models and embedded assessment criteria and indicators. With the GL LOM, the regulator takes a further step, remarkably beyond its traditional remit, dictating principles and rules for the evaluation of the credit quality of borrowers. The starting point for this new approach from the regulator can be found in the ECB guidelines on Non-Performing Loans, later endorsed by the Bank of Italy Guidelines for Less Significant Banks, aimed at encouraging banks to define their NPL management processes and establish reduction plans to achieve NPL ratio targets in line with the regulator's expectations. Consistently with the focus on NPL, the regulation on Calendar Provisioning, amending the CRR was issued; as being a Regulation, it involves all banks, and not only significant ones (for which the ECB Addendum also applies). In addition, the new definition of default (the so-called "new Dod") has defined stricter criteria for the transition of exposures to the default status and also made the return of "cured" exposures to the performing status more difficult. The combined effect of these regulatory changes has been to make the default of counterparties not only more probable but also much more "expensive" for the banks. The natural “next step” of these regulatory changes was to "move backward" into the management process covering loan origination and monitoring . The EBA's stated objective with the issuance of the GL LOM is to define "robust and prudent" standards of lending practices so as to maintain a low level of NPLs in the future. Therefore, the focus of the GL LOM is the definition of requirements (some outlined as prescriptions, others in terms of principles) for the creditworthiness assessment of counterparties and for the management of the related data and information. Notwithstanding the fact that the Final Report has articulated the principle of proportionality much more clearly as compared to the Consultation Paper, the GLs set out three macro-categories of counterparties for which specific requirements are defined: • Individuals • Micro and small businesses • Medium and large companies. The GL LOM also provide recommendations about the valuation of guarantees both at origination and during ongoing monitoring, encouraging the use of advanced statistical models. The GL LOM focus on real estate guarantees, while financial collateral is outside the scope of the GL LOM. In the mind of the regulator, the GL LOM should not only reflect industry practices, but also incorporate the latest supervisory guidance on lending, and provide the stimulus to include ESG, AML/CTF and the use of innovative technologies into banking origination and, where applicable, monitoring processes.

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Dowd, Cate. Digital Journalism, Drones, and Automation. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190655860.001.0001.

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Advances in online technology and news systems, such as automated reasoning across digital resources and connectivity to cloud servers for storage and software, have changed digital journalism production and publishing methods. Integrated media systems used by editors are also conduits to search systems and social media, but the lure of big data and rise in fake news have fragmented some layers of journalism, alongside investments in analytics and a shift in the loci for verification. Data has generated new roles to exploit data insights and machine learning methods, but access to big data and data lakes is so significant it has spawned newsworthy partnerships between media moguls and social media entrepreneurs. However, digital journalism does not even have its own semantic systems that could protect the values of journalism, but relies on the affordances of other systems. Amidst indexing and classification systems for well-defined vocabulary and concepts in news, data leaks and metadata present challenges for journalism. By contrast data visualisations and real-time field reporting with short-form mobile media and civilian drones set new standards during the European asylum seeker crisis. Aerial filming with drones also adds to the ontological base of journalism. An ontology for journalism and intersecting ontologies can inform the design of new semantic learning systems. The Semantic CAT Method, which draws on participatory design and game design, also assists the conceptual design of synthetic players with emotion attributes, towards a meta-model for learning. The design of context-aware sensor systems to protect journalists in conflict zones is also discussed.

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Capítulos de libros sobre el tema "Real-time software-defined radio systems"

Abdullahi, Aliyu Buba, Rafael F. S. Caldeirinha, Akram Hammoudeh, Leshan Uggalla y Jon Eastment. "Real Time Multiuser-MIMO Beamforming/Steering Using NI-2922 Universal Software Radio Peripheral". En Lecture Notes in Networks and Systems, 28–50. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12388-8_3.

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Liu, Weili, Cheng Jin, Jiajun Bu y Chun Chen. "Real-Time Expression Mapping with Ratio Image". En Embedded Software and Systems, 586–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11599555_56.

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Goswami, Bhargavi, Shuwen Hu y Yanming Feng. "Software-Defined Networking for Real-Time Network Systems". En Handbook of Real-Time Computing, 935–59. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-287-251-7_69.

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Goswami, Bhargavi, Shuwen Hu y Yanming Feng. "Software-Defined Networking for Real-Time Network Systems". En Handbook of Real-Time Computing, 1–25. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-4585-87-3_69-1.

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Savvidis, Dimitrios, Janis Marrek y Dietmar Tutsch. "Software-Defined Networking with Prioritization for a Redundant Network Topology Called Double Wheel Topology". En Real-time and Autonomous Systems 2022, 82–87. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32700-1_9.

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Tonello, Andrea M., Nicola Laurenti y Silvano Pupolin. "Capacity Considerations on the Uplink of a Multi-user DMT OFDMA System Impaired by Time Misalignments and Frequency Offsets". En Software Radio, 93–104. London: Springer London, 2001. http://dx.doi.org/10.1007/978-1-4471-0343-1_8.

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Oechsle, Stefan, Moritz Walker, Marc Fischer, Florian Frick, Armin Lechler y Alexander Verl. "Real-Time Capable Architecture for Software-Defined Manufacturing". En Advances in Automotive Production Technology – Towards Software-Defined Manufacturing and Resilient Supply Chains, 3–13. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27933-1_1.

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AbstractProduction systems are characterized by static configurations and slow adaption to changing requirements. They no longer meet current trends in mutability and dynamic adaptation. Software-defined Manufacturing (SDM) like other software-defined approaches leverages abstraction of hardware to achieve higher flexibility. Based on abstracted hardware, software defines desired functionalities. Requirements from the Operational Technology (OT), especially determinism, must be combined with the flexibility and interoperability of Information Technology (IT). This paper proposes a stack that enables the implementation of SDM based on a requirements analysis. It covers the main phases of the life cycle of automation applications and additional requirements from SDM. We derive the necessary components while resorting to existing approaches whenever possible. Means for applications engineering, configuration, deployment, and orchestration, as well as execution at run time, are developed.

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Marriwala, Nikhil, O. P. Sahu y Anil Vohra. "Real-Time Analysis of Low-Cost Software-Defined Radio Transceiver Using ZigBee Protocol". En International Conference on Intelligent Computing and Smart Communication 2019, 1151–69. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0633-8_115.

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Vishnupriya, A., Hirankumar Singh y V. Surya Prakash Reddy. "Self-Regulating Real-Time Server Log Monitoring Using Software-Defined Networking". En Proceedings of Third International Conference on Communication, Computing and Electronics Systems, 933–42. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8862-1_61.

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Shaolong, Zhi, Fang Dong, Liu Xun, Li Yu y Huang Haining. "Modularized Real-Time Communication Modem Design Based on Software Defined Radio of Underwater Acoustic Network". En Proceedings of the 2012 International Conference on Communication, Electronics and Automation Engineering, 1197–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31698-2_168.

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Actas de conferencias sobre el tema "Real-time software-defined radio systems"

Jung Ko, V. C. Gaudet y R. Hang. "Tier 3 software defined AM radio". En Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05). IEEE, 2005. http://dx.doi.org/10.1109/iwsoc.2005.31.

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Sarbu, Annamaria, Emil Sorecau, Mirela Sorecau, Simona Miclaus y Paul Bechet. "Real-time isotropic measurement system based on Software Defined Radio". En 2022 IEEE 9th Electronics System-Integration Technology Conference (ESTC). IEEE, 2022. http://dx.doi.org/10.1109/estc55720.2022.9939503.

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Özkan, Lütfullah, Saliha Büyükçorak y Güneş Karabulut Kurt. "Real-Time RF Energy Harvesting System with Software Defined Radio". En 2023 31st Signal Processing and Communications Applications Conference (SIU). IEEE, 2023. http://dx.doi.org/10.1109/siu59756.2023.10223829.

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Egbert, Austin, Benjamin H. Kirk, Charles Baylis, Anthony Martone y Robert J. Marks. "Fast Software-Defined Radio-based System Performance Evaluation for Real-time Adaptive RF Systems". En 2020 95th ARFTG Microwave Measurement Conference (ARFTG). IEEE, 2020. http://dx.doi.org/10.1109/arftg47271.2020.9241369.

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Robert, Helbet, Bechet Paul, Miclaus Simona y Sarbu Annamaria. "Real Time Broadband Electromagnetic Spectrum Monitoring System based on Software Defined Radio Technology". En 2021 9th International Conference on Modern Power Systems (MPS). IEEE, 2021. http://dx.doi.org/10.1109/mps52805.2021.9492577.

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Nayak, Monalisa, Urmila Bhanja, Debapriya Parida, Dillip Dash y Kodanda Dhar Sa. "A real time implementation of spectrum sensing system using software defined radio". En 2017 International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT). IEEE, 2017. http://dx.doi.org/10.1109/icicict1.2017.8342631.

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Liu, Xiong, Qiming Sun, Shuai Zhang, Kun Chen y Song Song. "Real-Time Transmission of ROF-FSO Hybrid System Using Software Defined Radio". En 2022 IEEE 10th International Conference on Information, Communication and Networks (ICICN). IEEE, 2022. http://dx.doi.org/10.1109/icicn56848.2022.10006420.

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Friedt, J. M., W. Feng, D. Rabus y G. Goavec-Merou. "Real time GNSS spoofing detection and cancellation on embedded systems using Software Defined Radio". En 2021 15th European Conference on Antennas and Propagation (EuCAP). IEEE, 2021. http://dx.doi.org/10.23919/eucap51087.2021.9411053.

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Terrazas Gonzalez, Jesus David y Wai-keung Fung. "A pilot study on aeronautical surveillance system for drone delivery using heterogeneous software defined radio framework". En 2017 IEEE International Conference on Real-time Computing and Robotics (RCAR). IEEE, 2017. http://dx.doi.org/10.1109/rcar.2017.8311912.

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Cheng, Xing y Ming Zhao. "A Method to Guarantee Real-Time for Software-Defined Radio in User-Space". En 2016 International Conference on Information System and Artificial Intelligence (ISAI). IEEE, 2016. http://dx.doi.org/10.1109/isai.2016.0070.

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Informes sobre el tema "Real-time software-defined radio systems"

Grabner, Mitchel y Michael Don. A Real-Time Software-Defined Radio Two-Way Ranging Protocol. DEVCOM Army Research Laboratory, noviembre de 2023. http://dx.doi.org/10.21236/ad1214908.

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Olsen. PR-179-07200-R01 Evaluation of NOx Sensors for Control of Aftertreatment Devices. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), junio de 2008. http://dx.doi.org/10.55274/r0010985.

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Emissions reduction through exhaust aftertreatment is becoming more common. It is likely to play an important role in meeting new emissions regulations in the future. Currently, the predominate aftertreatment technology for NOX reduction in lean burn natural gas engines appears to be selective catalytic reduction (SCR). In SCR, a reducing agent is injected into the exhaust upstream of a catalyst. Supplying the optimal quantity of reagent is critical to effective application of SCR. If too little reagent is supplied then the NOx reduction efficiency may be too low. If too much reagent is provided then the ammonia slip may be too high. Control of reagent injection is an area where improvements could be made. In many current SCR systems, the rate of reagent injection is determined by engine loading. The relationship between engine loading and engine out NOX emission is determined during SCR system commissioning, and assumed to remain constant. Ideally, NOX emissions would be measured and used as feedback to the SCR system. It may also be advantageous to employ transient reagent injection based on time dependent variations in NOX mass flow in the exhaust. This would be possible with a fast response NOx sensor. Close loop engine control is an area of increasing importance. As regulatory emissions levels are reduced, compliance margins generally decrease. Precise control of air/fuel ratio and ignition timing become more critical. Cylinder-to-cylinder control of air/fuel ratio, ignition timing, and IMEP are also important. Advanced sensors are an enabling technology for more precise engine control. Ion sensing is an example of a technology that potentially can improve cylinder balancing and ignition timing. Cylinder-to-cylinder air/fuel ratio can be accomplished in several different ways. One approach would be to install individual sensors in the exhaust manifold, one for each cylinder. Ceramic based sensors (O2 and NOx) may be reliable enough at exhaust port temperatures. They are typically used in the exhaust of 4-stroke cycle engines, which have higher exhaust temperatures than 2-stroke cycle engines. Ceramic based NOx sensors have been under development for use, primarily, in Lean NOx Traps (LNTs). This technology is expected to be used on over-the-road Diesel truck engines in 2010. Therefore, the research effort has momentum. This provides an opportunity to capitalize on the efforts of another industry. In this project a NOx sensor will be evaluated using the SCR slipstream system on the GMV-4TF. The basic tasks are: 1. Identify commercial NOx sensors and procure most promising sensor 2. Design and modification of SCR slipstream system to accept sensors 3. Installation of sensors, sensor electronics, and data logging hardware and software 4. Sensor evaluation during SCR slipstream testing.

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