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Academic literature on the topic 'Émetteurs-récepteurs radio'
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Dissertations / Theses on the topic "Émetteurs-récepteurs radio"
Gourrinat, Alexis. "Contribution à l'étude d'architectures de systèmes radio fréquence à forte intégration." Bordeaux 1, 2004. http://www.theses.fr/2004BOR12820.
Full textMonnerie, Guillaume. "Etude et modélisation de sources de bruit dans les structures à temps discret." Bordeaux 1, 2005. http://www.theses.fr/2005BOR12996.
Full textSuárez, Peñaloza Martha. "Architectures d'émetteurs pour des systèmes de communication multi-radio." Thesis, Paris Est, 2009. http://www.theses.fr/2009PEST1050.
Full textThis research deals with wireless multi-radio transmitter architectures operating in the frequency band of 800 MHz – 6GHz. As a consequence of the constant evolution in the communication systems, the mobile transmitters must be able to operate at different frequency bands and modes according to existing standards specifications. The concept of a unique multi-radio architecture is an evolution of the multi-standard transceiver characterized by a parallelization of circuits for each standard. Multi-radio concept optimizes surface and power consumption. This study concentrates on flexible multi-radio architectures. This kind of architectures could be used in the future for cognitive radio applications. The power amplifier (PA) is the key element in transmitter architectures. Its operating principle establishes a trade-off between power efficiency and linearity. The utilization of a switched mode amplifier allows improving efficiency performances but implies a review of the classical transmitter architectures. Within this context, some architectures transforming the input signal of the PA and that are candidates for multi-radio applications are considered. In particular, three architectures have been analyzed and compared: the polar architecture with sigma-delta envelope modulator, the polar architecture with pulse width modulator and the cartesian sigma delta architecture. Validation is accomplished with the most critical signals in terms of power dynamics and frequency bandwidth; these are the LTE and mobile WiMAX. At the amplifier output, the band-pass filter plays a key role and many filtering technologies could be envisaged. In particular, we are interested in the BAW technology (Bulk Acoustic Wave) and a filter bank has been synthesized. This research has quantified the key performances of a high efficiency multi-radio transmitter by analyzing the system from baseband signal treatment to RF filtering before the antenna
Badarou, Aminath. "Etude et développement d'une architecture radio numérique innovante dans le contexte des communications aéronautiques." Nantes, 2013. https://archive.bu.univ-nantes.fr/pollux/show/show?id=ff1c4015-9326-4850-a7cd-eacee52850cc.
Full textAir traffic evolution around the word result in high air navigation equipments needs. This PhD study focuses on a new digital architecture for UHF (225 MHz – 400 MHz) and VHF (118 MHz -144 MHz) transmitter in aeronautical communications context. New architecture for both current systems and futures systems (which is presently being specified) like LDACS-1 and LDACS-2 systems has to be proposed. The best architecture choice is related to the amplification stage linearization techniques used. This work was carried out in three main steps. First, the best architecture choice suited to our application is made. The second step of the study is dedicated to the architecture digital implementation. Last but no least step is devoted to the experimental validation which allow to assess the system performances
Camurati, Giovanni. "Security Threats Emerging from the Interaction Between Digital Activity and Radio Transceiver." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS279.
Full textModern connected devices need both computing and communication capabilities. For example, smartphones carry a multi-core processor, memory, and several radio transceivers on the same platform. Simpler embedded systems often use a mixed-signal chip that contains both a microcontroller and a transceiver. The physical proximity between digital blocks, which are strong sources of electromagnetic noise, and radio transceivers, which are sensitive to such noise, can cause functional and performance problems. Indeed, there exist many noise coupling paths between components on the same platform or silicon die. In this thesis we explore the security issues that arise from the interaction between digital and radio blocks, and we propose two novel attacks. With Screaming Channels, we demonstrate that radio transmitters on mixed-signal chips might broadcast some information about the digital activity of the device, making side channel attacks possible from a large distance. With Noise-SDR, we show that attackers can shape arbitrary radio signals from the electromagnetic noise triggered by software execution, to interact with radio receivers, possibly on the same platform
Araújo, Moreira Nicolas de. "On heterogeneous networks under non-Gaussian interferences : experimental and theoretical aspects." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I041/document.
Full textInternet of Things represents a technical challenge for 5G communications due to is characteristic heterogeneity: the 2.4 GHz ISM band, for example, is shared between different kind of technologies, such Wifi, Bluetooth and Zigbee. In addition to the loss of quality of communication, recent studies show that interference increases significantly the energy consumption. So, dealing with interference becomes an important task to ensure successfull data transmission. The present thesis approaches two aspects of heterogeneous networks. The first part presents an experimental study on the nature of interference between IEEE 802.11 and IEEE 802.15.4 devices, its impacts on the communication reliability and proposes an statistical description of it. The main conclusion of this part is that, on this context, the interference may present a non-Gaussian behavior, more precisely, an impulsive behavior. Recent theoretical works allied with these experimental results show that the α-stable distribution is more adequate to represent impulsive noises. It means that the, once optimal, classical communication architectures based on the Gaussian assumption, particularly the Least Squares based channel estimation and linear receiver, are not optimal anymore present a significant loss of performance. The second part presents a robust MIMO architecutre based on Alamouti coding, supervised channel estimation based on Least Absolute Deviation and p-norm receiver with an estimator for p. The proposed approach outperforms the classical method
Alam, Md Zahangir. "Joint transceiver design and power optimization for wireless sensor networks in underground mines." Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30663.
Full textWith the great developments in wireless communication technologies, Wireless Sensor Networks (WSNs) have gained attention worldwide in the past decade and are now being used in health monitoring, disaster management, defense, telecommunications, etc. Such networks are used in many industrial and consumer applications such as industrial process and environment monitoring, among others. A WSN network is a collection of specialized transducers known as sensor nodes with a communication link distributed randomly in any locations to monitor environmental parameters such as water level, and temperature. Each sensor node is equipped with a transducer, a signal processor, a power unit, and a transceiver. WSNs are now being widely used in the underground mining industry to monitor environmental parameters, including the amount of gas, water, temperature, humidity, oxygen level, dust, etc. The WSN for environment monitoring can be equivalently replaced by a multiple-input multiple-output (MIMO) relay network. Multi-hop relay networks have attracted significant research interest in recent years for their capability in increasing the coverage range. The network communication link from a source to a destination is implemented using the amplify-and-forward (AF) or decode-and-forward (DF) schemes. The AF relay receives information from the previous relay and simply amplifies the received signal and then forwards it to the next relay. On the other hand, the DF relay first decodes the received signal and then forwards it to the next relay in the second stage if it can perfectly decode the incoming signal. For analytical simplicity, in this thesis, we consider the AF relaying scheme and the results of this work can also be developed for the DF relay. The transceiver design for multi-hop MIMO relay is very challenging. This is because at the L-th relay stage, there are 2L possible channels. So, for a large scale network, it is not economical to send the signal through all possible links. Instead, we can find the best path from source-to-destination that gives the highest end-to-end signal-to-noise ratio (SNR). We can minimize the mean square error (MSE) or bit error rate (BER) objective function by sending the signal using the selected path. The set of relay in the path remains active and the rest of the relays are turned off which can save power to enhance network life-time. The best path signal transmission has been carried out in the literature for 2-hop MIMO relay and for multiple relaying it becomes very complex. In the first part of this thesis, we propose an optimal best path finding algorithm at perfect channel state information (CSI). We consider a parallel multi-hop multiple-input multiple-output (MIMO) AF relay system where a linear minimum mean-squared error (MMSE) receiver is used at the destination. We simplify the parallel network into equivalent series multi-hop MIMO relay link using best relaying, where the best relay ...
Massiani, Arnaud. "Prototypage de systèmes Haut Débit combinant Étalement de spectre, Multi-porteuses et Multi-antennes." Rennes, INSA, 2005. http://www.theses.fr/2005ISAR0015.
Full textModern communication networks are now confronted with increasing needs in terms of data rates and mobility. The fourth generation developments relies on both new transmission techniques and on improved hardware architectures. The so-called MC-CDMA modulation scheme has recently emerged as one of the most promising technique for future networks physical layer. This modulation scheme combines multi-carrier modulations and spread spectrum technique. The emergence of MIMO techniques provides more data rate or more robustness. The combination of both techniques assumed to be a good compromise in order to meet wide mobility and high data rates constraints. This thesis deals with the study and the implementation of MC-CDMA communication systems and of MC-CDMA combined with MIMO systems. It also considers the definition and the optimization of appropriate design methods on heterogeneous architectures. This work has been done for European MATRICE project and for the Brittany area PALMYRE project. Following a general description of the context and of MC-CDMA, MIMO related principles, a well-proportioned system is presented. Implementation complexity on a mixed DSP-FPGA prototyping board is then analyzed for both systems. MCSE codesign methodology is then considered for MC-CDMA system and MIMO-MC-CDMA system design. The complete design flow is then detailed for both systems. The great interest of these methodologies for such systems optimization is then demonstrated
Debroucke, Romain. "Développements de capacités variables en technologie silicium pour les applications RF et mmW." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10135.
Full textMultiplication of standards and communication protocols allows nowadays a wider range of services for each consumer. If this multiplication of standards is more significant for users, it creates an increased complexity of Rx/Tx communication modules both in RF (3G, 4G), or mmW (W-HDMI, imaging, radar, sensors ) range. These systems Rx/Tx must be able nowadays to support multiple frequency bands (tri-band mobilephone as an example), or agile functions generation, it is called reconfigurable systems. In this context, that this thesis work taking place which aims to address the challenge of high performances tunable capacitances development in RF and mmW range. The first chapter entitled "Emergence of the need for high performances non linear capacitances in silicon technology" identifies the limitations of usual tunable capacitances offer at STMicroelectronics. The second chapter " AttoFarad capacitance characterization: The Challenge of high impedance measurement" discuss the problem of characterization of very small capacity, called attoFarad, used mainly in digital controlled oscillator (DCO). Nowadays these aF capacitance are very difficult to modelize regarding problems of standard measurement methods. We will discuss of a new method for high frequency characteriziation with a relative precision of 50aF 1 to 10GHz. The third chapter entitled "From analog to digital, developments of tunable capacitances up to millimeter frequencies in CMOS and BiCMOS technologies," will focus on figures of merit improvements of the capacitance (tuning ration, resonant frequency, linear law...) through optimization of existing solution (MOS varactor) and the design of new digital architectures. The final chapter "Performances evaluation through referent mmW circuits " exhibit, the design, realization and characterization of two agile functions, a phase shifter and a in-situ tuner, both in the mmW range. To conclude, all these thesis work provide new solutions for the design of RF and mmW circuits. They have extended the tunable capacitances offer at STMicroelectronics in advanced technologie nodes but also to investigate and validate a new concept of characterization necessary for all of these developments
Zeleny, Jan. "Compensation numérique des non-linéarités des amplificateurs de puissance avec identification au niveau récepteur." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10039/document.
Full textIn this work a novel scheme of predistortion of power amplifier nonlinearities is developed and demonstrated. The originality of the proposed system architecture is that the estimation of nonlinearities is carried out at the receiver thanks to a training sequence, and sent back to the transmitter for predistortion. The proposed architecture achieves efficient compensation of power amplifier nonlinearities on WiMAX and LTE standards without extra hardware. An evaluation of consumption savings is carried out, considering digital consumption of the estimation algorithm at the receiver and predistortion Look Up Table refreshment at the transmitter. The results show that the suggested architecture can be applied for high data rate systems at base stations, relay stations and mobile stations as well
Books on the topic "Émetteurs-récepteurs radio"
Kopta, Vladimir, and Christian Enz. Ultra-Low Power FM-UWB Transceivers for IoT. River Publishers, 2020.
Find full textKopta, Vladimir, and Christian Enz. Ultra-Low Power FM-UWB Transceivers for IoT. River Publishers, 2022.
Find full textKopta, Vladimir, and Christian Enz. Ultra-Low Power FM-UWB Transceivers for IoT. River Publishers, 2022.
Find full textWaveform Design And Diversity For Advanced Radar Systems. Institution of Engineering & Technology (IET), 2011.
Find full textRhee, Woogeun. Wireless Transceiver Circuits. Taylor & Francis Group, 2015.
Find full textRhee, Woogeun. Wireless Transceiver Circuits: System Perspectives and Design Aspects. Taylor & Francis Group, 2018.
Find full textRhee, Woogeun. Wireless Transceiver Circuits: System Perspectives and Design Aspects. Taylor & Francis Group, 2018.
Find full textRhee, Woogeun. Wireless Transceiver Circuits: System Perspectives and Design Aspects. Taylor & Francis Group, 2018.
Find full textRhee, Woogeun. Wireless Transceiver Circuits: System Perspectives and Design Aspects. Taylor & Francis Group, 2018.
Find full textWireless Transceiver Circuits: System Perspectives and Design Aspects. Taylor & Francis Group, 2015.
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