Bibliographies thématiques / Imperfections RF

Littérature scientifique sur le sujet « Imperfections RF »

Auteur : Grafiati

Publié le 25 mai 2024

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Articles de revues sur le sujet "Imperfections RF"

Boulogeorgos, Alexandros-Apostolos A., Nestor D. Chatzidiamantis et George K. Karagiannidis. « Energy Detection Spectrum Sensing Under RF Imperfections ». IEEE Transactions on Communications 64, n^o 7 (juillet 2016) : 2754–66. http://dx.doi.org/10.1109/tcomm.2016.2561294.

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Polak, Adam C., et Dennis L. Goeckel. « Wireless Device Identification Based on RF Oscillator Imperfections ». IEEE Transactions on Information Forensics and Security 10, n^o 12 (décembre 2015) : 2492–501. http://dx.doi.org/10.1109/tifs.2015.2464778.

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Riener, Christian, Thomas Bauernfeind, Samuel Kvasnicka, Klaus Roppert, Herbert Hackl et Manfred Kaltenbacher. « Numerical Investigation of Signal Launch Imperfections for Edge Mount RF Connectors ». Electronics 11, n^o 13 (24 juin 2022) : 1990. http://dx.doi.org/10.3390/electronics11131990.

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In this paper, common practice RF design guidelines for SMA edge mount connectors are investigated in terms of numerical simulations and VNA measurements. These guidelines are used in a variety of applications for coaxial-to-planar interfaces but often do not provide information regarding the physical origins of increased insertion and transmission losses. The presented results in this work focus on different RF PCB design features and their impact on electromagnetic field distributions in the launching zone. The presented investigations should raise awareness on the issue of electromagnetic field resonances occurring in the RF frequency range and assist PCB design engineers to identify potential issues occurring at an coaxial-to-planar interface. The investigated PCB features facilitate a high performance RF PCB design up to a frequency of 26 GHz.

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Aigner, Christoph S., Armin Rund, Samy Abo Seada, Anthony N. Price, Joseph V. Hajnal, Shaihan J. Malik, Karl Kunisch et Rudolf Stollberger. « Time optimal control‐based RF pulse design under gradient imperfections ». Magnetic Resonance in Medicine 83, n^o 2 (23 août 2019) : 561–74. http://dx.doi.org/10.1002/mrm.27955.

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Sanogo, Lamoussa, Eric Alata, Alexandru Takacs et Daniela Dragomirescu. « Intrusion Detection System for IoT : Analysis of PSD Robustness ». Sensors 23, n^o 4 (20 février 2023) : 2353. http://dx.doi.org/10.3390/s23042353.

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The security of internet of things (IoT) devices remains a major concern. These devices are very vulnerable because of some of their particularities (limited in both their memory and computing power, and available energy) that make it impossible to implement traditional security mechanisms. Consequently, researchers are looking for new security mechanisms adapted to these devices and the networks of which they are part. One of the most promising new approaches is fingerprinting, which aims to identify a given device by associating it with a unique signature built from its unique intrinsic characteristics, i.e., inherent imperfections, introduced by the manufacturing processes of its hardware. However, according to state-of-the-art studies, the main challenge that fingerprinting faces is the nonrelevance of the fingerprinting features extracted from hardware imperfections. Since these hardware imperfections can reflect on the RF signal for a wireless communicating device, in this study, we aim to investigate whether or not the power spectral density (PSD) of a device’s RF signal could be a relevant feature for its fingerprinting, knowing that a relevant fingerprinting feature should remain stable regardless of the environmental conditions, over time and under influence of any other parameters. Through experiments, we were able to identify limits and possibilities of power spectral density (PSD) as a fingerprinting feature.

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Aebischer, Kathrin, Zdeněk Tošner et Matthias Ernst. « Effects of radial radio-frequency field inhomogeneity on MAS solid-state NMR experiments ». Magnetic Resonance 2, n^o 1 (1 juillet 2021) : 523–43. http://dx.doi.org/10.5194/mr-2-523-2021.

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Abstract. Radio-frequency field inhomogeneity is one of the most common imperfections in NMR experiments. They can lead to imperfect flip angles of applied radio-frequency (rf) pulses or to a mismatch of resonance conditions, resulting in artefacts or degraded performance of experiments. In solid-state NMR under magic angle spinning (MAS), the radial component becomes time-dependent because the rf irradiation amplitude and phase is modulated with integer multiples of the spinning frequency. We analyse the influence of such time-dependent MAS-modulated rf fields on the performance of some commonly used building blocks of solid-state NMR experiments. This analysis is based on analytical Floquet calculations and numerical simulations, taking into account the time dependence of the rf field. We find that, compared to the static part of the rf field inhomogeneity, such time-dependent modulations play a very minor role in the performance degradation of the investigated typical solid-state NMR experiments.

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Hamaty, Youssef R., et Alexander R. Tusnin. « Operation of braced steel frameworks with regard to assembly and fabrication errors ». Stroitel'stvo : nauka i obrazovanie [Construction : Science and Education] 13, n^o 1 (30 mars 2023) : 22–40. http://dx.doi.org/10.22227/2305-5502.2023.1.2.

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Introduction. As a building construction material, steel is widely used because of its high mechanical characteristics. Steel load-bearing structures of multi-storey buildings are a system formed by columns, beams, floor slabs and braces. The frame of a multi-storey building has a large number of elements and their connections. Errors in the fabrication, installation and operation of steel frames of multi-storey buildings can lead to a reduction in the load-bearing capacity of structures compared to the design. Deviations from the design position occur because of violations of the technical operatin.rules of the buildings beyond the permissible limits, design errors, imperfect standards and poor quality of work during the fabrication and installation of structures. The current Russian standards do not take into account the impact of fabrication and installation errors on the work of multi-storey frames. The initial geometric defects in the structural system and its individual elements contribute to the difference in performance between the real construction and an idealized one. Materials and methods. The study of the effect of initial imperfections on the stress-strain state of the steel frame is important and relevant. Initial imperfections are taken into account either by applying an equivalent load to the idealized design scheme or by forming a geometrically distorted by imperfections design scheme. The analysis can be linear or geometrically non-linear. Results. The results of the study of braced steel framework performance in the presence of initial imperfections are presented. The effect of initial imperfections in the form of deflection of columns from the vertical is considered. The values of the initial imperfections are determined in accordance with the current RF standards. Conclusions. The results obtained have made it possible to propose a correction factor to the results of the calculation of frames with imperfections to the results of the calculation of an idealized frame.

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Sharping, Jay E., Jacob Pate, Jacob Parker, Johnathon J. Thompson, Luis A. Martinez, Alessandro R. Castelli et Raymond Y. Chiao. « Joints and shape imperfections in high-Q 3D SRF cavities for RF optomechanics ». Journal of Applied Physics 128, n^o 7 (21 août 2020) : 073906. http://dx.doi.org/10.1063/5.0007451.

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Toral-Lopez, Alejandro, Enrique G. Marin, Francisco Pasadas, Jose Maria Gonzalez-Medina, Francisco G. Ruiz, David Jiménez et Andres Godoy. « GFET Asymmetric Transfer Response Analysis through Access Region Resistances ». Nanomaterials 9, n^o 7 (18 juillet 2019) : 1027. http://dx.doi.org/10.3390/nano9071027.

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Graphene-based devices are planned to augment the functionality of Si and III-V based technology in radio-frequency (RF) electronics. The expectations in designing graphene field-effect transistors (GFETs) with enhanced RF performance have attracted significant experimental efforts, mainly concentrated on achieving high mobility samples. However, little attention has been paid, so far, to the role of the access regions in these devices. Here, we analyse in detail, via numerical simulations, how the GFET transfer response is severely impacted by these regions, showing that they play a significant role in the asymmetric saturated behaviour commonly observed in GFETs. We also investigate how the modulation of the access region conductivity (i.e., by the influence of a back gate) and the presence of imperfections in the graphene layer (e.g., charge puddles) affects the transfer response. The analysis is extended to assess the application of GFETs for RF applications, by evaluating their cut-off frequency.

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Jaitawat, Arpita, et Arun Kumar Singh. « Battery and supercapacitor imperfections modeling and comparison for RF energy harvesting wireless sensor network ». Wireless Networks 26, n^o 2 (6 septembre 2018) : 843–53. http://dx.doi.org/10.1007/s11276-018-1831-z.

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Thèses sur le sujet "Imperfections RF"

Koskela, H. (Harri). « Some aspects of polarisation transfer in NMR spectroscopy ». Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514277988.

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Abstract Modern NMR methods in liquids are based on the transfer of polarisation from nucleus to nucleus to generate multidimensional heteronuclear correlation spectra. The factors that influence the efficiency of heteronuclear polarisation transfer in multi-pulse experiments, and in that way the quality of spectra are the subject of this thesis. The flow of coherence through pulse sequences can be designed and analysed with the aid of product operator calculations. Results of the study include improvements to quantitative two-dimensional shift-correlated experiments, and demonstration of the benefits of closely spaced 180° pulse trains in polarisation transfer steps in long-range correlation experiments and isotope editing filters.

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Nasser, Youssef. « Sensibilité des systèmes OFDM-CDMA aux erreurs de synchronisation en réception radio-mobile ». Phd thesis, Grenoble INPG, 2006. http://tel.archives-ouvertes.fr/tel-00214147.

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Dans le cadre des systèmes de communications radio mobiles de la 4ème génération, on s'est intéressé aux systèmes combinant les techniques d'étalement par les codes et de transmission à porteuses multiples.
La thèse consiste à étudier en premier lieu les performances des différents types de combinaisons de l'OFDM et du CDMA, appelées sous le nom générique « OFDM-CDMA », dans un environnement parfaitement synchronisé dans une liaison descendante avec les mêmes conditions de transmission : charge du système, constellation, rendement du codage.
Une fois la comparaison des différents systèmes établie dans un contexte parfaitement synchronisé, on traitera le problème des imperfections de transmission : erreurs des synchronisation, imperfections Radio Fréquences (RF), estimation du canal, effet Doppler.
Les différents types d'erreurs de synchronisation étudiés dans le manuscrit sont la synchronisation de la fenêtre temporelle, la synchronisation des fréquences porteuse, et d'échantillonnage.
Les imperfections RF étudiées consistent en le bruit de phase et la gigue d'horloge.
Les sensibilités de l'OFDM-CDMA à ces erreurs sont évaluées en fonction du Rapport Signal à Interférence plus Bruit (RSIB) en sortie du détecteur en tenant compte de l'orthogonalité entre les codes d'étalement.
Finalement, on s'intéresse à évaluer les performances de ces systèmes en terme du Taux d'Erreur Binaire (TEB) en sortie du décodeur et à faire le lien entre le RSIB en sortie du détecteur et le TEB en sortie du décodeur.
En conclusion de ce travail, on peut tirer des limites tolérées sur les imperfections de transmission de ces systèmes ainsi qu'une comparaison entre leurs performances.

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Piják, Jiří. « Klopení nosníku - analýza specifických případů ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265731.

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Thesis deals with flexural-lateral buckling of asymmetric cross sections, especially assessment according to ČSN EN 1993-1-1. Models are based on bar, shell and solid finite element method. Assessment of software Scia Engineer and RFEM are analysed in bar model. Plate and volume model uses shell and solid elements and initial imperfections. Computing is geometrically nonlinear. Correspondence of bar and plate model is studied. Optimal amplitude is suggested. Simple beam loaded with continuous line loading is taken as an example.

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Lee, Chia-Fang, et 李佳芳. « Study of Wideband RF Imperfections Calibration Techniques and Experimental Verification ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ch98u7.

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碩士
元智大學
通訊工程學系
106
This thesis aims to study the wideband RF imperfection problems. The problems include the frequency independent I/Q imbalance, frequency dependent I/Q imbalance, and DC I/Q offset. We will explore the useful wideband impairment parameters estimation, compensation, and calibration procedures. For the estimation schemes, the following two schemes will be studied. One is the joint calibration of transmitter and receiver impairments. Another scheme is that to use the real I/Q channel model to represent both the I/Q compensator and the direct up/down-converter channel. Next, the compensation techniques will be the cascaded equalization algorithms to overcome the frequency independent, dependent I/Q imbalance, and DC I/Q offset. For the calibration procedures, the procedure is the receiver RF calibration being processed before the transmitter RF side, which will be realized by the I/Q received signal. For the main purpose, it is expected that the above methods can be employed for the calibration of ITRI wideband RF module and be implemented to transmit the wideband single-carrier and multi-carrier signals. The thesis designs the following steps for the RF calibration. First, to develop all digital software simulation platform, it can emulate the wideband RF imperfections and design the estimation and compensation technologies. Next, to employ the wideband RF module, e.g., AD9371 RF module, and the wideband instrument platform, e.g., NI PXIe-1075 5646R, generating the wideband RF impairments, it can integrate the previous software platform to verify the performance of the proposed calibration techniques. Finally, for the ITRI wideband RF module, the proposed calibration procedures can provide the reliable calibration performance and realize the wideband signal communication. To sum up, the above proposed design flows can combine the theory, simulation, instrument, RF module, and the practical measurements to overcome the wideband RF imperfections and to achieve the requirement of the wideband high equality communications.

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Chan, Yuan-Feng, et 詹元鳳. « Integrate the Instrument and MATLAB SDR platform to Implement the Estimation and Compensation of RF Imperfections ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/97633199392094310412.

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Livres sur le sujet "Imperfections RF"

Schenk, Tim. RF Imperfections in High-rate Wireless Systems. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1.

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RF imperfections in high-rate wireless systems : Impact and digital compensation. Dordrecht : Springer, 2008.

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Schenk, Tim. RF Imperfections in High-rate Wireless Systems. Springer, 2008.

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Schenk, Tim. RF Imperfections in High-Rate Wireless Systems : Impact and Digital Compensation. Springer, 2008.

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Schenk, Tim. RF Imperfections in High-Rate Wireless Systems : Impact and Digital Compensation. Springer Netherlands, 2010.

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Chapitres de livres sur le sujet "Imperfections RF"

« Introduction ». Dans RF Imperfections in High-rate Wireless Systems, 1–10. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_1.

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« Multiple-antenna OFDM systems ». Dans RF Imperfections in High-rate Wireless Systems, 11–29. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_2.

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« Design and implementation of a MIMO OFDM system ». Dans RF Imperfections in High-rate Wireless Systems, 31–82. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_3.

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« Phase Noise ». Dans RF Imperfections in High-rate Wireless Systems, 83–138. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_4.

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« IQ Imbalance ». Dans RF Imperfections in High-rate Wireless Systems, 139–83. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_5.

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« Nonlinearities ». Dans RF Imperfections in High-rate Wireless Systems, 185–243. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_6.

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« A generalised error model ». Dans RF Imperfections in High-rate Wireless Systems, 245–61. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_7.

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« Discussion and conclusions ». Dans RF Imperfections in High-rate Wireless Systems, 263–73. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6903-1_8.

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Shrivastav, Kamayani. « Phase Noise in OFDM ». Dans Multiplexing - Recent Advances and Novel Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105551.

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Orthogonal frequency division multiplexing (OFDM) technique provides high data rate with high spectral efficiency for operating close to the Shanon capacity bounds. With the advantages of simple channel equalization, robustness against frequency selectivity of the channel, and efficient implementation, this is a widely deployed technique. Orthogonal frequency division multiplexing access (OFDMA), the multiple access technique using OFDM, has the great potential for providing high spectral efficiency due to its integrated space-frequency and multiuser diversity. Besides all the advantages, OFDM/A is very susceptible to transceiver’s impairments such as phase noise (PHN), carrier frequency offset, and in-quadrature phase imbalance effect. Phase noise is the random fluctuation in phase of the sinusoidal waveform used for frequency up/down conversion of baseband signals to/from RF (radio frequency). This occurs due to the inherent imperfections of oscillators used for this purpose. This chapter addresses the orthogonal frequency division multiplexing/multiple access system performance under the impact of transceiver oscillator phase noise.

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Duncan, Diane, Suneel Chilukuri, David Kent, Klaus Hoffmann et Lim Tingsong. « Non-invasive Alternatives for Liposuction ». Dans Enhanced Liposuction - New Perspectives and Techniques [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101396.

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Body dissatisfaction due to an increased amount of subcutaneous fat, muscle laxity and/or skin imperfection poses a great concern for today’s society. Invasive surgical procedures intended for an immediate improvement of body contour such as liposuction were perceived as a means of restoring the optimum body shape. However, the invasive nature of liposuction plus a certain amount of discomfort and downtime leads to increasing popularity in the noninvasive esthetic procedures. This chapter aims to emphasize the use of latest noninvasive technologies as a viable alternative to the liposuction. Three patient cases with different levels of treatment outcomes were reviewed. Patients received treatments either with high-intensity focused electromagnetic field (HIFEM) procedure or a combination of HIFEM and synchronized radiofrequency (RF), optionally followed by the simultaneous therapy by targeted pressure energy (TPE) plus monopolar RF. HIFEM alone resolves muscle laxity, reduces the separation of abdominal muscles and reduces abdominal adipose tissue. When combined with synchronized RF, the effect on muscle and fat tissue is enhanced. Concomitant use of monopolar RF and TPE shows considerable improvements in skin quality, including diminished skin laxity or cellulite. The use of HIFEM, RF and TPE technologies can be a good noninvasive liposuction alternative.

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Actes de conférences sur le sujet "Imperfections RF"

Polak, Adam C., et Dennis L. Goeckel. « Wireless device identification based on RF oscillator imperfections ». Dans ICASSP 2014 - 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2014. http://dx.doi.org/10.1109/icassp.2014.6854086.

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Tandur, Deepaknath, et Marc Moonen. « Digital Compensation of RF Imperfections for Broadband Wireless Systems ». Dans 2007 14th IEEE Symposium on Communications and Vehicular Technology in the Benelux. IEEE, 2007. http://dx.doi.org/10.1109/scvt.2007.4436235.

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Hangming Cao, Hangming Cao, Dong Wei Dong Wei, Rong Qiao Rong Qiao, Pengbo Si Pengbo Si et Lifang Wu Lifang Wu. « RF imperfections compensation for wavelet-based multi-band spectrum sensing ». Dans IET International Radar Conference 2015. Institution of Engineering and Technology, 2015. http://dx.doi.org/10.1049/cp.2015.1295.

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Mohr, Bastian, Ye Zhang, Jan Henning Mueller et Stefan Heinen. « Compensating imperfections in RF-DAC based transmitters using LUT-based predistortion ». Dans 2014 27th IEEE International System-on-Chip Conference (SOCC). IEEE, 2014. http://dx.doi.org/10.1109/socc.2014.6948946.

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Gokceoglu, Ahmet, Sener Dikmese, Mikko Valkama et Markku Renfors. « Enhanced energy detection for multi-band spectrum sensing under RF imperfections ». Dans 2013 International Conference on Cognitive Radio Oriented Wireless Networks (Crowncom). IEEE, 2013. http://dx.doi.org/10.1109/crowncom.2013.6636794.

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gokceoglu, ahmet, Sener Dikmese, Mikko Valkama et Markku Renfors. « Enhanced Energy Detection for Multi-band Spectrum Sensing under RF Imperfections ». Dans 8th International Conference on Cognitive Radio Oriented Wireless Networks. ICST, 2013. http://dx.doi.org/10.4108/icst.crowncom.2013.252015.

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Hakkarainen, Aki, Janis Werner et Mikko Valkama. « RF imperfections in antenna arrays : Response analysis and widely-linear digital beamforming ». Dans 2013 IEEE Radio and Wireless Symposium (RWS). IEEE, 2013. http://dx.doi.org/10.1109/rws.2013.6486683.

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Gotthans, Tomas, Roman Marsalek, Jakub Gotthans et Genevieve Baudoin. « Influence of Filter-Bank RF transceiver chain imperfections on digital predistortion performance ». Dans 2016 International Symposium on Wireless Communication Systems (ISWCS). IEEE, 2016. http://dx.doi.org/10.1109/iswcs.2016.7600979.

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Srinivasan, Sudharsan, Sener Dikmese et Markku Renfors. « Effects of RF Imperfections on Interference Rejection Combining Based Black-Space Cognitive Radio ». Dans 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring). IEEE, 2021. http://dx.doi.org/10.1109/vtc2021-spring51267.2021.9448895.

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Avci, Muslum Emir, et Sule Ozev. « Design Optimization for N-port RF Network Reflectometers under Noise and Gain Imperfections ». Dans 2020 IEEE International Test Conference (ITC). IEEE, 2020. http://dx.doi.org/10.1109/itc44778.2020.9325256.

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