Academic literature on the topic 'RF impairments'

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Journal articles on the topic "RF impairments"

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Luo, Jian, Wilhelm Keusgen, and Andreas Kortke. "Efficient Joint Estimation and Compensation of CFO, Tx/Rx Frequency-Selective I/Q Imbalance, and the MIMO Radio Channel in OFDM Systems." Journal of Electrical and Computer Engineering 2013 (2013): 1–20. http://dx.doi.org/10.1155/2013/679032.

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MIMO OFDM is a very promising technique for future wireless communication systems. By applying direct conversion architecture, low-cost, low-power, small size, and flexible implementation of MIMO OFDM systems can be realized. However, the performance of direct conversion architecture-based MIMO OFDM systems can be seriously affected by RF impairments incling carrier frequency offset (CFO) and I/Q-imbalance. While OFDM is sensitive to CFO, direct conversion architecture is sensitive to I/Q imbalance. Such RF impairments aggravate as the carrier frequency becomes higher for example, beyond 60 GHz. To achieve the desired high performance of MIMO OFDM, such RF impairments have to be compensated for. In this paper, the joint compensation of CFO, transmitter and receiver frequency-selective I/Q imbalance, and the MIMO radio channel is investigated. Two preamble-based schemes are proposed for impairment parameter estimation. The proposed preambles are constructed both in time and frequency domains and require much less overhead than the state-of-the-art designs. Furthermore, much lower computational complexity is allowed, enabling efficient implementation. The advantages and effectiveness of both proposed schemes are compared and verified by numerical simulations and complexity analysis.
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Morge-Rollet, Louis, Frédéric Le Roy, Denis Le Jeune, Charles Canaff, and Roland Gautier. "RF eigenfingerprints, an Efficient RF Fingerprinting Method in IoT Context." Sensors 22, no. 11 (June 5, 2022): 4291. http://dx.doi.org/10.3390/s22114291.

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In IoT networks, authentication of nodes is primordial and RF fingerprinting is one of the candidates as a non-cryptographic method. RF fingerprinting is a physical-layer security method consisting of authenticated wireless devices using their components’ impairments. In this paper, we propose the RF eigenfingerprints method, inspired by face recognition works called eigenfaces. Our method automatically learns important features using singular value decomposition (SVD), selects important ones using Ljung–Box test, and performs authentication based on a statistical model. We also propose simulation, real-world experiment, and FPGA implementation to highlight the performance of the method. Particularly, we propose a novel RF fingerprinting impairments model for simulation. The end of the paper is dedicated to a discussion about good properties of RF fingerprinting in IoT context, giving our method as an example. Indeed, RF eigenfingerprint has interesting properties such as good scalability, low complexity, and high explainability, making it a good candidate for implementation in IoT context.
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Kiayani, Adnan, Lauri Anttila, Yaning Zou, and Mikko Valkama. "Advanced Receiver Design for Mitigating Multiple RF Impairments in OFDM Systems: Algorithms and RF Measurements." Journal of Electrical and Computer Engineering 2012 (2012): 1–16. http://dx.doi.org/10.1155/2012/730537.

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Direct-conversion architecture-based orthogonal frequency division multiplexing (OFDM) systems are troubled by impairments such as in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO). These impairments are unavoidable in any practical implementation and severely degrade the obtainable link performance. In this contribution, we study the joint impact of frequency-selective I/Q imbalance at both transmitter and receiver together with channel distortions and CFO error. Two estimation and compensation structures based on different pilot patterns are proposed for coping with such impairments. The first structure is based on preamble pilot pattern while the second one assumes a sparse pilot pattern. The proposed estimation/compensation structures are able to separate the individual impairments, which are then compensated in the reverse order of their appearance at the receiver. We present time-domain estimation and compensation algorithms for receiver I/Q imbalance and CFO and propose low-complexity algorithms for the compensation of channel distortions and transmitter IQ imbalance. The performance of the compensation algorithms is investigated with computer simulations as well as with practical radio frequency (RF) measurements. The performance results indicate that the proposed techniques provide close to the ideal performance both in simulations and measurements.
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Abushattal, Abdelrahman, Salah Eddine Zegrar, Ayhan Yazgan, and Hüseyin Arslan. "A Comprehensive Experimental Emulation for OTFS Waveform RF-Impairments." Sensors 23, no. 1 (December 21, 2022): 38. http://dx.doi.org/10.3390/s23010038.

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The orthogonal time-frequency space (OTFS) waveform exceeds the challenges that face orthogonal frequency division multiplexing (OFDM) in a high-mobility environment with high time-frequency dispersive channels. Since radio frequency (RF) impairments have a direct impact on waveform behavior, this paper investigates the experimental implementation of RF-impairments that affect OTFS waveform performance and compares them to the OFDM waveform as a benchmark. Firstly, the doubly-dispersive channel effect is analyzed, and then an experimental framework is established for investigating the impact of RF-impairments, including non-linearity, carrier frequency offset (CFO), I/Q imbalances, DC-offset, and phase noise are considered. The experiments were conducted in a real indoor wireless environment using software-defined radio (SDR) at carrier frequencies of 2.4 GHz and 5 GHz based on the Keysight EXG X-Series devices. The comparison of the performances of OFDM and OTFS in the presence of RF-impairments reveals that OTFS significantly outperforms OFDM.
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Ryu, Sang-Burm, Joong-Pyo Kim, Jeong-Hwan Yang, Young-Jin Won, and Sang-Kon Lee. "Study of RF Impairments in Wideband Chirp Signal Generator." Journal of Korean Institute of Electromagnetic Engineering and Science 24, no. 12 (December 31, 2013): 1205–14. http://dx.doi.org/10.5515/kjkiees.2013.24.12.1205.

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surekha, T. P. "C-Band VSAT Data Communication System and RF Impairments." International Journal of Distributed and Parallel systems 3, no. 3 (May 31, 2012): 339–55. http://dx.doi.org/10.5121/ijdps.2012.3328.

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Baudin, P., and F. Belveze. "Impact of RF Impairments on a DS-CDMA Receiver." IEEE Transactions on Communications 52, no. 1 (January 2004): 31–36. http://dx.doi.org/10.1109/tcomm.2003.822159.

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Sha, Ziyuan, and Zhaocheng Wang. "Channel Estimation and Equalization for Terahertz Receiver With RF Impairments." IEEE Journal on Selected Areas in Communications 39, no. 6 (June 2021): 1621–35. http://dx.doi.org/10.1109/jsac.2021.3071824.

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Boulogeorgos, Alexandros-Apostolos A., Paschalis C. Sofotasios, Bassant Selim, Sami Muhaidat, George K. Karagiannidis, and Mikko Valkama. "Effects of RF Impairments in Communications Over Cascaded Fading Channels." IEEE Transactions on Vehicular Technology 65, no. 11 (November 2016): 8878–94. http://dx.doi.org/10.1109/tvt.2016.2516901.

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Sharkasi, Youssif Fawzi, Des McLernon, and Mounir Ghogho. "Spectrum Sensing in the Presence of RF Impairments in Cognitive Radio." International Journal of Interdisciplinary Telecommunications and Networking 4, no. 3 (July 2012): 65–78. http://dx.doi.org/10.4018/jitn.2012070105.

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The spectrum detection performance of a matched filter (MF) in the presence of carrier frequency offset (CFO), phase noise (PN) and time offset is analyzed. Detection performance is derived theoretically and confirmed through simulation in the presence of CFO. The results have shown that in the presence of CFO, the MF may be outperformed by an energy detector (ED) over a range of CFO values. The authors propose three spectrum sensing techniques that are robust to CFO. The first technique is called the block-coherent detector (BLCD) with a suboptimal number of blocks (N/2). The second technique is called second-order matched filter-I (SOMF-I), the detection performance of which has been studied both theoretically and confirmed through simulation. The last technique is named the second-order matched filter-II (SOMF-II) and is a modified version of (SOMF-I) but with a superior performance. The presence of PN and time offset and their effect on the detection performance is then examined via simulation. The results have shown that PN has not affected the detection performance of SOMF-I and has only a slight effect on the MF performance. But the time offset has seriously degrades the MF, ED and SOMF-I. Also, the results have shown that the performance of SOMF-I is much less affected by noise uncertainty compared to the ED. Finally, the throughput of SOMF-I has been studied in the presence of CFO and the results have shown that its performance is only marginally degraded compared to the MF.
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Dissertations / Theses on the topic "RF impairments"

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Jnawali, Shashwat. "RF Impairments Estimation and Compensation in Multi-Antenna OFDM Systems." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1316467659.

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Dudek, Manuel [Verfasser]. "Towards Future Automotive Safety Applications based on Phased-Array FMCW-Radar Sensors - a Holistic Simulative Approach Incorporating RF-Frontend Impairments / Manuel Dudek." München : Verlag Dr. Hut, 2015. http://d-nb.info/1077403887/34.

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Tomlin, Toby-Daniel. "Analysis and modelling of jitter and phase noise in electronic systems : phase noise in RF amplifiers and jitter in timing recovery circuits." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0021.

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Timing jitter and phase noise are important design considerations in most electronic systems, particularly communication systems. The desire for faster transmission speeds and higher levels of integration, combined with lower signal levels and denser circuit boards has placed greater emphasis on managing problems related to phase noise, timing jitter, and timing distribution. This thesis reports original work on phase noise modelling in electronic systems. A new model is proposed which predicts the up-conversion of baseband noise to the carrier frequency in RF amplifiers. The new model is validated by comparing the predicted phase noise performance to experimental measurements as it applies to a common emitter (CE), bipolar junction transistor (BJT) amplifier. The results show that the proposed model correctly predicts the measured phase noise, including the shaping of the noise about the carrier frequency, and the dependence of phase noise on the amplifier parameters. In addition, new work relating to timing transfer in digital communication systems is presented. A new clock recovery algorithm is proposed for decoding timing information encoded using the synchronous residual time-stamp (SRTS) method. Again, theoretical analysis is verified by comparison with an experimental implementation. The results show that the new algorithm correctly recovers the source clock at the destination, and satisfies the jitter specification set out by the ITU-T for G.702 signals.
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Worsfold, Sarah. "Assessing expressive spoken language in children with permanent childhood hearing impairment in mid-childhood." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/376873/.

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Huang, Chia-Wei, and 黃嘉偉. "Digital Calibration for RF Impairments on Local Oscillator Phase-Shifting Array Radars." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/31589805198152703240.

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碩士
國立臺灣大學
電信工程學研究所
101
Arrays have been widely used in many aspects, such as radar, radio astronomy,sonar, communication, medical, seismology, and etc. There are also many different kinds of radar architectures in each field. Although the accuracy of the operation is required in almost all kinds of usage of array radars, some unavoidable mismatch would still exist due to the fabrication process variations. For example, amplitude errors,phase errors, and I/Q imbalance would cause damage on beamform patterns and the usage of the array radars. In the literature, baseband phase-shifting (BBPS) arrays have been the mainly discussed and a large number of digital calibration schemes has been proposed for BBPS systems. In recent years, local oscillator phase shifting (LOPS) has becoming more and more popular. However, no digital calibration scheme has been developed for LOPS systems yet. In this thesis, the application of the radar system in the local oscillator phase shifting architecture is studied. All kinds of different RF impairments are taken into consideration, and the input-output relation is derived then. A digital calibration scheme which contains an estimation method and a compensation method is presented. A comparison table between related analog calibration schemes and the proposed method is provided and shows that the proposed method leads to significant improvement compared to the previous work.
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"Extraction of RF Transceiver System Parameters and Impairments through Detailed Analytical Modeling combined with a Genetic Algorithm Approach." Master's thesis, 2011. http://hdl.handle.net/2286/R.I.14264.

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abstract: ABSTRACT To meet stringent market demands, manufacturers must produce Radio Frequency (RF) transceivers that provide wireless communication between electronic components used in consumer products at extremely low cost. Semiconductor manufacturers are in a steady race to increase integration levels through advanced system-on-chip (SoC) technology. The testing costs of these devices tend to increase with higher integration levels. As the integration levels increase and the devices get faster, the need for high-calibre low cost test equipment become highly dominant. However testing the overall system becomes harder and more expensive. Traditionally, the transceiver system is tested in two steps utilizing high-calibre RF instrumentation and mixed-signal testers, with separate measurement setups for transmitter and receiver paths. Impairments in the RF front-end, such as the I/Q gain and phase imbalance and nonlinearity, severely affect the performance of the device. The transceiver needs to be characterized in terms of these impairments in order to guarantee good performance and specification requirements. The motivation factor for this thesis is to come up with a low cost and computationally simple extraction technique of these impairments. In the proposed extraction technique, the mapping between transmitter input signals and receiver output signals are used to extract the impairment and nonlinearity parameters. This is done with the help of detailed mathematical modeling of the transceiver. While the overall behavior is nonlinear, both linear and nonlinear models to be used under different test setups are developed. A two step extraction technique has been proposed in this work. The extraction of system parameters is performed by using the mathematical model developed along with a genetic algorithm implemented in MATLAB. The technique yields good extraction results with reasonable error. It uses simple mathematical operation which makes the extraction fast and computationally simple when compared to other existing techniques such as traditional two step dedicated approach, Nonlinear Solver (NLS) approach, etc. It employs frequency domain analysis of low frequency input and output signals, over cumbersome time domain computations. Thus a test method, including detailed behavioral modeling of the transceiver, appropriate test signal design along with a simple algorithm for extraction is presented.
Dissertation/Thesis
M.S. Electrical Engineering 2011
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PingMa and 馬平. "FPGA and GPU Design Explorations of Nonlinear Signal Processing for RF Impairment Mitigation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99436355949322709604.

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碩士
國立成功大學
電機工程學系碩博士班
101
In this paper, we propose a complete mathematical model for a wide-range-CFO joint CFO and IQ imbalance compensation algorithm. The wide range of CFO is divided into three parts. According to the value of CFO, we have the Low-CFO Least-Square algorithm, the Least-Square algorithm, and the Short Preamble High-CFO Least-Square algorithm. By utilizing short preamble, the estimable range of CFO can be enlarged four times than only using short preamble and providing accurate estimate. Considering the hardware behavior when simulating the algorithm in C language, we apply High-Level Synthesis (HLS) to implement the algorithm on FPGA. We also apply Compute Unified Device Architecture (CUDA), one of the Graphic Processing Units (GPU), to accelerate the computing speed. Results show that our algorithm provides highly accurate estimate under very large range of CFO. HLS provides fast simulation in design phase.
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Books on the topic "RF impairments"

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Smaini, Lydi. RF Analog Impairments Modeling for Communication Systems Simulation. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118438046.

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Smaini, Lydi. RF analog impairments modeling for communication systems simulation: Application to OFDM-based transceivers. Chichester, West Sussex: Wiley, 2012.

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RF analog impairments modeling for communication systems simulation: Application to OFDM-based transceivers. Chichester, West Sussex: Wiley, 2012.

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Huang, Xinping. Signal processing for RF circuit impairment mitigation. Boston: Artech House, 2014.

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Smaini, Lydi. RF Analog Impairments Modeling for Communication Systems Simulation. Wiley & Sons, Incorporated, John, 2012.

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Smaini, Lydi. RF Analog Impairments Modeling for Communication Systems Simulation: Application to OFDM-Based Transceivers. Wiley & Sons, Incorporated, John, 2012.

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Smaini, Lydi. RF Analog Impairments Modeling for Communication Systems Simulation: Application to OFDM-Based Transceivers. Wiley & Sons, Incorporated, John, 2012.

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Smaini, Lydi. RF Analog Impairments Modeling for Communication Systems Simulation: Application to OFDM-Based Transceivers. Wiley & Sons, Incorporated, John, 2012.

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Smaini, Lydi. RF Analog Impairments Modeling for Communication Systems Simulation: Application to OFDM-Based Transceivers. Wiley & Sons, Limited, John, 2012.

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Schmidt, Christian, Gustavo González, Fernando Gregorio, and Juan Cousseau. Signal Processing Techniques for Power Efficient Wireless Communication Systems: Practical Approaches for RF Impairments Reduction. Springer, 2020.

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Book chapters on the topic "RF impairments"

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Mohammadi, Abbas, and Fadhel M. Ghannouchi. "RF Impairments in OFDM Transceivers." In RF Transceiver Design for MIMO Wireless Communications, 181–226. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27635-4_8.

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Mohammadi, Abbas, and Fadhel M. Ghannouchi. "RF Impairments in MIMO Transceivers." In RF Transceiver Design for MIMO Wireless Communications, 227–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27635-4_9.

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Dikmese, Sener, Kishor Lamichhane, and Markku Renfors. "Novel Filter Bank Based Cooperative Spectrum Sensing Under RF Impairments and Channel Fading Beyond 5G Cognitive Radios." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 45–58. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25748-4_4.

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Valkama, Mikko. "RF Impairment Compensation for Future Radio Systems." In Multi-Mode/Multi-Band RF Transceivers for Wireless Communications, 451–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470634455.ch15.

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"RF Impairments." In Wireless Transceiver Architecture, 417–93. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118874813.ch6.

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"RF Analog Impairments Description and Modeling." In RF Analog Impairments Modeling for Communication Systems Simulation, 37–105. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118438046.ch2.

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"Digital Compensation of RF Analog Impairments." In RF Analog Impairments Modeling for Communication Systems Simulation, 167–98. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118438046.ch4.

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Safatly, L., A. H. Ramadan, M. Al-Husseini, Y. Nasser, K. Y. Kabalan, and A. El-Hajj. "Tunable RF Front-Ends and Robust Sensing Algorithms for Cognitive Radio Receivers." In Advances in Wireless Technologies and Telecommunication, 68–99. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6571-2.ch003.

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In this chapter, the concepts of Cognitive Radio (CR) and multi-dimensional spectrum sensing are introduced. Spectrum sensing methodologies, energy efficiency consideration, resources scheduling, and self-management and learning mechanisms in cognitive radio networks are also discussed. The entailed challenges of CR RF front-end architectures are looked into. The synthesis and design performance analysis of a tunable RF front-end sensing receiver for CR applications are presented. The chapter also discusses how sensing performance degradation, which is due to RF impairments, is analytically evaluated. Spectrum sensing algorithms that correct imperfect RF issues by compensating induced error effects through digital baseband processing are also illustrated.
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"Introduction to Communication System-On-Chip, RF Analog Front-End, OFDM Modulation, and Performance Metrics." In RF Analog Impairments Modeling for Communication Systems Simulation, 1–35. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118438046.ch1.

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"Simulation of the RF Analog Impairments Impact on Real OFDM-Based Transceiver Performance." In RF Analog Impairments Modeling for Communication Systems Simulation, 107–65. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118438046.ch3.

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Conference papers on the topic "RF impairments"

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Lindoff, B., P. Malm, and O. Wintzell. "Impact of RF impairments on HSDPA performance." In 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577). IEEE, 2004. http://dx.doi.org/10.1109/icc.2004.1313149.

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Selim, Bassant, Paschalis C. Sofotasios, Sami Muhaidat, George K. Karagiannidis, and Bayan Sharif. "Performance of differential modulation under rf impairments." In ICC 2017 - 2017 IEEE International Conference on Communications. IEEE, 2017. http://dx.doi.org/10.1109/icc.2017.7997350.

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Studer, Christoph, Markus Wenk, and Andreas Burg. "MIMO transmission with residual transmit-RF impairments." In 2010 International ITG Workshop on Smart Antennas (WSA). IEEE, 2010. http://dx.doi.org/10.1109/wsa.2010.5456453.

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Ying Shen. "RF-related impairments for microwave digital radios." In 2005 European Microwave Conference. IEEE, 2005. http://dx.doi.org/10.1109/eumc.2005.1610189.

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Stuhlberger, Rainer, Linus Maurer, Gernot Hueber, and Andreas Springer. "HSDPA Performance Investigations related to RF-Impairments." In 2006 European Conference on Wireless Technologies. IEEE, 2006. http://dx.doi.org/10.1109/ecwt.2006.280477.

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Verlant-Chenet, Jonathan, Julien Renard, Jean-Michel Dricot, Philippe De Doncker, and Francois Horlin. "Sensitivity of Spectrum Sensing Techniques to RF Impairments." In 2010 IEEE 71st Vehicular Technology Conference. IEEE, 2010. http://dx.doi.org/10.1109/vetecs.2010.5493999.

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Tandur, Deepaknath, Chong-You Lee, and Marc Moonen. "Efficient Compensation of RF Impairments for OFDM Systems." In 2009 IEEE Wireless Communications and Networking Conference. IEEE, 2009. http://dx.doi.org/10.1109/wcnc.2009.4917698.

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Gregorio, Fernando, Juan Cousseau, Stefan Werner, Risto Wichman, and Taneli Riihonen. "Sequential Compensation of RF Impairments in OFDM Systems." In 2010 IEEE Wireless Communications & Networking Conference (WCNC 2010). IEEE, 2010. http://dx.doi.org/10.1109/wcnc.2010.5506425.

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Tandur, Deepaknath, and Marc Moonen. "Compensation of RF impairments in MIMO OFDM systems." In ICASSP 2008 - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing. IEEE, 2008. http://dx.doi.org/10.1109/icassp.2008.4518305.

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Marsalek, Roman, Martin Pospisil, Tomas Gotthans, and Tomas Urbanec. "60 GHz Setup for RF Components Impairments Compensation." In 2018 IEEE MTT-S International Microwave Workshop Series on 5G Hardware and System Technologies (IMWS-5G). IEEE, 2018. http://dx.doi.org/10.1109/imws-5g.2018.8484502.

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