Filters








691 Hits in 4.8 sec

Nonlinear Modeling and Analysis on Concurrent Amplification of Dual-Band Gaussian Signals

Ikuma ANDO, GiaKhanh TRAN, Kiyomichi ARAKI, Takayuki YAMADA, Takana KAHO, Yo YAMAGUCHI, Kazuhiro UEHARA
2013 IEICE transactions on electronics  
We devise a novel method for modeling the PA amplifying dual-band signals.  ...  This increases nonlinear distortion in its wideband power amplifier (PA) because the PA needs to concurrently amplify multi-band signals.  ...  Using the validated model, we then perform a theoretical analysis and simulation that show the nonlinear effect on concurrent amplification of OFDM signals.  ... 
doi:10.1587/transele.e96.c.1254 fatcat:bj66lhhf35e7pjytyuncpqnqke

Nonlinear-Stability Analysis of Higher Order $\Delta$ –$\Sigma$ Modulators for DC and Sinusoidal Inputs

J. Lota, M. Al-Janabi, I. Kale
2008 IEEE Transactions on Instrumentation and Measurement  
The present work that exists on predicting the stability of ∆-Σ modulators is confined to DC input signals and unity quantizer gains. This poses a limitation for numerous ∆-Σ modulator applications.  ...  The proposed research work gives the stability curves for DC, sine, and dual sinusoidal inputs for any value of the quantizer gain.  ...  In this paper, the stability analysis based on the noise-amplification curve is accomplished using the DF method for DC single-and dual-tone sinusoidal inputs for nonunity quantizer-gain values.  ... 
doi:10.1109/tim.2007.911640 fatcat:4eehjlsj4bgsbk5xm37ieh7dli

RF-PA Modeling of PAPR: A Precomputed Approach to Reinforce Spectral Efficiency

Jose Alejandro Galaviz-Aguilar, Cesar Vargas-Rosales, Esteban Tlelo-Cuautle
2020 IEEE Access  
A nonlinear PA modeling using cubic-spline basis is used to describe the amplification curve, and also to proceed to carry out spectral analysis of the signal and show that the models are in close agreement  ...  the polynomial basis function of the m-th branch for the dual-band PA model.  ...  His research interests include analog signal processing, design of integrated circuits, multi-objective optimization, chaotic oscillators, symbolic analysis and analog/RF and mixed-signal design automation  ... 
doi:10.1109/access.2020.3012610 fatcat:qmnyiausbffylhx75wvakknqcu

Subsampling Receivers with Applications to Software Defined Radio Systems [chapter]

Jos R. Garca Oya, Andrew Kwan, Fernando Muoz, Fadhel M., Mohamed Helaoui, Fernando Mrquez, Enrique Lpez-Morillo, Antonio Torralba
2012 Data Acquisition Applications  
case) are subsampled and may overlap with the signal of interest.  ...  In both nonlinear and multi-band cases, the data acquisition involved in the subsampling receiver has additional limitations, because the harmonics (nonlinear case) and other carrier frequencies (multi-band  ...  The authors also acknowledge Alberta Innovates -Technology Futures (AITF), the Natural Sciences and Engineering Research Council of Canada (NSERC), and the Canada Research Chairs (CRC) Program for their  ... 
doi:10.5772/49959 fatcat:gmxg57aienc4fcosz24niaujfa

Low complexity predistortion and equalization in nonlinear multicarrier satellite communications

Efrain Zenteno, Roberto Piazza, Bhavani Shankar Mysore Rama Rao, Daniel Rönnow, Björn Ottersten
2015 EURASIP Journal on Advances in Signal Processing  
In this scenario, a careful investigation of the resulting power efficiency is essential as amplification is nonlinear, and multicarrier signals exhibit enlarged peak-to-average power ratio.  ...  Clearly, in such payloads, the signal processing carried out on the ground can be updated based on technological advances in the course of the lifetime of the satellite.  ...  Multicarrier (MIMO) signal DPD has been studied in terrestrial applications for multiple channel transmitters [22, 23] and concurrent dual band amplifiers [24] .  ... 
doi:10.1186/s13634-015-0215-0 fatcat:gaqkpg6e3vamzfv7wfghivaxqq

Speech Enhancement Algorithm Based on Super-Gaussian Modeling and Orthogonal Polynomials

Basheera M Mahmmod, Abd Rahman Ramli, Thar Baker, Feras Al-Obeidat, Sadiq H Abdulhussain, Wissam A Jassim
2019 IEEE Access  
Third, two stages of nonlinear and linear estimators based on the minimum mean square error (MMSE) and new models for speech and noise are derived to estimate a clean speech signal.  ...  In most speech enhancement algorithms, the speech signal is characterized by Gaussian or super-Gaussian models, and noise is characterized by a Gaussian prior.  ...  Meanwhile, the nonlinear MMSE estimator (NBSE) is based on the statistical analysis notion, which requires knowledge regarding speech and noise probability distributions [3] .  ... 
doi:10.1109/access.2019.2929864 fatcat:xy4ofbk45zgm5oybsemf2qyfm4

Reduction of Radiometric Miscalibration—Applications to Pushbroom Sensors

Christian Rogaß, Daniel Spengler, Mathias Bochow, Karl Segl, Angela Lausch, Daniel Doktor, Sigrid Roessner, Robert Behling, Hans-Ulrich Wetzel, Hermann Kaufmann
2011 Sensors  
To objectively evaluate the performance of the new approach, the technique was applied to a variety of commonly used image examples and to one simulated and miscalibrated EnMAP (Environmental Mapping and  ...  The analysis of hyperspectral images is an important task in Remote Sensing.  ...  Acknowledgements This work was supported by the MoLaWa project funded by the German Federal Ministry of Economics and Technology (BMWi) in the framework of the program Zentrales Innovationsprogramm Mittelstand  ... 
doi:10.3390/s110606370 pmid:22163960 pmcid:PMC3231449 fatcat:xkqw63kcs5dwngr4hrnutcdiam

Analysis of Noncoherent ASK Modulation-Based RF-Interconnect for Memory Interface

Yanghyo Kim, Sai-Wang Tam, Gyung-Su Byun, Hao Wu, Lan Nan, Glenn Reinman, Jason Cong, Mau-Chung Frank Chang
2012 IEEE Journal on Emerging and Selected Topics in Circuits and Systems  
Both analysis and tested results prove that the performance of the proposed dual-band (RF+baseband) interconnect system is not limited by thermal noise interference.  ...  Index Terms-Dual-band signaling, inductive coupling, memory interface, noncoherent amplitude shift keying modulation, RF-interconnect, simultaneous bidirectional communication.  ...  His research interests include synthesis of VLSI circuits and systems, programmable systems, novel computer architectures, nano-systems, and highly scalable algorithms.  ... 
doi:10.1109/jetcas.2012.2193511 fatcat:wna6egwupfduva3znivup6loji

Iterative learning cascaded multiclass kernel based support vector machine for neural spike data classification

Amir Zjajo, Rene van Leuken
2015 2015 IEEE Conference on Computational Intelligence in Bioinformatics and Computational Biology (CIBCB)  
In this paper, we develop an iterative learning framework based on multiclass kernel support vector machine (SVM) for adaptive classification of neural spikes.  ...  We construct cascades of such (partial) approximations and use them to obtain the modified objective function, which offers high accuracy, has small kernel matrices and low computational complexity.  ...  This research was supported in part by the European Union and the Dutch government as part of the CATRENE program under Heterogeneous INCEPTION project.  ... 
doi:10.1109/cibcb.2015.7300278 dblp:conf/cibcb/ZjajoL15 fatcat:s5zd4wtwarciph6gr2f33xh7da

2020 Index IEEE Transactions on Circuits and Systems II: Express Briefs Vol. 67

2020 IEEE Transactions on Circuits and Systems - II - Express Briefs  
Sait, H., Design of a Single Chip PWM Driver Circuit for Inverter Welding Power Source; TCSII April 2020 720-724 Jacobsson, S., see Castaneda, O., TCSII May 2020 891-895 Jafari, E., and Binazadeh, T  ...  Y., and Mak, T., A Fast-Transient Response Digital Low-Dropout Regulator With Dual-Modes Tuning Technique; 2943-2947 Qian, X., see Yi, X., TCSII Nov. 2020 2402-2406 Qiao, S., see You, H., TCSII Dec.  ...  ., +, TCSII April 2020 670-674 Fourier analysis Fourier Analysis of Signal Waveforms in An Ideal Concurrent Dual-Band Class-D Power Amplifier.  ... 
doi:10.1109/tcsii.2020.3047305 fatcat:ifjzekeyczfrbp5b7wrzandm7e

Poly-harmonic Analysis of Raman and Mandelstam-Brillouin Scatterings and Bragg Reflection Spectra [chapter]

Oleg G. Morozov, Gennady A. Morozov, Ilnur I. Nureev, Anvar A. Talipov
2015 Advances in Optical Fiber Technology: Fundamental Optical Phenomena and Applications  
The chapter is devoted to applications and construction principles of poly-harmonic (twofrequency or four-frequency) cw laser systems for characterization of different nonlinear scattering effects in fibers  ...  and reflection of devices based on fiber Bragg gratings (FBG) in telecommunication lines and sensor nets.  ...  Model analysis of the Raman spectrum with Gaussian profiles is based on the following expression [21] : ( ) ( ) 2 2 , 1 exp / , m N R R i v i i i g v g A v v = é ù = -- G ë û å ( 8 ) where N m is the  ... 
doi:10.5772/59144 fatcat:pfxgupxkpvbn5dxe7oaep76in4

A Crest Factor Reduction Technique for LTE Signals with Target Relaxation in Power Amplifier Linearization

José Ricardo Cárdenas-Valdez, Jose Alejandro Galaviz-Aguilar, Cesar Vargas-Rosales, Everardo Inzunza-González, Leonardo Flores-Hernández
2022 Sensors  
A developed framework is built to provide a demonstration of the modeling figures of merit with orthogonal frequency division multiplexing (OFDM) support under signal conditioning and transmission restrictions  ...  The signal conditioning treatment to achieve good relation of power with radio-frequency (RF) conversion in conventional transceiver systems require precise baseband models.  ...  Additionally to UABC and TECNM/Tijuana Institute of Technology, for the support provided for the development of this research.  ... 
doi:10.3390/s22031176 pmid:35161921 pmcid:PMC8840697 fatcat:hjdhhnjzavhhpoy2srkxzwczkm

Differential Phase-Shift Keying for High Spectral Efficiency Optical Transmissions

C. Xu, X. Liu, X. Wei
2004 IEEE Journal of Selected Topics in Quantum Electronics  
The advantages of DPSK in terms of receiver sensitivity and tolerance to fiber nonlinearity will be discussed in detail.  ...  Results of experimental and numerical investigations of several phase shift keying formats, including polarization division multiplexing and multilevel encoding, will be reviewed.  ...  The BER as a function of signal-to-noise ratio for OOK can be calculated with essentially the same model based on matched optical filtering.  ... 
doi:10.1109/jstqe.2004.827835 fatcat:ar3naiyggrfdfir7tobkmmevke

A Survey on Techniques for Enhancing Speech

Tayseer M., Ahsan Adeel, Amir Hussain
2018 International Journal of Computer Applications  
This paper focuses on the techniques that appeared in the literature to enhance the signal of speech.  ...  Some of the interferences that may affect the speech quality of transit include acoustic additive noise, acoustic reverberation or white Gaussian noise.  ...  The author derived the MMSE STSA estimator, based on modeling noise and speech spectral components as statistically independent Gaussian random variables and analyzed the performance of the proposed STSA  ... 
doi:10.5120/ijca2018916290 fatcat:24ribi6izbat5ggndg7qdame24

Multi-core Fiber Technology [chapter]

Muhammad Irfan Anis, Hamdan Ali
2021 Fiber Optics - Technology and Applications  
This chapter describes the recent progress on the Multi-core fibers technology for the application of high capacity space-division multiplexing to be utilized for long-distance transmission systems.  ...  Traditional single-mode fiber capacity issues will be mitigated by using space-division multiplexing in future 5G, IoT, and M2M networks.  ...  Ps is the per-channel (dual-polarization) signal launch power, and PASE is the per-channel (dual-polarization) amplified spontaneous emission power.  ... 
doi:10.5772/intechopen.100116 fatcat:2kihonhspba45pyhnu66zgbula
« Previous Showing results 1 — 15 out of 691 results