Results 1 - 10 of 86,953

Wide Band-gap FETs for High Power Amplifiers

by Jinwook Burm, Jaekwon Kim
"... Abstract—Wide band-gap semiconductor electron devices have made great progresses to produce very high power amplifiers for various wireless standards. The advantages of wide band-gap electronic devices and their progresses are summarized in this paper. Index Terms—GaN, wide band-gap materials, FET, ..."
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Abstract—Wide band-gap semiconductor electron devices have made great progresses to produce very high power amplifiers for various wireless standards. The advantages of wide band-gap electronic devices and their progresses are summarized in this paper. Index Terms—GaN, wide band-gap materials, FET

Effect of High-power Amplifier on OFDM/TDM

by Haris Gacanin, Fumiyuki Adachi
"... Summary: Recently, to reduce a high peak-to-average power ratio (PAPR) of OFDM we proposed OFDM combined with time division multiplexing (OFDM/TDM). Using the frequency-domain equalization (FDE), improved BER performance is achieved. Since the OFDM/TDM cannot completely solve the PAPR problem, some ..."
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amount of input back-off (IBO) from the saturation point of high-power amplifier (HPA) may be required to reduce the signal distortion caused by the HPA nonlinearity. Moreover, if IBO is not carefuly chosen it may also affect the channel estimation (CE) required for FDE. In this paper, by computer

Behavioural High Power Amplifier Model For Accurate Adjacent Channel Power Simulation

by Mauri Honkanen, Sven-gustav Häggman , 1997
"... A semi-physical behavioural high power amplifier model to characterize nonlinear distortion in mobile communication systems was introduced in [1]. The functional model is able to copy the low-voltage features of a real amplifier causing crossover distortion. Hence it gives an improved description of ..."
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A semi-physical behavioural high power amplifier model to characterize nonlinear distortion in mobile communication systems was introduced in [1]. The functional model is able to copy the low-voltage features of a real amplifier causing crossover distortion. Hence it gives an improved description

Unconditionally Convergent pre-Distortion of non-Linear High Power Amplifiers

by Josep Sala, Hugo Durney, Power Amplifiers , 2001
"... The use of High Power Amplifiers (HPA) in digital communications is plagued with non-linear (AM/AM and AM/PM) distortion. This is specially acute for those modulations that are not constant amplitude, such as OFDM or MQAM. We present a pre-distortion algorithm that, in contrast to previously researc ..."
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The use of High Power Amplifiers (HPA) in digital communications is plagued with non-linear (AM/AM and AM/PM) distortion. This is specially acute for those modulations that are not constant amplitude, such as OFDM or MQAM. We present a pre-distortion algorithm that, in contrast to previously

An Efficient Predistorter Design for Compensating Nonlinear Memory High Power Amplifiers

by Sheng Chen
"... Abstract—This contribution applies digital predistorter to compensate distortions caused by memory high power amplifiers (HPAs) which exhibit true output saturation characteristics. Particle swarm optimization is first implemented to identify the Wiener HPA’s parameters. The estimated Wiener HPA mod ..."
Abstract - Cited by 3 (2 self) - Add to MetaCart
Abstract—This contribution applies digital predistorter to compensate distortions caused by memory high power amplifiers (HPAs) which exhibit true output saturation characteristics. Particle swarm optimization is first implemented to identify the Wiener HPA’s parameters. The estimated Wiener HPA

Dynamic Load Modulation of High Power Amplifiers with Varactor-Based Matching Networks

by Ali Soltani Tehrani, Hossein Mashad Nemati, Haiying Cao, Thomas Eriksson, Christian Fager
"... Abstract — In this paper, the results of dynamic load modu-lation on a high power amplifier is shown with experiments. A simple static nonlinear model is used as an inverse model, and by dynamically controlling both the input signal to the power amplifier and the load impedance, high efficiency oper ..."
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Abstract — In this paper, the results of dynamic load modu-lation on a high power amplifier is shown with experiments. A simple static nonlinear model is used as an inverse model, and by dynamically controlling both the input signal to the power amplifier and the load impedance, high efficiency

A LINEAR HIGH-VOLTAGE HIGH-POWER AMPLIFIER FOR USE WITH PIEZOELECTRIC ACTUATORS

by B. Yan, S. E. Prasad, R. Blacow, D. Waechter
"... Piezoelectric actuators are increasingly used in smart structures due to their reliability and performance characteristics. However these actuators present highly reactive impedances that make it difficult to design efficient drive amplifiers. This paper presents a high-voltage, high-power amplifier ..."
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Piezoelectric actuators are increasingly used in smart structures due to their reliability and performance characteristics. However these actuators present highly reactive impedances that make it difficult to design efficient drive amplifiers. This paper presents a high-voltage, high-power

An efficient technique for reducing PAPR of OFDM system in the presence of high power amplifier

by H. Y. Sakran, M. Shokair, A. A. Elazm - IEEE , 2008
"... Abstract—Peak to Average Power Ratio (PAPR) is one of the serious problems in any wireless communication system using multi carrier modulation technique like OFDM, which reduces the efficiency of the transmit high power amplifier. In this paper, proposed scheme will be introduced that combine interl ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
Abstract—Peak to Average Power Ratio (PAPR) is one of the serious problems in any wireless communication system using multi carrier modulation technique like OFDM, which reduces the efficiency of the transmit high power amplifier. In this paper, proposed scheme will be introduced that combine

Modelling of Narrowband High Power Amplifier in Radio Communication System Simulation

by Mauri Honkanen
"... A new behavioural amplifier model to characterise the AM/AM conversion of a solid-state high power amplifier in a mobile phone is introduced. The model is utilised in mobile communication system studies to investigate adjacent channel interference increase due to the spectral regrowth imposed by the ..."
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A new behavioural amplifier model to characterise the AM/AM conversion of a solid-state high power amplifier in a mobile phone is introduced. The model is utilised in mobile communication system studies to investigate adjacent channel interference increase due to the spectral regrowth imposed

A New Empirical Large-Signal Model of Si LDMOSFETs for High-Power Amplifier Design

by Jaehyok Yi, See Profile, Youngoo Yang, Student Member, Young Yun Woo, Jaehyok Yi, Bumman Kim, Senior Member , 2016
"... A new empirical large-signal model of Si LDMOSFETS for high-power amplifier design ..."
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A new empirical large-signal model of Si LDMOSFETS for high-power amplifier design
Results 1 - 10 of 86,953