Journal ArticleDOI
Frequency-Independent and Frequency-Dependent Nonlinear Models of TWT Amplifiers
TLDR
A frequencydependent quadrature model is proposed whose parameters are obtainable from single-tone measurements and is shown to fit measured data very well.Abstract:
Simple two-parameter formulas are presented for the functions involved in the amplitude-phase and the quadrature nonlinear models of a TWT amplifier, and are shown to fit measured data very well. Also, a closed-form expression is derived for the output signal of a TWT amplifier excited by two phase-modulated carriers, and an expression containing a single integral is given when more than two such earriers are involved. Finally, a frequencydependent quadrature model is proposed whose parameters are obtainable from single-tone measurements.read more
Citations
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Journal ArticleDOI
Transmission techniques for digital terrestrial TV broadcasting
TL;DR: The authors discuss the potential of OFDM signaling, with its limitations and inherent problems, as well as another potential technique that has so far been overlooked: single-carrier transmission with frequency- domain equalization, and introduces coded-OFDM (COFDM), which makes use of channel coding and frequency-domain interleaving.
Journal ArticleDOI
Digital predistortion of wideband signals based on power amplifier model with memory
Jungsang Kim,K. Konstantinou +1 more
TL;DR: In this paper, memory effects in the power amplifier limit the performance of digital predistortion for wideband signals, and novel algorithms that take into account such effects are proposed to solve the problem.
Journal ArticleDOI
Millimeter Wave Communications for Future Mobile Networks
Ming Xiao,Shahid Mumtaz,Yongming Huang,Linglong Dai,Yonghui Li,Michail Matthaiou,George K. Karagiannidis,Emil Björnson,Kai Yang,Chih-Lin I,Amitabha Ghosh +10 more
TL;DR: A comprehensive survey of mmWave communications for future mobile networks (5G and beyond) is presented, including an overview of the solution for multiple access and backhauling, followed by the analysis of coverage and connectivity.
Book
Advanced Techniques in RF Power Amplifier Design
TL;DR: RF power amplifier modes Doherty and Chireix - themes and variations topics in PA non-linearity envelope feedback predistortion feedforward microwave-power amplifier design.
Journal ArticleDOI
Peak-To-Average Power Ratio Reduction in OFDM Systems: A Survey And Taxonomy
Yasir Rahmatallah,Seshadri Mohan +1 more
TL;DR: The survey describes the most commonly encountered impediment of OFDM systems, the PAPR problem and consequent impact on power amplifiers leading to nonlinear distortion, and provides insights into the transmitted power constraint by showing the possibility of satisfying the constraint without added complexity by the use of companding transforms with suitably chosen companding parameters.
References
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Journal ArticleDOI
Digital Amplitude-Phase Keying with M-Ary Alphabets
C. Thomas,M. Weidner,S. Durrani +2 more
TL;DR: Modem implementation methods, including carrier phase reconstruction techniques, are discussed for basic APK designs and the effects of AM-AM and AM-PM distortion on APK are presented as a function of power backoff for single-carrier operation.
Journal ArticleDOI
Analysis and Compensation of Bandpass Nonlinearities for Communications
A. Kaye,D. George,M. Eric +2 more
TL;DR: A heuristically optimal saturating nonlinearity is introduced and analyzed and two methods of compensating an arbitrary saturating device to obtain this optimal characteristic are presented.
Journal ArticleDOI
Effects of intermodulation, AM-PM conversion, and additive noise in multicarrier TWT systems
TL;DR: In this paper, the intermodulation due to the traveling-wave tube (TWT) is analyzed for the case where arbitrarily modulated carriers and Gaussian noise are amplified through the TWT.
Journal ArticleDOI
Characterization of Nonlinearities in Microwave Devices and Systems
TL;DR: In this article, a simple model to describe a nonlinear device or system is proposed which extends the power series expansion, conventionally restricted to amplitude nonlinearities, to include phase non-linearities as well.
Journal ArticleDOI
Nonlinear Phase Shift in Traveling-Wave Tubes as Applied to Multiple Access Communications Satellites
A. Berman,C. Mahle +1 more
TL;DR: In this article, the nonlinear phase versus input power behavior of traveling-wave tubes (TWT) and its impact on intermodulation noise and intelligible crosstalk is treated.