A multitone model of complex enveloped signals and its application in feedforward circuit analysis

2005-06-01
Coskun, AH
Mutlu, Ayşe Ceyda
Demir, S
Analytical tools that characterize nonlinear systems are essential and need to be developed for initial rapid optimizations and understanding of the system performance. Modeling of the input signal is a crucial part of this task. In this paper, a multitone representation for an arbitrary double-side banded (symmetric spectrum around carrier frequency) stochastically not well-defined signal and its application to a feedforward circuit, which involve two nonlinear amplifiers, couplers, phase, and delay units are presented. Amplitude and phase aspects of the model are particularly highlighted and verified with RF simulations performed by real power-amplifier models and components.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES

Suggestions

Transformation Electromagnetics Based Analysis of Waveguides With Random Rough or Periodic Grooved Surfaces
Ozgun, Ozlem; Kuzuoğlu, Mustafa (Institute of Electrical and Electronics Engineers (IEEE), 2013-02-01)
A computational model is introduced which employs transformation-based media to increase the computational performance of finite methods (such as finite element or finite difference methods) for analyzing waveguides with grooves or rough surfaces. Random behavior of the roughness is taken into account by utilizing the Monte Carlo technique, which is based on a set of random rough surfaces generated from Gaussian distribution. The main objective of the proposed approach is to create a single mesh, and to ana...
A Hierarchical Partitioning Strategy for an Efficient Parallelization of the Multilevel Fast Multipole Algorithm
Ergül, Özgür Salih (Institute of Electrical and Electronics Engineers (IEEE), 2009-06-01)
We present a novel hierarchical partitioning strategy for the efficient parallelization of the multilevel fast multipole algorithm (MLFMA) on distributed-memory architectures to solve large-scale problems in electromagnetics. Unlike previous parallelization techniques, the tree structure of MLFMA is distributed among processors by partitioning both clusters and samples of fields at each level. Due to the improved load-balancing, the hierarchical strategy offers a higher parallelization efficiency than previ...
EFFICIENT SOLUTIONS OF METAMATERIAL PROBLEMS USING A LOW-FREQUENCY MULTILEVEL FAST MULTIPOLE ALGORITHM
Ergül, Özgür Salih (EMW Publishing, 2010-01-01)
We present fast and accurate sloutions of electromagnetics problems involving realistic metamaterial structures using a lowfrequency multilevel fast multipole algorithm (LF-MLFMA). Accelerating iterative solutions using robust preconditioning techniques may not be sufficient to reduce the overall processing time when the ordinary high-frequency MLFMA is applied to metamaterial problems. The major bottleneck, i.e., the low-frequency breakdown, should be eliminated for efficient sloutions. We show that the co...
Presentation of a multi-tone model and its application to feedforward circuit analysis
Coskun, Hakan; Mutlu, Ahmet; Demir, Şimşek (2004-12-01)
Analytical tools that characterize nonlinear systems are essential and need to be developed for initial rapid optimizations and understanding of the system performance. Modeling of the input signal is a crucial part of this task. In this work, we present a multi-tone representation for an arbitrary, stochastically not well-defined signal and its application to a feedforward circuit which involve two nonlinear amplifiers, couplers, phase and delay units. Particularly, amplitude and phase aspects of the model...
A mathematical characterization and analysis of a feedforward circuit for CDMA applications
Coskun, AH; Demir, S (Institute of Electrical and Electronics Engineers (IEEE), 2003-03-01)
Feedforward is known to be one of the best,methods for power amplifier linearization due to its superior linearization performance albeit with relatively poor power efficiency. Here we present the derived closed-form expressions, which relate the main channel power and distortion products at the output of a simple feedforward circuitry to the circuit parameters. Consequently, a mathematical handy tool is achieved toward specifying the circuit parameters rapidly for optimum linearity performance and efficien...
Citation Formats
A. Coskun, A. C. Mutlu, and S. Demir, “A multitone model of complex enveloped signals and its application in feedforward circuit analysis,” IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, pp. 2171–2178, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56931.