Turbo Equalization Based on a Combined VMP-BP Algorithm for Nonlinear Satellite Channels

Close to saturation operation of high power amplifier (HPA) leads to strong nonlinear and dispersive characteristic of satellite channels. At the receiver, the observation signals are distorted by not only the linear inter-symbol interference (ISI), but also the nonlinear ones, which makes it challenge to perform optimal detection. In this paper, we study factor graph (FG)-based turbo equalization for nonlinear satellite channels characterized by Volterra series. Factor nodes on FG are classified into Belief propagation (BP) set and variational message passing (VMP) set to enable low complexity combined message passing implementation while with high performance. BP is used on the hard constraint nodes, such as demapping and decoding, while VMP is employed to update messages of the likelihood function node. It is shown that, without any approximation on the Volterra series channel model, messages can be expressed in a closed form via canonical parameters, and the extrinsic information from equalizer to decoder is derived in an explicit way. Simulation results demonstrate the superior performance of the proposed combined VMP-BP algorithm with low computational complexity

Intelligent Circuits and Systems

ICICS-2020 is the third conference initiated by the School of Electronics and Electrical Engineering at Lovely Professional University that explored recent innovations of researchers working for the development of smart and green technologies in the fields of Energy, Electronics, Communications, Computers, and Control. ICICS provides innovators to identify new opportunities for the social and economic benefits of society.　 This conference bridges the gap between academics and R&D institutions, social visionaries, and experts from all strata of society to present their ongoing research activities and foster research relations between them. It provides opportunities for the exchange of new ideas, applications, and experiences in the field of smart technologies and finding global partners for future collaboration. The ICICS-2020 was conducted in two broad categories, Intelligent Circuits & Intelligent Systems and Emerging Technologies in Electrical Engineering

Numerical Simulations

This book will interest researchers, scientists, engineers and graduate students in many disciplines, who make use of mathematical modeling and computer simulation. Although it represents only a small sample of the research activity on numerical simulations, the book will certainly serve as a valuable tool for researchers interested in getting involved in this multidisciplinary field. It will be useful to encourage further experimental and theoretical researches in the above mentioned areas of numerical simulation