System level simulation for femtocellular networks

© 2014 IEEE. LTE is an emerging wireless data communication technology to provide broadband ubiquitous Internet access. Femtocells are included in 3GPP since Release 8 to enhance the indoor network coverage and capacity. System level simulation is used for performance evaluation of LTE-Femtocellular networks. Research works on performance optimization could not be justified since there was no common reference simulator to do so until the inception of LTE-Sim. The simulation scenarios for Femtocells in LTE-Sim encompasses two-tier macro-femto scenario but to the best of our knowledge there is no published work on coding and scripting of femtocell scenario in LTE-Sim. In this paper, the development of a femtocell scenario is discussed with simulation outcomes

On the Implementation of AM/AM AM/PM Behavioral Models in System Level Simulation

The use of nonlinear device behavioral models offers an economical way of simulating the performance of complex communication systems. A concrete method for implementing the AM/AM AM/PM behavioral model in system level simulation using ADS is developed. This method seamlessly tansfers the data from the circuit level simulation to system level simulation, where the AM/AM AM/PM model is automatically built. The methodology is extendible for use in other software packages or between different software packages

Link and system level simulation of downlink LTE

3GPP LTE is the evolution of the UMTS which will make possible to deliver next generation high quality multimedia services according to the users’ expectations. Since Radio Resource Management (RRM) has been recognized as a key point to successfully accomplish this target, the performance evaluation of a multi-cell resource allocation scheme applied to LTE downlink (DL) is presented in this paper. A semi-distributed and a fully-distributed RRM framework are compared on the basis of the obtained system throughput. Detailed link level simulations have also been carried out to properly back up the system level results.Postprint (published version

DC/DC Converter Parametric Models for System level Simulation

The objective of this work is to propose a whole solution for simulating power systems based on the use of behavioral DC/DC converter models. The proposed model is a generic model whose parameters can be obtained from data sheets (especially useful to model commercial converters) or equivalent tests. The model has configurable features which can be activated or disabled in order to perform optimal simulations or to generate models with different levels of abstraction to be used in a top-down design methodology

An Interactive System Level Simulation Environment for Systems- on-Chip

International audienceThis article presents an interactive simulation environment for high level models intended for Design Space Exploration of Systems-On-Chip. The existing open source development environment TTool supports the MARTE compliant UML profile DIPLODOCUS and enables the designer to create, simulate and formally verify models. The goal is to obtain first performance estimations of the system intended for design while minimizing the modeling effort. The contribution outlined in this paper is an additional module providing means for controlling the simulation in real time by performing step wise execution, saving and restoring simulation states as well as animating UML models of the system. Moreover the paper elaborates on the integration of these new features into the existing framework consisting of a simulation engine on the one hand and a graphical user interface on the other hand

System Level Simulation of E-MBMS Transmissions in LTE-A

Interference coordination methods for EvolvedMultimedia Broadcast/Multicast Service (E-MBMS) in LongTerm Evolution Advanced (LTE-A) are presented. In this paper, OFDM/OFDMA signals based on LTE parameters are combined with Multipoint MIMO, Turbo codes and signal space diversity methods. Different interference coordination techniques, such as, Multipoint MIMO coordination, Fixed Relay stations, adaptive frequency reuse and schedulers are considered to evaluate the E-MBMS spectral efficiency at the cell borders. The system level coverage and throughput gains of Multipoint MIMO system with hierarchical constellations and Turbo-codes are simulated associated to the presence or not of fixed relays and measuring the maximum spectral efficiencies at cell borders of single cell point-to-multipoint or single frequency network topologies. The influence of the relay transmission power and cell radius in the performance of the previous cellular topologies is also evaluated

Accurate and simple modeling of amplifier dc gain nonlinearity in switched-capacitor circuits

This paper presents an accurate and simple model for dc gain nonlinearity of operational amplifiers used in the switched-capacitor circuits such as the sigma-delta modulators. The proposed model can simply be used in the time-domain system level simulation of sigma-delta modulators to evaluate the effect of amplifier's dc gain nonlinearity on the overall linearity of the modulator as well as in the other switched- capacitor circuits as explored in the paper.Comisión Interministerial de Ciencia y Tecnología TIC2003-0235