3,956 research outputs found
Performance Analysis of PCFICH and PDCCH LTE Control Channels
Control channels play a key role in the evaluation of mobile system performance. The purpose of our paper is to evaluate the performance of the control channels implementation in the Long Term Evolution (LTE) system. The paper deals with the simulation of the complete signal processing chain for Physical Control Format Indicator Channel (PCFICH) and Physical Downlink Control Channel (PDCCH) in the LTE system, Release 8. We implemented a complete signal processing chain for downlink control channels as an extension of the existing MATLAB LTE downlink simulator. The paper presents results of PCFICH and PDCCH control channel computer performance analysis in various channel conditions. The results can be compared with the performance of data channels
An Integrated Development Environment for Declarative Multi-Paradigm Programming
In this paper we present CIDER (Curry Integrated Development EnviRonment), an
analysis and programming environment for the declarative multi-paradigm
language Curry. CIDER is a graphical environment to support the development of
Curry programs by providing integrated tools for the analysis and visualization
of programs. CIDER is completely implemented in Curry using libraries for GUI
programming (based on Tcl/Tk) and meta-programming. An important aspect of our
environment is the possible adaptation of the development environment to other
declarative source languages (e.g., Prolog or Haskell) and the extensibility
w.r.t. new analysis methods. To support the latter feature, the lazy evaluation
strategy of the underlying implementation language Curry becomes quite useful.Comment: In A. Kusalik (ed), proceedings of the Eleventh International
Workshop on Logic Programming Environments (WLPE'01), December 1, 2001,
Paphos, Cyprus. cs.PL/011104
Compiling ER Specifications into Declarative Programs
This paper proposes an environment to support high-level database programming
in a declarative programming language. In order to ensure safe database
updates, all access and update operations related to the database are generated
from high-level descriptions in the entity- relationship (ER) model. We propose
a representation of ER diagrams in the declarative language Curry so that they
can be constructed by various tools and then translated into this
representation. Furthermore, we have implemented a compiler from this
representation into a Curry program that provides access and update operations
based on a high-level API for database programming.Comment: Paper presented at the 17th Workshop on Logic-based Methods in
Programming Environments (WLPE2007
802.11 Wireless And Wireless Security
The purpose of this paper is to educate the wireless user or prospective wireless user regarding 802.11 wireless and wireless security. This is achieved by a review of the literature. Our review of the literature includes an overview of the most popular wireless standard, 802.11, some of the benefits of wireless networks, some of the vulnerabilities in wireless networks and some basic security recommendations specific to wireless networks. In addition, the paper gives an overview of some future wireless protocols that are currently being worked on by the various standard developing bodies.
Nucleation of austenite in mechanically stabilized martensite by localized heating
The nucleation of bcc austenite in a single crystal of a mechanically
stabilized 2H-martensite of Cu-Al-Ni shape-memory alloy is studied. The
nucleation process is induced by localized heating and observed by optical
microscopy. It is observed that nucleation occurs after a time delay and that
the nucleation points are always located at one of the corners of the sample (a
rectangular bar in the austenite), regardless of where the localized heating is
applied. Using a simplified nonlinear elasticity model, we propose an
explanation for the location of the nucleation points, by showing that the
martensite is a local minimizer of the energy with respect to localized
variations in the interior, on faces and edges of the sample, but not at some
corners, where a localized microstructure can lower the energy.Comment: Proceedings, ICOMAT 2011, Journal of Alloys and Compounds, in pres
- …