The frequencyand time-domain expressions are derived for the signal-to-noise power ratio (SNR) of an ideal Rake combiner output in a direct sequence spread spectrum (DSSS) mobile communication system. The derived SNR expressions make it possible to estimate the SNR statistics after Rake combining for an arbitrary spreading chip rate in the frequencyselective multipath channel. key words: spread...

It is becoming more widely acknowledged that in order to build appropriate decision support systems (DSSs) and models, stakeholder consultation is an important part of the model development process, promoting shared learning and final acceptance of the model. The degree to which stakeholders are engaged in the development of such models can vary from information sessions about the model that is...

En este trabajo se trataran las diferencias entre los sistemas FHSS y DSSS spread spectrum. Estos sistemas son la base en el desarrollo de las nuevas tecnologías inalámbricas. El canal de comunicación y las propiedades de ambos sistemas son importantes para determinar la elección de uno u otro en una particular aplicación. Primero, introduciremos ambos sistemas y posteriormente utilizaremos mod...

This paper presents a user-centered design methodology for Decision Support Systems (DSSs), which is specifically built to face the socio-technical gap that often impedes DSS acceptability by end users in real work environments. The methodology has been experimented in two case studies in the field of healthrelated emergencies, namely earthquake and pandemic flu management. Methodology applicat...

In this paper, a radio physical layer for a wireless fieldbus network is proposed. For this, a model is described and a performance evaluation is presented, by means of both measurements and analytical calculations of the Bit Error Rate (BER), using the Direct Sequence Spread Spectrum (DSSS) technology in static and dynamic modes, and of the timing of the basic message cycle, using Profibus as ...

We present a comprehensive set of measurements of a 2.4 GHz DSSS wireless LAN and analyze its behavior. We examine issues such as host and interface heterogeneity, bidirectional (TCP) traffic and error modeling, that have not been previously analyzed. We uncover multiple problems with TCP and UDP performance in this system. We investigate the causes of these problems (radio hardware, device dri...

This study aimed to develop an evaluation tool that assesses the use of AI-based decision support systems (DSSs) in professional practice from a human-centered perspective. Following International Organization for Standardization, this perspective aims ensure interactive technologies improves users' psychological load experience and behavior, e.g., form reduced stress or increased performance. ...

In this paper, a tensor-based approach to blind despreading of long-code multiuser DSSS signals is proposed. We aim generalize the methods originally developed for separation short-code cases. Firstly, we model intercepted with an antenna-array receiver as three-order tensor missing values, and then, problem can be formulated canonical or parallel factor (CANDECOMP/PARAFAC) decomposition missin...

This paper presents experimental evidence that orthogonally crossed dark soliton stripes form quasi-twodimensional spatial solitons with a soliton constant equal to that of singly charged optical vortices. Besides the pairs of oppositely charged optical vortex solitons, the snake instability of the dark formation at moderate saturation is found to lead to generation of steering mixed edge–screw...