Wireless Systems
Mostrando 13-24 de 166 artigos, teses e dissertações.
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13. Improved PLL-based MUSIC Algorithm for Single Receiver DF Systems
Abstract In this paper we propose an improved version of a single receiver DF system that combines a PLL scheme with the MUSIC algorithm to obtain both azimuthal and zenithal angles. The new approach uses a more efficient algorithm to remove the typical ambiguities of PLL-based schemes. We carry out several experiments to assess the algorithm performance. Am
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-12
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14. ANALYTICAL COMPARISON OF THE PERFORMANCE OF ADAPTIVE MODULATION AND CODING IN WIRELESS NETWORK UNDER RAYLEIGH FADING
Abstract In this paper, an analytic comparison between adaptive modulation (AdM) and adaptive Forward Error Correction (AdFEC) in wireless network telecommunication systems is performed. Through the Gilbert-Elliott model's, the Packet Error Rate (PER) is calculated and both the throughput and the delay, for different modulations and error correction capacity
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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15. A Low Complexity Iterative SLM-OFDM for SHF band applications
Abstract The transmitted Orthogonal Frequency Division Multiplexing signal in systems such as Wireless LAN, Mobile WiMAX, Digital Video Broadcasting (DVB) operating in the Super High Frequency (SHF) band suffers from high Peak to Average Power Ratio. This is reduced in Selective Level Mapping (SLM)approach but at the expense of increased complexity. In this
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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16. A Compact UWB Bandpass Filter using Hybrid Fractal Shaped DGS
Abstract In this paper, a novel and compact ultra wideband (UWB) bandpass filter (BPF) based on fractal-shaped defected ground structure (DGS) is designed and developed. It is made of stepped impedance lines and a composite right/left handed-transmission line (CRLH-TL) constructed with capacitive gap in conductor strip and a hybrid fractal-shaped ring slot i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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17. A Performance Evaluation of WLAN-Femtocell-LTE beyond the Capacity Crunch. Does Femtocell have to overcome WLAN or can they coexist in HetNets?
Abstract This paper originates from a practical experiment based on Mesh Networks. The promising results obtained from this experiment prompted us to discuss in greater depth whether Wireless Local Area Networks (WLAN) are still useful for current communications. This means that on the one hand femtocells can be defined as small base stations that use the sa
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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18. Artificial motor control for electrically stimulated upper limbs of plegic or paretic people
Introduction: Functional Electrical Stimulation (FES) is a technique used in the restoration and generation of movements performed by subjects with neuromuscular disorders such as spinal cord injury (SCI). The purpose of this article is to outline the state of the art and perspectives of the use of FES in artificial motor control of the upper limbs in pareti
Res. Biomed. Eng.. Publicado em: 14/06/2016
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19. ORGANIZATIONAL CONSEQUENCES OF THE ADOPTION OF MOBILE ERP SYSTEMS: CASE STUDIES IN BRAZIL
ABSTRACT The use of ERP systems via mobile/wireless devices is a subject rarely studied in academic research. The aim of this paper is to explore the following research question: what are the consequences of mobile ERP use for organizations? The research method adopted was the multiple case studies in three companies located in the South of Brazil. The resea
JISTEM J.Inf.Syst. Technol. Manag.. Publicado em: 2015-08
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20. Maximum Power Transfer versus Efficiency in Mid-Range Wireless Power Transfer Systems
AbstractThe condition for maximum power transfer of 2-coils wireless power transfer (WPT) system is derived from circuit analysis and discussed together with the respective WPT system efficiency (η). In the sequence, it is shown that a 4-coils WPT system (which can be divided in source, two communication and load circuits) without power losses at the two co
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-06
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21. Wi-Bio: management policy aimed at the establishment of networks for patient monitoring using IEEE 802.11
INTRODUCTION: Patient monitoring will tend to decline in the coming years due to a shortage of physical and human resources in hospitals. Therefore, several studies define alternatives to improve patient monitoring using wireless networks. In these studies, a wireless network is used to transfer data generated by medical sensors without interacting with the
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-06
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22. Wireless microsystems for biomedical applications
This paper presents a review with the state-of-the-art of wireless microsystems for biomedical applications. Aspects including the radio-frequency systems, data acquisition, application specificities (especially those in the context of implantable devices), power consumption and issues associated to their integration are presented. A review of COTS (Commerci
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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23. Architecture for ES Receiver Systems Targeted at Commercial Wireless Communications
ABSTRACT: Modern electronic support (ES) systems are descended from systems intended for the detection of small numbers of high-power radar systems, and are thus not suitable for the low-power transmitters and dense signal environments typical of commercial communication networks. A new ES-system architecture is proposed to allow the detection of large numbe
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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24. Desenvolvimento de ferramenta de comparação de técnicas de processamento de sinais para determinar fadiga muscular por meio do sinal emg / Toolkit development for signals processing technics comparison to detect muscular fadigue by EMG signal
This study aimed to development of a computational tool for electromyographic signal (EMG) analysis by signal processing techniques to determine muscular fatigue. With Ethics Committee of Federal University of Goiás approve were recorded from the dominant biceps brachii of 10 volunteers, that did not ever had muscular disease. The protocol consisted on get
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/07/2012