Orthogonal Frequency Division Multiplexing
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Efficient Low-Complexity Optimized Channel Estimating Methods for OFDM-Based Low-Voltage Broadband Power Line Communication Systems
Abstract Broadband Power Line Communication (BB-PLC) technology enables data transmission for smart grid applications. Nevertheless, channel equalizers are required in the receiver to estimate and compensate for the nonlinear time-variant impulse response and noise interference effects introduced by the BB-PLC channel. In this paper, we append the Particle S
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. 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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3. Heuristics for the optimized deployment of small cells in next-generation networks
Abstract Heterogeneous Networks (HetNets) have been introduced as an alternative means of improving the overall network capacity. However, HetNets increase the complexity and cost of transport due to the large number of smallcells (SCs) that have to be connected, and hence, it is essential to investigate the best way to plan the joint deployment of radio and
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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4. A Compact Dual-Band Octagonal Slotted Printed Monopole Antenna for WLAN/ WiMAX and UWB Applications
AbstractA compact (20 x 20 mm2 size), coplanar waveguide (CPW) fed, octagonal slotted, dual-band antenna is presented in this paper. The proposed antenna has a simple structure consisting of an octagonal slot, L-shape stub, and a two stepped rectangular patch. The introduction of the L-shaped metallic stubs in the ground plane generates a lower resonance fre
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-06
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5. Estudos de sistemas OFDM para comunicações ópticas / Studies OFDM systems for optical communications
The development of digital modulation formats in optical communications systems is considered to be a promising way to increase the spectral efficiency and to combat the effects of signal degradation in optical fiber without changing the infrastructure already deployed. In this context, the technique called OFDM (orthogonal frequency division multiplexing) e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/10/2012
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6. Proposal of a new approach for BER evaluation of multirate, multiservice OCDMA systems / Proposta de uma nova abordagem para o cálculo da BER de sistemas OCDMA de múltiplas taxas e multiserviços
The continuous evolution of the optical communication technology in the last few years has allowed the growing users demand for higher bandwidth to be satisfactorily attended. This new demand is mainly attributed to the growing popularity of bandwidth-intensive networking applications, such as Internet protocol television (IPTV), high-definition television (
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2012
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7. Sincronismo de tempo e frequência em receptores OFDM
Este trabalho propõe uma nova implementação do sistema de sincronismo de tempo e frequência para receptores OFDM (Orthogonal Frequency Division Multiplexing). A técnica OFDM e utilizada no sistema de TV digital adotado no Brasil (ISDB-T), bem como na quase totalidade das tecnologias para wireless broadband atualmente no mercado (IEEE 802.16 WiMax, 3GPP-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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8. Algoritmo de Policiamento de Tráfego para Redes OFDM/TDMA WiMAX Baseado em Modelagem Multifractal e Cálculo de Rede / Network Traffic policing Algorithm to OFDM/ TDMA WiMAX Based in Multifractal Models and Network Calculus
A modelagem multifractal tem se mostrado mais apropriada para descrever algumas características encontradas nos fluxos de tráfego de redes reais que outros modelos, tais como o modelo de Poisson e Markov. Este trabalho investiga o comportamento dos algoritmos de policiamento baseados em modelagem de tráfego (Balde Furado, Balde Furado Fractal, Balde Furad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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9. Algoritmo de Policiamento de Tráfego para Redes OFDM/TDMA WiMAX Baseado em Modelagem Multifractal e Cálculo de Rede / Network Traffic policing Algorithm to OFDM/ TDMA WiMAX Based in Multifractal Models and Network Calculus
A modelagem multifractal tem se mostrado mais apropriada para descrever algumas características encontradas nos fluxos de tráfego de redes reais que outros modelos, tais como o modelo de Poisson e Markov. Este trabalho investiga o comportamento dos algoritmos de policiamento baseados em modelagem de tráfego (Balde Furado, Balde Furado Fractal, Balde Furad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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10. Implementação de processador banda base ofdma para downlink lte em fpga
This work treats of an implementation OFDMA baseband processor in hardware for LTE Downlink. The LTE or Long Term Evolution consist the last stage of development of the technology called 3G (Mobile System Third Generation) which offers an increasing in data rate and more efficiency and flexibility in transmission with application of advanced antennas and mul
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
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11. Theoretical and experimental performance evaluation methods for DD-OFDM systems with optical amplification
Several methods have been proposed to evaluate theoretically and experimentally the performance of optically amplified direct-detection orthogonal frequency division multiplexing systems. In this paper, we review those methods, and highlight their main advantages and disadvantages.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
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12. Equalização em sistemas OFDM óptico
Na última década a técnica OFDM (Orthogonal Frequency Division Multiplex ) tem ganhado cada vez mais espaço nas comunicações com e sem fio. A área das comunicações ópticas também se desenvolveu bastante nos últimos anos. Recentemente iniciou-se a junção destes dois recursos: a técnica OFDM e o canal óptico. Dentro deste panorama, este trabalh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2010