1,720,990 research outputs found
Efficient characterization of harmonic and intermodulation distortion effects in dispersive radio over fiber systems with direct laser modulation
No full textTheoretical and experimental Radio over Fiber (RoF) system performance was studied in the presence of fiber dispersion and of directly modulated DFB laser chirp. Measurements determined distortion terms of links with G-652 fibers. Agreement with computed values validates the model, used presently in RoF link design for wireless signal distribution
UN MODELLO EFFICIENTE PER LO STUDIO DI DISTORSIONE ARMONICA E DI INTERMODULAZIONE IN SISTEMI “RADIO OVER FIBER” CON LASER A MODULAZIONE DIRETTA
No full textAn efficient and conceptually simple numerical tool has been developed for Radio over Fiber (RoF) link performance evaluation. Successful comparisons have been made between modelled and measured quantities in RoF links intended for wireless signal distribution
DISTORSIONE ARMONICA E DI INTERMODULAZIONE IN SISTEMI “RADIO OVER FIBRE” CON LASER A MODULAZIONE DIRETTA
No full textThe performances of Radio over Fibre (RoF) systems in presence of fibre dispersion and spurious Frequency Modulation effects of directly modulated DFB lasers are studied and presented. Experimental results are successfully compared with theoretical ones
Laser predistortion for radio over fiber systems
No full textIn this paper, a design procedure to develop broadband predistortion circuits is proposed and described for radio over fiber systems application. The simultaneous compensation of both second- and third-order distortions have been performed
Analysis of the performance of LTE systems in an Interleaved F-DAS MIMO Indoor environment
No full textTransmission of UMTS and WIMAX Signals Over Cost-Effective Radio Over Fiber Systems
No full textA comprehensive theoretical and experimental investigation is presented on the performances of cost-effective radio over fiber (RoF) links where the RoF Transmitter is directly modulated by signals complying the Universal Mobile Telecommunications Service (UMTS) and Worldwide Interoperability for Microwave Access (WiMAX) standards. A numerical model for calculating intermodulation related quantities like the adjacent channel leakage ratio has been developed for this purpose. Measurements have also been performed over real RoF Systems modulated by UMTS and WiMAX signals. A very good agreement has been found between measured and modelled results, and the feasibility of these connections over distances of tens of kilometers has been investigated
Accurate and efficient transmission evaluation of wireless signals on radio over fiber links
No full textAn original and efficient time domain model simulating cost-effective IM-DD Radio over Fiber links carrying wideband signals is proposed and successfully applied in a comprehensive investigation on their feasibility over distances of tens of kilometres
Cost-effective radio over fiber system for multi service wireless signal
No full textThe feasibility of the simultaneous transmission of several wireless signals over a cost-effective Radio over Fiber (RoF) link is investigated. A RoF link simulation tool is presented and applied to validate the experimental results in the case of the transmission of two wireless signals, one compliant to Universal Mobile Telecommunications Service (UMTS) and one to Worldwide Interoperability for Microwave Access (WiMAX) standards. The cross-talk between the transmitted signals is showed and related to the RoF transmitter's characteristic in terms of frequency chirping. Both for uplink and downlink of the wireless signal RoF distribution system practical design aspects are finally evidenced
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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