Amílcar C. César

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Two adaptive genetic algorithms (GAs), namely GA for locking channel (GALC) and GA for switching channel (GASC), are proposed for a dynamic channel assignment in mobile cellular communication systems. The algorithms aim to minimize the blocking probability of new calls and the dropping probability of handoff calls in channelized systems, simultaneously(More)
In this paper, we analyze the EDFA adaptive gain control impact on 80 modulated C-band channels (10 Gbps NRZ) in a DWDM optical system composed of four cascaded amplifiers. System performance was evaluated in terms of channels optical signal-to-noise ratio (OSNR), noise figure (NF), bit error rate (BER), and gain flatness (GF) measurements. The adaptive(More)
The dynamic channel assignment (DCA) in mobile communications systems using genetic algorithm (GA) is investigated in this research. Two new strategies using GA are proposed. In the first one, the channels previously assigned are kept locked during the call holding time (GAL). In the second one, the calls can be switched to different channels during the(More)
Our recently proposed cognitive methodology for optical amplifier gain adjustment, that relies on case-based reasoning, showed optical signal-to-noise ratio improvements over time demonstrating the cognition process regardless the deployed amplifier type. In this paper, we extend our preliminary analysis exploring the cognitive methodology benefits for(More)
This article presents an algorithm for dynamic-routing and wavelength assignment (D-RWA) in an optical WDM network. The approach is based on a genetic algorithm (GA) and it includes a connection admission control (CAC), to provide a network with simultaneous fairness in distance and bandwidth capacity. The algorithm is evaluated by means of computer(More)
Fernando L. Teixeira The Ohio State University Department of Electrical and Computer Engineering ElectroScience Laboratory 1320 Kinnear Road Abstract. The design of a new multifunctional integrated optical device capable of operating simultaneously as an optical switch and optical isolator is presented. The device consists of a multilayer directional(More)
We proposed a connection admission control (CAC) to monitor the traffic in a multi-rate WDM optical network. The CAC searches for the shortest path connecting source and destination nodes, assigns wavelengths with enough bandwidth to serve the requests, supervises the traffic in the most required nodes, and if needed activates a reserved wavelength to(More)
This paper shows a robust way to anticipate handover in a network composed by a GPON system operating as a backhaul of a WiFi network. We will show that this anticipation is necessary because, depending on the configuration, GPON needs some time to prepare its configuration to support the WiFi handover. In our method we use a combination of radio link and(More)
This paper analyses an optical network architecture composed by an arrangement of nodes equipped with multi-granular optical cross-connects (MG-OXCs) in addition to the usual optical cross-connects (OXCs). Then, selected network nodes can perform both waveband as well as traffic grooming operations and our goal is to assess the improvement on network(More)