XXXIV Simpósio Brasileiro de Telecomunicações

The G.fast is the most recently DSL standard released by the ITU. The G.fast deployment environment is very noisy, in which several external interferences may impair the transmission. One of the most problematic interference source is the alien xtalk. Despite the difficult to mitigate this type of interference, there are some mitigation methods that...

One of the primary problems related to WDM Optical Networks is to find suitable routes with available wavelengths to attend to the call requests. This task is even more complex when the requests need to be protected to avoid injuries caused by failures. This paper proposes an adaptation of a well-known algorithm for routing with dedicated path...

In this work, the usual way to determine the rate-distortion curve for the binary case using hamming distortion is extended to the N-ary case with the same distortion. No new results are presented, but a very interesting case study to illustrate modern methodology to develop and, especially to teach information theory. It’s a nice motivation exercise to...

This paper presents the study of the performance of an all-optical device based on nonlinear directional couplers based on photonic crystal fiber dual-core. It analyzed the power transmission factor between the waveguides based on three main factors: input power, phase offset and length of the couplers. The numerical study used the Runge-Kutta fourth...

This paper presents an empirical-statistical model for the TTE propagation channel based on measurements performed in coal mines. The model uses normalized magnetic field data to characterize the behavior of the median propagation loss as a function of depth and frequency, as well as the equivalent conductivity and its probability distribution. It also...

Integer forcing is an alternative approach to conventional linear receivers in multiple-antenna systems. In the integerforcing scheme, the receivers try to extract integer combinations of messages from the received matrix before recovering each message individually. Recently, the integer-forcing approach was generalized to a block fading scenario....

We have analyzed the spatial modulation (SM) OFDM and V-BLAST OFDM systems equipped with particle swarm optimization (PSO)-based partial transmit sequence (PTS) PAPR reduction technique and not ideal side information (SI) transmission; while comparing such transmission schemes with the SM single-carrier (SC) and V-BLAST-SC systems. We observe that...

We consider the Block Diagonalization (BD) approach assuming multicell multiuser Multiple- Input Multiple-Output (MIMO) systems. For such systems, conventional BD (cBD) eliminates the intra-cell interference but neglects effects related to other cells, i.e., the Other-Cell Interference (OCI). Consequently, an enhanced BD (eBD) was proposed in the...

As redes de funções virtualizadas (NFV) tem sido bastante exploradas em serviços de armazenamento em nuvem. No entanto, a virtualização de serviço de distribuição de vídeo ainda requer amadurecimento da tecnologia, principalmente com relação aos mecanismos de gerenciamento e orquestração dos recursos virtualizados. Este trabalho traz um levantamento...

This work evaluates the effects of scaling the syndrome former memory, lifting factor and window size on the performance of spatially-coupled LDPC codes generated from protographs decoded using a sliding window. The results give a good insight on how these design parameters alter the trade-off between computational complexity and error-correcting capacity.