XXX Simpósio Brasileiro de Telecomunicações

Widely linear (WL) adaptive filters have been receiving much attention recently, since they take advantage of the full second-order statistics of improper signals. While this approach provides estimation gains if compared to their strictly linear (SL) counterparts,WL algorithms generally present higher computational complexity. In order to reduce...

The processing and transmission of digital video are impaired by degradations that impact its quality. Evaluation tools are then required to assess the quality of transmitted video. In this work we present a no-reference assessment metric based on an analytical method, which takes into account distinct weights for the spatial-temporal descriptors and...

Este trabalho aborda os aspectos de processamento estatístico de sinais e teoria da informação para supressão (cancelamento) de interferência em sistemas com múltiplas entradas e múltiplas saídas (MIMO, do inglˆes multiple input multiple output) e aspectos de modelagem considerando aspectos geométricos nos sistemas de recuperação da informação....

A necessidade da observação de regiões específicas do cérebro para a estimulação controlada, seja com fins medicinais ou de interação homem-máquina, vem despertando um crescente interesse em técnicas eficientes de detecção e estimação de parâmetros de sinais neuronais. Apesar de muitas soluções para realizar o spike sorting terem sido propostas,...

The Orthogonal Frequency Division Multiplexing (OFDM) scheme has been chosen as the transmission scheme for most digital television, digital radio and wireless standards. In this scheme the sub-carriers form a set of functions that are orthogonal to each other, that is, the integral of the product between any two of these functions within the...

Power line communication is a an established wired communication technology that has been investigated for low and high bit rate data communication systems. Currently, there is a great interests in providing new power line communication solutions for embedded systems, smart grid communication, and digital inclusion. Due to the impairments of...

Modulação codificada é uma ferramenta básica para simultaneamente melhorar o desempenho e aumentar a eficiência espectral de um sistema de transmissão digital. Nos últimos anos vários esquemas de modulação codificada foram propostos como candidatos a serem utilizados em sistemas de transmissão óptica que operam com eficiências espectrais altas....

Video communications have demanded higher computing power and, therefore, higher energy expenditure. To provide greener software-based video encoding solutions, we studied a method to optimize the prediction stage of H.264/AVC in the energy sense (E) and tested it with a software implementation. Besides looking for the coding options to the best...

Speech classification systems showed to be very interesting for many applications with security needs, such as access control, electronic bank transactions authentication, forensics and biomedical signal processing. Several studies and experiments confirmed that these systems achieve high recognition rates when considering clean or neutral speech...

The classical Erlang models are related to a situation in which a single operator supplies channels to a user population. Accordingly, they assume a monopolistic business model. In this work, we extend the Erlang-B model to a situation in which channels are supplied by two operators in a competitive business environment. The analysis is based on...