XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Closed-form expressions for energy detector performance parameters are derived using approximations of the central and non-central chi-square distributions. New equations are also presented that minimize the total error rate to obtain the optimal detection threshold. The approaches used have high closeness to the original functions. The analytical...

Na técnica de saltos em frequência adaptativa (adaptive frequency hopping, AFH) do padrão Bluetooth, canais sob interferência são excluídos do padrão de saltos, buscando evitar a queda na qualidade de serviço do sistema. Neste artigo apresenta-se uma prova de conceito de um módulo de sensoriamento espectral de baixo custo e baixa complexidade...

In elastic optical networks under dynamic traffic, the routing and spectrum allocation (RSA) are usually executed sequentially in two steps: by solving the routing firstly and then the spectrum assignment for this selected route or prioritizing some spectrum ranges and then searching for a route that meets such SA requirement. This paper proposes a...

The growth in the supply and use of wearable devices with embedded biomedical signal sensors, including electrodermal activity (EDA), requires and demands tools capable of representing and compressing them efficiently. The purpose includes measuring, storing and transmitting EDA signals from these devices, monitoring human body activity connectedly. In...

In 5G and next-generation communications systems, as well as at wireless transmission using millimeter waves, dual polarization systems have gained recent interest. This paper presents carrier frequency offset (CFO) synchronization technique for Dual-Polarized Orthogonal Frequency Division Multiplex (DP-OFDM) based on the transmission of training...

This work presents a modified version of an existing frame synchronization algorithm for DVB-S2 based satellite systems. The previous method uses pilot and header symbols to compute a decision metric, which is then fed to a peak search algorithm. The proposed method implements a more flexible decision metric and a peak search algorithm that allows for...

Audio-Frequency Shift Keying (AFSK) with continuous phase modulation and non-coherent demodulation is widely used on the telecommand channel of the most TT&C transceivers for CubeSat. However, this solution has low efficiency in terms of power. In this paper, a new all-digital AFSK modem is proposed. The demodulator uses the Viterbi algorithm to perform...

Neste trabalho é proposto um esquema de codificação espácio-temporal baseado em atratores caóticos tridimensionais. Codificadores de estados finitos são utilizados para mapear sequências de informação nos sinais caóticos que são transmitidos por múltiplas antenas. É proposta uma arquitetura de rede neural para decodificar o sinal transmitido por...

Recent research on QKD Protocols has focused on discrete modulation schemes for continuous-variable systems, which is a new paradigm in therms of security proof methodologies. Common security proof methodology consists on establishing an equivalent entangled based protocol, which requires the discrete modulated states purification. Here we show how one...

Kernel adaptive filters are used to solve nonlinear problems, such as the equalization and decoding of chaos-based communication systems (CBCS). This use was investigated in previous works. However, only with CBCS that use bidimensional maps as chaotic signal generators (CSG), which have higher computational cost. In this paper, it is proposed the...