XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

In this work, we analyze the effect of channel estimation errors on the bit error rate (BER) of a novel linear frequency domain iterative equalizer for SIMO single carrier systems with frequency domain equalization under the effect of multiple interferences, which takes the channel estimation errors into account in the equalization. It was found out that...

In this paper, a two-stage time domain technique is proposed to improve intelligibility of speech signals under noisy-reverberant conditions. In this method, the NNESE and ARAnsd methods are jointly taken into account to mitigate the effects of noise and reverberation separately. Additionally, the resulting approach is adaptive in the sense that no prior...

The remote monitoring of the elderly and patients with diseases that promote physical weakness are a relevant trend in healthcare. This work presents a smartphone based tool to assist these people, which is capable for detecting a fall of monitored patient and to alert the responsible, enabling an agile medical assistance. Moreover, we analyzed and...

This work presents three new methods for stimulation channel selection in cochlear implants. The proposed methods are based on random selection, following a probability density function that aims to prioritize high magnitude channels and to penalize spatio-temporal contiguity of activated channels. Comparisons using speech intelligibility objective...

In this work, a statistical characterization of the Fluctuating Two-Ray (FTR) fading channel model is performed in terms of the probability density function (PDF), and the performance of a point-to-point wireless communication system subject to this kind of fading is assessed in terms of the outage probability. The FTR model, recently proposed in the...

In this paper, we consider reconfigurable RF transceivers in cooperative communications towards improving the energy efficiency. More specifically, we combine different operating modes of the power amplifier (PA) and the low noise amplifier (LNA). Our results show that the proper optimization of these modes combined with cooperative relaying may be...

In this work, we propose iterative access point (AP) selection (APS), linear minimum mean-square error (MMSE) precoding and power allocation for Cell-Free multiple-input multiple-output (MIMO) systems. We consider the downlink channel with single-antenna users and multiple-antenna APs. A sophisticated downlink strategy is developed which implies MMSE...

This article presents an analysis of the rate matching method of LDPC codes of the radio access interface 5G New Radio, proposed for the eMBB usage scenario. The objective is to discuss the puncturing and lifting techniques, which guarantee that the code rate change without the need for a complete system change. The obtained results are in agreement with...

Neste trabalho, o método dos Elementos Finitos e dos Elementos de Aresta avaliam um problema de autovalor em duas dimensões. Os algoritmos construídos apresentam soluções numéricas para um guia de ondas retangular, constituído de um condutor elétrico perfeito com vácuo no interior. Os resultados numéricos obtidos, com ambos os métodos, são comparados às...

Both capacity and energy efficiency are crucial for next-generation wireless networks. Hence, due to the dense deployment of BSs in HetNets, consumption is 60% to 80% of the total energy, causing steep costs. Therefore, industry and researchers are working to reduce the energy consumption of HetNets. In order to increase energy efficiency, guaranteeing...