André Mendes Cavalcante

André Mendes Cavalcante
Ericsson · Ericsson Research

Doctor of Engineering

About

61
Publications
15,656
Reads
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1,009
Citations
Introduction
Solid background in applied electromagnetism, wireless channel modeling, radio resource management, ray-tracing techniques for radio propagation, and system/link/network modeling and simulation. Large experience in R&D projects with international cooperation with Industry and University on multiple radio access technologies (3G, LTE, 5G and Wi-Fi). Author of 50+ papers in top-tier journals and conferences, 15+ filed or granted patents, and contributions to standardization forums as IEEE 802.11.
Additional affiliations
April 2016 - present
Ericsson
Position
  • Senior Researcher
August 2008 - December 2015
Universidade Paulista
Position
  • Professor (Full)
February 2007 - February 2016
Instituto Nokia de Tecnologia
Position
  • Engineer

Publications

Publications (61)
Article
This letter investigates the performance of a new blind method for effective channel estimation in user-centric cell-free massive multiple-input multiple-output (MIMO) networks. To this end, comparisons with the perfect and statistical channel state information (CSI) methods are performed assuming different precoding choices. The results demonstrat...
Article
In this letter, we investigate the impact of non-reciprocities in cell-free massive MIMO with non-orthogonal multiple access (NOMA). To this end, closed-form expressions for the users’ spectral efficiency (SE) are derived assuming pilot contamination, imperfect successive interference cancellation (SIC), and non-reciprocal channels. Based on the at...
Article
Full-text available
Recent research points out that transmission at terabits per second (Tbps) is feasible over copper cables if they were used as millimeter waveguides. The challenge is how to efficiently couple signals to the higher-order modes of twisted-pairs. This paper investigates the effectiveness of radial antennas on the coupling of near-terahertz signals to...
Article
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A trend for the 5th generation fixed broadband access networks is to provide data rates as high as 10 Gbps to the subscribers. Since fiber-to-the-home (FTTH) connectivity is still expensive, the use of alternative architectures is attractive in some scenarios. In this context, the International Telecommunication Union (ITU) is standardizing the MGf...
Article
Full-text available
Globalization, digitalization, and urbanization are progressing at a fast pace in cities and regions across the world. New technologies and innovations typically reach urban regions first, where Return on Investment (ROI) tends to be higher than in remote or rural areas, which are characterized by low population densities, low potential revenues, a...
Article
The 5G mobile communication systems introduce multiples functional splits between base station elements, new transmission bands and a large number of antennas supporting beamforming. In this scenario, a viable strategy to avoid building penetration losses is to deploy the antenna elements indoor and use a fronthaul link to establish the connection...
Article
Full-text available
The next generation of mobile communication system will allow a plethora of new services and use cases. By offering support for high throughput connections, low latency response and massive number of connections, the fifth generation of the mobile network will trigger applications unseen in any other network. However, one important application scen...
Conference Paper
Traditionally, copper-based technologies use twisted-pair cables as transmission lines. Alternatively, a recent study indicates the possibility of achieving Tbps over those cables by exploiting their high-order guided modes; i.e., a waveguide approach. Even so that study is a fresh breath to ordinary twisted-pair cables as transmission media, it mi...
Conference Paper
Full-text available
Recently, the exploitation of twisted pairs used as waveguide, as an alternative to the transmission lines mode, has gained prominence, mainly in order to reach the high demands of data. One of the challenges for this implementation is the coupling of the guided modes in the twisted pair, in this context, this paper aims to investigate the coupling...
Conference Paper
Full-text available
The exploration of higher order or guided modes in twisted pair cables, as an alternative to the currently used transmission line mode, was recently proposed with the objective of reaching rates at Tbit/s levels. In this context, this paper evaluates from numerical simulations the use of twisted pair’s guided modes. The results are evaluated in ter...
Conference Paper
In this paper, we present an investigation about the potential of coaxial networks for 5G fronthaul. The study is motivated since some countries have a big coaxial infrastructure that could potentially be used for 5G applications. In this context, we propose here a fronthaul scheme with analog radio over coaxial cables and evaluate the maximum numb...
Article
Full-text available
The introduction of a high number of small cells in cellular networks and the complementary adoption of WLAN technologies in unlicensed spectrum are interesting options to attend the increasing demand for Internet traffic in wireless broadband access networks. One alternative for integrating both solutions is the aggregation of ISM unlicensed spect...
Article
Full-text available
Unlicensed spectrum is increasingly being used by mobile operators to meet the mobile traffic demand, and Wi-Fi is foreseen as one of the technologies for implementing mobile traffic offloading. However, Wi-Fi efficiency does not scale well as node density increases, and IEEE 802.11ax Task Group (TGax) was created in 2014 for developing Wi-Fi techn...
Patent
Full-text available
Methods, apparatuses, and computer programs for assigning measurement groups in a wireless network are disclosed. The measurement group may be announced by measurement group information comprised in a broadcast message transmitted in the wireless network. Reporting may be triggered by transmission of a request-to-report message transmitted in the w...
Patent
Full-text available
In one aspect the embodiments of the invention provide a method that includes transmitting a first frame comprising a first type of message from a first node for reception by a second node. The first node is associated with a first wireless communication system and the second node is associated with a second wireless communication system. The first...
Patent
Full-text available
This document discloses a solution for reducing interference between wireless networks. According to an aspect, a method comprises: acquiring, by an access node of a first wireless network from at least one node of the first wireless network, information on at least one interfering node of a second wireless network; generating, by the access node,...
Patent
Full-text available
There is provided a method, including receiving, by a receive node, a transmission request message for data transmission from a transmit node of a first basic service set, wherein the transmission request message includes an indication of a modulation and coding scheme to-be-used in the data transmission; detecting signal strength of the transmissi...
Article
Full-text available
The expansion of wireless broadband access network deployments is resulting in increased scarcity of available radio spectrum. It is very likely that in the near future, cellular technologies and wireless local area networks will need to coexist in the same unlicensed bands. However, the two most prominent technologies, LTE and Wi-Fi, were designed...
Conference Paper
Full-text available
The default medium access mechanism for Wi-Fi, Distributed Coordination Function (DCF), is a simple contention based protocol aimed at providing a fair distribution of resources among Wi-Fi nodes. However, DCF suffers from significant performance degradation in the presence of dense deployments. Hence, improving the performance of the Wi-Fi MAC lay...
Conference Paper
Full-text available
The increasing commercial success of Wi-Fi and the wireless communication industry forecast of exponential traffic growth for the next years indicate Wi-Fi dense deployments as scenarios more and more common in the future. Wi-Fi was not designed to operate in such scenarios. Because of its contention based channel access and backoff procedure, Wi-F...
Conference Paper
Full-text available
Spectrum sharing is a powerful alternative to deal with the exponential increase on the wireless communication capacity demand. In this context, the coexistence of two of the most prominent wireless technologies today, Long Term Evolution (LTE) and Wi-Fi, is an important research topic. In the most common Wi-Fi network operation, the Distributed Co...
Conference Paper
Full-text available
Wireless communications industry foresees an exponential increase of the traffic demand for the next years. Spectrum scarcity for the operation of cellular networks makes the use of unlicensed spectrum an attractive alternative for traffic offload. From the technical perspective, LTE pico/femtocells arise as the preferable traffic offload solution....
Conference Paper
Full-text available
The recent development of regulatory policies that permit the use of TV bands spectrum on a secondary basis has motivated discussion about coexistence of primary (e.g. TV broadcasts) and secondary users (e.g. WiFi users in TV spectrum). However, much less attention has been given to coexistence of different secondary wireless technologies in the TV...
Conference Paper
Full-text available
The deployment of modern mobile systems has faced severe challenges due to the current spectrum scarcity. The situation has been further worsened by the development of different wireless technologies and standards that can be used in the same frequency band. Furthermore, the usage of smaller cells (e.g. pico, femto and wireless LAN), coexistence am...
Conference Paper
The recent development of regulatory policies that permit the use of TV bands spectrum on a secondary basis has motivated discussion about coexistence of primary (e.g. TV broadcasts) and secondary users (e.g. WiFi users in TV spectrum). However, much less attention has been given to coexistence of different secondary wireless technologies in the TV...
Conference Paper
Location Based Services can generate variety of new commercial applications and create new streams of revenue. However, there is currently no simple indoor positioning method for low-end devices which have no Wi-Fi or GPS capability. This paper presents a novel and simple audio-based localization system to provide location-aware content for low-end...
Conference Paper
Full-text available
Current mobile devices continuously estimate their locations, allowing users to “check in”, find nearby friends and interests, and determine routes to their destinations. While underlying satellite, cell, and WiFi-based positioning systems can return an accurate and meaningful position in many cases, extending them to work energy-efficiently, parti...
Article
Full-text available
We describe the design, implementation, and eval-uation of Molé, a mobile organic localization engine. Unlike previous work on crowd-sourced WiFi positioning, Molé uses a hierarchical name space. By not relying on a map and by being more strict than uninterpreted names for places, Molé aims for a more flexible and scalable point in the design space...
Conference Paper
Full-text available
For some time, software development companies are looking for new methodologies in order to optimize the development process, agile methodologies are becoming increasingly popular and testing of software is undergoing changes to incorporate this new reality. In this paper a study is reported in a research institute to discuss the practical work on...
Conference Paper
Full-text available
Product development nowadays requires great focus on time to market, as well as in quality, in order to meet customer expectations. Several agile methods and methodologies have been proposed to tackle the early release of software products and meet these stringent deadlines. However, in an agile team, the quality guarantee usually performed by test...
Conference Paper
Full-text available
This paper intends to propose a novel handover algorithm to balance the load of the layers in a multi-reuse scenario. Each layer works independently from each other and it has its own scheduling process, coverage and mobile stations attached. The algorithm proposed balances the resources among layers by moving mobile stations from one to another la...
Conference Paper
Full-text available
Antenna diversity is a well-known technique to increase data rate and coverage in fading environments, and it can be applied both at the transmitter or at the receiver side of a transmission link. New broadband wireless systems, such as Mobile WiMAX (IEEE 802.16e-2005 standard), rely on several antenna diversity approaches like Maximum Ratio Combin...
Conference Paper
Full-text available
A receiver for a MIMO OFDM communication system using direct conversion transceivers is proposed. The novel receiver takes advantage of the I/Q imbalance inherent to the direct conversion operation. It can be shown that the I/Q imbalance in multicarrier communication systems creates an additional frequency diversity. By adequately exploiting such d...
Article
Full-text available
A new computational parallel model based on 3D ray-tracing for radio propagation prediction is presented. This approach considers that the main tasks in a 3D ray-tracing technique can be evaluated in an independent and/or parallel way. The workload distribution among the participant nodes of the parallel architecture (cluster of PC's) is performed...
Conference Paper
In this work a tutorial about mobile WiMAX technology is presented, based on IEEE802.16e standards. A technical description of the radio interface of this technology will be made, and some aspects related to standardisation, regulation and business applications will be briefly analysed.
Conference Paper
Full-text available
A computational parallel model based on 3D ray-tracing for wireless channel modeling is presented. This approach considers that the main tasks in a 3D ray-tracing technique can be evaluated in an independent and/or parallel way. The workload distribution among the participant nodes of the parallel architecture (cluster of PC's) is performed through...
Conference Paper
Full-text available
A computational parallel model based on 3D ray- tracing for radio-propagation prediction is presented. This approach considers that the main tasks in a 3D ray-tracing technique can be evaluated in an independent and/or parallel way. The workload distribution among the participant nodes of the parallel architecture (cluster of PC's), is performed th...
Conference Paper
Full-text available
Resumo— — Neste artigo, alguns modelos classicos de ´ propagac¸ao de ondas para ambientes florestais s ˜ ao otimizados ˜ atraves de uma metodologia designada de neuro-adaptac¸ ´ ao. ˜ Nesta abordagem, os modelos classicos s ´ ao primeiramente ˜ adaptados (ajustados) com base em campanhas de medic¸oes, ˜ sendo posteriormente combinados em paralelo a...
Conference Paper
Full-text available
This paper presents a computational parallelization strategy applied in propagation models based on 3D ray-tracing techniques. This approach considers that the rays are independent from each other, what allows a uniform division of the tasks by equal and random distribution of rays among the parallel computer nodes. The strategy efficiency is prove...
Conference Paper
Full-text available
Este trabalho apresenta um ambiente computacional baseado em Web para estudo de rádio-propagação em problemas clássicos. A abordagem eletromagnética dos problemas é realizada através das técnicas de traçado de raios juntamente com a Teoria Uniforme da Difração (UTD). A modelagem Web é realizada através da linguagem de programação orientada à objeto...
Article
Resumo  Um simulador tridimensional (3D) de traçado de raios para caracterização de canais rádio-móvel é apresentado. A teoria eletromagnética adotada pelo simulador é baseada na UTD e o método para o traçado dos raios é baseado na Teoria das Imagens (IT). A caracterização do canal rádio-móvel é feita através das predições da perda de potência e d...
Article
Full-text available
A challenging offering a continuous education is the universal support software available to learning, to be used within curricula structures in engineering courses. An alternative is to release as tools in available sites, so they are available in any places at any time. Nevertheless, it is difficult to join in a site several softwares which were...
Article
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Resumo  Neste trabalho são apresentadas duas abordagens complementares de simulação para a modelagem e avaliação de desempenho de canais rádio-móvel. A primeira abordagem é baseada na avaliação do meio físico e seu modelo de propagação associado, fazendo uso de um simulador baseado nas técnicas de traçado de raios tridimensional (3D) denominado RT...
Article
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Resumo:-- Neste artigo, um modelo computacional paralelo de traçado de raios 3D aplicado na predição de radiopropagação é apresentado. A abordagem considera que as principais tarefas de uma técnica de traçado de raios 3D podem ser avaliadas de forma independente e/ou paralela. A distribuição da carga de trabalho entre os nós da arquitetura paralela...
Article
Full-text available
A computational parallel model based on 3D ray-tracing for radio-propagation prediction in MIMO systems and multi-floor scenarios is presented. This approach considers that the main tasks in a 3D ray-tracing technique can be evaluated independently thus in an parallel way. The workload distribution among the participant nodes of the parallel archit...
Article
Full-text available
Resumo  Este artigo propõe uma estratégia de paralelização computacional aplicada em modelos de propagação baseados nas técnicas de traçado de raios 3D (Ray-tracing 3D). A estratégia abordada baseia-se no conceito de independência dos raios, que permite uma divisão uniforme das tarefas através da distribuição eqüitativa dos raios entre os nós form...

Projects

Projects (4)
Archived project
Archived project
Archived project
Investigation of challenges and proposal of solutions for co-existence between LTE and Wi-Fi.