Raul de Lacerda

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We present in this survey new technologies proposed for the evolution of the aeronautical communication infrastructure. Motivated by studies that estimate a growth of the air traffic flow, a joint Euro-American project was launched in 2004 to provide solutions adapted to the future aeronautical scenario (air-air communication, traffic optimization...). This(More)
This work presents some initial results concerning the MIMO channel capacity of real wireless channels in the UMTS-TDD band using the Eurecom MIMO Openair Sounder (EMOS). This paper describes the necessary steps to estimate in real-time the wireless MIMO environment, offering the possibility to identify reliable MIMO channels as well as instantaneous(More)
General and commercial aviation authorities have been using amplitude modulation communication systems for more than 70 years. Due to the great increase of air traffic during the last years, the VHF band tends towards saturation, whereas the aeronautical community faces new requirements: data rate, spectral efficiency and network capacity (maximum number of(More)
The parametric estimation of Multiple-Input Multiple-Output (MIMO) channels is an important step towards the space-time characterization of the radio channel as well as for the design of efficient space-time signaling techniques. In this paper, we address the problem of multipath parameter estimation for frequency-selective block-fading MIMO channels by(More)
This paper investigates the situation where a group of terminals can be simultaneously connected to several base stations using distinct technologies on nonoverlapping frequency bands. We introduce and solve the problem of optimal power allocation (in the sense of the ergodic sum-rate) for the terminals in the uplink, using three types of receivers: the(More)
In wireless communication, interference between two radio systems may occur when they operate at close frequency bands, sharing the same environment at the same time. Such systems coexist if both of them perform correctly in the presence of the other. To ensure their coexistence, Electromagnetic Compatibility (EMC) is used to specify rules within(More)
Energy Efficiency (EE) has become one of the main challenges for the development of wireless communication systems. Thus, many researchers are investigating new solutions to save power. For this reason, in this paper we apply a method based on modulation and coding scheme (MCS) for multiband orthogonal frequency division multiplexing (MB-OFDM) ultra(More)
This work presents results concerning the MIMO channel capacity of a real wireless channel. For the analysis, we developed a real time UMTS MIMO Sounder platform at Eurecom Institute. The platform, also called EMOS (Eurecom MIMO Openair Sounder), is able to give actual information of the channel environment, offering a possibility to estimate the MIMO(More)
In this contribution, we describe the potential of SDR4all (Software Defined Radio for all) to solve the bottlenecks and reduce the innovation cycle related to the design and implementation of flexible radio algorithms. SDR4all is a programmable software tool with radio cards for wireless researchers, students and engineers. It enables to implement in(More)
In this contribution, some results on the downlink capacity of MIMO Multi-user Networks are provided when only the scattering environment (and not the channel realization) is known at the transmitter. Considering a multi-user system where each terminal employs multiple antennas (including the Base Station), asymptotic (in the number of antennas) analytical(More)