Nejib Boubaker

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Ultra-Wideband (UWB) radio systems have attracted a lot of attention during the last few years. These systems use very low transmission power and spread over a bandwidth of several gigahertz. The very low transmission power and the large bandwidth used, enable an UWB system to co-exist with other narrow band systems. Nevertheless, these narrow band systems(More)
Ultra-wideband (UWB) technology is characterized by transmitting extremely short duration radio impulses. To improve its multiple-access (MA) capability, UWB technology can be combined with traditional spread-spectrum techniques. So far, much of the research has focused on perfect power-control conditions and on employing time-hopping spread-spectrum with(More)
A critical factor in the deployment of spatial multiplexing multiple-input multiple-output (MIMO) systems is the cost of multiple analog transmit/receive chains at the mobile terminal side. To mitigate this problem, antenna subset selection at the transmitter/receive has been proposed. With antenna selection, a small number of analog chains are multiplexed(More)
Surface-mounted permanent magnet synchronous machine (SPMSM) is widely used in various fields due to its high power density and reliability (compressors, turbine generators...) [1], in our case it is used in aeronautics. However, in high-speed operations eddy-current losses can be important and lead to a damage because of an overheating (PM detachment,(More)