Raul L. de Lacerda Neto

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— Ultra-WideBand (UWB) has been recently presented as a promising radio technology due to the large band-width available. This feature enables point to point high data rates at short range as well as high temporal resolution with long Channel Impulse Responses (CIR). Due to the their large bandwidth, UWB systems enables high temporal resolution with long(More)
In this paper, a unified framework for ultra-wideband channel (UWB channel) modeling based on the maximum entropy approach is provided. For a given set of constraints, a consistent model which takes into account the information at hand is obtained. Two cases are considered: channel power knowledge and knowledge of the covariance matrix. The channel power(More)
— In this contribution, we derive the optimal power allocation policy in the case of an uplink multiuser system under quality of service constraints. Interestingly, using asymptotic results (in the number of users and dimensions) of random matrix theory and under the assumption of Minimum Mean Square Error Successive Interference Cancellation (MMSE-SIC) at(More)
This paper investigates the situation where a (large) group of terminals can be connected simultaneously to several base stations using distinct wireless technologies. We introduce and solve the problem of optimally sharing the mobile transmit power between different systems. Key results from asymptotic random matrix theory (when the number of users and the(More)
—During the last years, Ultra-WideBand (UWB) has been presented as a promising radio technology due to the large bandwidth available. This feature enables point to point high data rates at short range as well as high temporal resolution with long Channel Impulse Responses (CIR). Due to the their large bandwidth, UWB systems enables high temporal resolution(More)
This paper evaluates the performance of two PARAFAC-based receiver structures wireless communication systems based on code division multiple access (CDMA). Motivated by the multidimensional nature of the wireless signal, the PARAllel FACtor tensor decomposition (PARAFAC) is an interesting approach to mitigate multiuser interferences and to reconstruct the(More)
— In this work we propose a new receiver structure for space-time block-coded systems that decouples the tasks of CCI cancellation and space-time decoding in two processing stages. The two-stage receiver consists of a multiple-input multiple-output (MIMO) minimum mean square error (MMSE) spatial filter for CCI cancellation connected to a modified(More)
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