Sergio Jesus

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When a computer is an integral part of a larger system, where it intensively interacts with the surrounding environment and frequently deals with real-time constraints, it is considered an embedded system. This communication describes the embedded system world: architecture, classification, characteristics, system limitations, and trends. It also discusses(More)
The LMMSE (Linear Minimum Mean Square Error) algorithm is one of the best linear receivers for DSCDMA (Direct Sequence-Code Division Multiple Access). However, for the case of MIMO/BLAST (Multiple Input, Multiple Output / Bell Laboratories Layered Space Time), the perceived complexity of the LMMSE receiver is taken as too big, and thus other types of(More)
The ZF (zero forcing) algorithm is one of the best linear receivers for DS-CDMA (direct sequence-code division multiple access). However, for the case of MIMO/BLAST (multiple input, multiple output/Bell Laboratories layered space time) with high loading, the perceived complexity of the ZF receiver is taken as too big, and thus other types of receivers are(More)
The LMMSE (Linear Minimum Mean Square Error) algorithm are one of the best linear receivers for DS-CDMA (Direct Sequence-Code Division Multiple Access). However, for the case of MIMO/BLAST (Multiple Input, Multiple Output / Bell Laboratories Layered Space Time) with high loading, the perceived complexity of the LMMSE receiver is taken as too big, and thus(More)
We present a practical method to approximate good solutions to one of the most studied and difficult optimization problems, the Euclidean Steiner Tree Problem for a large number of points. This method is developed using a genetic algorithm, as the main optimization tool, which was enhanced by some specific heuristics originated from Computational Geometry(More)
One of the currently exciting areas in SONAR research is in the use of acoustic channel models to improve SONAR systems. In this paper, we use the echo pattern at a single phone to localise a sound source in both range and depth in the ocean. To make the localisation robust, the signal processing is set-up with particular regard to which acoustic features(More)
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