Carlos J. Escudero

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In this correspondence, we reply to the comments in Gu et al. [“Comments on ‘A blind signal separation method for multiuser communications,’” IEEE Transactions on Signal Processing, vol. 55, no. 5, pp. 2355–2356, May 2007]. We explain that the global convergence analysis of the method in Castedo et al. [“A blind signal separation method for multiuser(More)
Biological homogenization is defined as a process that occurs when native species are replaced by common and dominant exotic species or due to depletion and expansion of native species, reducing the beta diversity between areas or habitats. Islands are particularly vulnerable to plant invasion, and as a consequence, homogenization is a process that can(More)
In the present work, two industrial vegetable wastes, grape stalk, coming from a wine producer, and exhausted coffee, coming from a soluble coffee manufacturer, have been investigated for the removal of Cu(II) and Ni(II) from aqueous solutions in presence and in absence of the strongly complexing agent EDTA. Effects of pH and metal-EDTA molar ratio,(More)
The growth of wireless and mobile communications technologies offers new possibilities for context driven information systems. Specifically, nowadays, mobile phones are equipped with several radio-frequency technologies, like Global System for Mobile Communications (GSM),WiFi or Bluetooth. In this way, the idea of using them to create a location system(More)
In this paper we address the problem of indoor tracking using received signal strength (RSS) as a position-dependent data measurement. Since RSS is highly influenced by multipath propagation, it turns out very hard to adequately model the correspondence between the received power and the transmitter-to-receiver distance. Although various models have been(More)
Finite length CMA equalizers contain undesired minima termed Length Dependent Local Minima (LDLM). We note that for auto-regressive (AR) channels, the equalizer output is correlated with a delayed input at these minima. This property is then used to modify the CMA cost function and remove the LDLM in AR channels. Permission to publish this abstract(More)
The problem of blind channel identification for direct-sequence/code-division multiple-access (DS/CDMA) multiuser systems is explored. For wideband DS/CDMA signals, multipath distortion is well modeled by a finite-impulse response filter. In this work, a blind channel identification technique based on second-order statistics is investigated. The method(More)
Nanophases of J-aggregates of several achiral amphiphilic porphyrins, which have thin long acicular shapes (nanoribbons), show the immediate and reversible formation of a stationary mechano-chiral state in the solution by vortex stirring, as detected by their circular dichroic signals measured by 2-modulator generalized ellipsometry. The results suggest(More)