In this paper, we propose a cooperative hybrid spectrum sharing protocol by jointly considering interweave (opportunistic) and underlay schemes. In the proposed protocol, secondary users can access the licensed spectrum along with the primary system. Our network scenario comprises a single primary transmitter-receiver (PTx-PRx) pair and a group of M secondary transmitter-receiver (STx-SRx) pair...

This paper introduces the theory of channel modeling for positioning applications in UHF RFID. It explains basic parameters for channel characterization from both the narrowband and wideband point of view. More details are given about ranging and direction finding. Finally, several positioning scenarios are analyzed with channel models developed. All the described models use a degenerate channe...

We present the design of a remotely deployable distributed wireless antenna system formed from wireless sensor network nodes. Specifically, the focus is on enhancing the detection range of a distributed wireless antenna system. The primary objective is to create a methodology to steer the beam in the desired direction to enhance radio frequency (RF) direction finding and follow-on signal recept...

A convenient technique for calculating completed topological tensor products of functional Fréchet and DF spaces is developed. The general construction is applied to proving kernel theorems for a wide class of weighted spaces of smooth and entire analytic functions.

In this paper, we tried to develop a vowel training assistant method using vowel formant statistics. Formant statistics were obtained from PBW set consists of 452 words from 8 persons. Then, we calculated distance from input formants to each center of vowel formant space. Based on the distance, directions to correct the speaker's manner of articulations, i.e. position of jaw and tongue.

Institute for Software Technology, Graz University of Technology, Austria, Department of Mathematics, IMFM, and Department of Mathematics, FMF, University of Ljubljana, Slovenia. Departamento de Matemáticas, CINVESTAV, México DF, Mexico. Instituto de Matemáticas, Universidad Nacional Autónoma de México. Departament de Matemàtica Aplicada IV, Universitat Politècnica de Catalunya, Barcelona, Spai...