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Telecommunications authorities are interested in knowing the real spectrum occupancy with the aid of several participants in the field of telecommunications. Therefore, several spectrum measurement campaigns have been made around the world. The results show a low spectrum occupancy leading to an inefficient use of the spectrum. This suggests the use of technologies like cognitive radio as a solution...
Spectrum sensing is without doubt the most important part in the implementation of cognitive radio networks. Therefore, many algorithms for signal detection of primary users have been proposed, being those based on spectral correlation the most outstanding, because of their good performance in environments with low signal-to-noise ratio. However, the computational complexity is one of their major...
The exchange of control messages in medium access control protocols for cognitive radio networks is an important issue, due to the need of keeping transmissions of primary (licensed) users free of interferences occasioned by the presence of secondary users. In an underlay access approach, power constrains must be established in order to allow coexistence between primary and secondary users. In this...
PLC is a technology for data transmission over the power line and, it is a very attractive area of research since PLC is potentially suitable for sending data at high rates over the existing power system infrastructure. Synchronization is a fundamental process in any OFDM communication system and its implementation must be efficient and fast. This work presents a real time implementation featuring...
In this paper, the parameters extraction from the Volterra series to analyze the performance of a Digital Predistorter (DPD), for the Power Amplifier (PA) with memory, is introduced in two different ways: (1) different numerical methods for the parameters extraction and (2) the fixed point numerical format implementation for this numerical method. The parameters in the Volterra Model are typically...
In recent years, the very large scale integration techniques applied to the manufacture of the new on-chip radio transceivers has carried some inherent product's imperfections. As a result, various undesirable deviations with respect to the specifications are expected to take place during the operation of these radio transceivers, especially due to imperfections on the Analog Front End (AFE) at radio...
The huge computing power available in some graphic cards may be used to significantly speedup scientific computing compared with common parallel clusters. The low price and virtually ubiquitous Graphics Processing Units (GPU), in conjunction with C style parallel programming tools, like CUDA (Compute Unified Device Architecture), allow the programmers to exploit their fine grain parallelism and multithreading...
This paper presents a description of the principal aspects employed in the development of a speaker verification system based on a Spanish corpus. The main goal is to obtain classification results and behavior using Support Vector Machines (SVM) as the classifier technique. The most relevant aspects involved in developing a Spanish corpus are given. For the front end processing a novel method to suppress...
Several telemedicine applications are proposed within the frame of OURSES project, French acronym for Offer of Rural Use of Services by Satellite, providing services for elderly people. The main objective of this project is to show the interest of using satellites as a complement to terrestrial technologies, in areas where telecommunication infrastructure is lacking or incomplete. This paper describes...
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