In collaboration with the RF research group of the University of Cantabria, the goal of this project was to development power linear amplifiers for communication applications working from microwave to millimetre-wave frequency bands. The work was carried out following two different lines on the basis of the techniques to be used as well as of the frequency band of the system. 1) Firstly, new nonlinear model amplifiers as well as new predistorting and linealisation techniques for low microwave frequency bands (L and C) were developed.
This was a coordinated project in which 10 spanish universities were involved. Its goal was to apply techniques such as neural networks, nonlinear dynamical models and genetic/evolutionary algorithms, including their combinations with advanced signal processing methods (based on higher-order statistics, for instance) to a set of selected problems in the areas of medical imaging, bussiness, energy and communications.
The goal of this project was to design and develop ASICs for distributing satellite digital TV signals through collective antenna systems (SMATV) including the receiver for final users. Specifically, the project was focused on the design of the Transparent Digital Transmodulator (TDT), which performs transmodulation of the signal received at the head-end from QPSK to 64-QAM; as well as for the Integrated Receiver Decoder (IRD), which includes blind equalization of the SMATV channel, demodulation and decoding.
SETEL, S. A., as a part of the european project PROMOSHYGES (BRITE-EURAM 789)
This was a european project within the BRITE-EURAM framework with the final goal of monitoring large turbo-generator sets in hydroelectric plants. The project leader was Iberdrola (SP) and, besides the GTAS group, the rest of partners were ANSALDO (IT), IRCOM (FR), LETI (FR) and the groups of mechanical engineering and photonics of the University of Cantabria. The work of our group was focused on the development of a flexible and powerful acquisition and signal processing unit that we called DASPU (Digital Acquisition Signal Processing Unit).
In this project the GTAS group developed a unit called DAT (Digital to Analog Transmodulator), which receives the satellite digital TV signal (QPSK modulated) and transforms this signal into a conventional analog PAL channel. The DAT carries out the following tasks: QPSK demodulation, FEC channel decoding (Reed-Solomon and Viterbi), demultiplexing of the MPEG-2 stream and audio /video decoding en enconding form MPEG to PAL. We used chips from LSI LOGIC and made the design, implementation and evaluation of the overall system.
In this project we developed a TDT to operate in Satellite Master Antenna TV (SMATV) systems. The goal of the TDT is to transmodulate the digital TV signal from the satellite link modulation (QPSK) to the cable modulation format (64-QAM). The main tasks of the TDT are: QPSK demodulation, forward error correcting code (Reed-Solomon y Viterbi) and QAM modulation. A new Reed-Solomon encoder is introduced as a channel encoder for the cable link. For the design of the TDT we used chips from LSI LOGIC. More than 50000 units of the final product were sold by IKUSI in several countries.