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For adaptive equalisation of non-linear satellite channels, artificial Neural Networks (NN) have shown their ability to solve various problems encountered in the related topics: non-linearity arising in satellite data links, equalisation of rapidly time varying and multipath channels, adaptive antennas.
The project aims at developing a demonstrator system for UMTS Satellite links and to carry out the feasibility study of ASIC based subsystems, up to but not including the foundry level.
To this end, the first year of the project has been devoted to the implementation of a non-linear down link satellite channel together with the first studies on Neural Network equalisers and Adaptive Antennas. During the second year of the project, performances of NN algorithms and Adaptive Antennas will be available together with the comparison of NN equalisation methods to classical equalisation techniques. When NN equalisers are validated in simulations their implementation will be done on the hardware prototype. The medium-bit rate of the UMTS satellite application (around 64KBits/s) allows the implementation of a hardware prototype, with todays available subsystems. During year three, when NN algorithms are validated on the prototype, the complete design study and simulation of an ASIC for a non-linear satellite link equaliser will be achieved. ASIC design will be carried out up to the edge of the foundry process. The last step of the project is devoted to the demonstration of the performance of adaptive NN equalisation through technology trials using actual satellite equipments.
Summary of Trial
Trials are of technological nature.
Demonstration of Neural Network equaliser performance with actual satellite non linear components will be achieved. In particular, a testbed allowing to simulate a complete satellite transmission channel including non linear distorsions will be implemented. This testbed will be used to assess the performance of the Neural Network equaliser.
Impact on future UMTS air interface standardisation. Deployment of satellite UMTS will take advantage of unexpensive and efficient equalisation techniques. Also, satellite resource optimisation will lead to more cost efficient S-UMTS systems deployment.
Francis Castanie ENSEEIHT: Ecole Nationale Superieure d'Electronique d'Informatique et d'Hydraulique de Toulouse 2 Rue Camichel, BP 7122 31071 Toulouse cedex 7 France Tel: +33 5 61 58 82 90 Fax: +33 5 61 58 82 37 E-mail: (email removed)
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