Adaptive Fractional Predistortion Techniques for Satellite Systems based on Neural Networks and Tables

This paper addresses the problem of code acquisition in the presence of interference considering the Galileo system. The stringent requirements in terms of Quality of Service and signal integrity that characterize the Galileo system impose in fact to design efficient countermeasures against all interference sources that can considerably impair the received signal. In this context, the impact of continuous wave (CW) interference on the performance of Galileo primary code acquisition in E1 band is first assessed. Then, the adoption of a low-complexity interference mitigation technique at the terminal side is proposed as a countermeasure against interference-induced degradation. Simulation and analytical results are presented showing interesting performance trade-offs, and identifying typical values of the signal-to-interference power ratio below which the interference excision is undoubtedly convenient, and the distortion introduced by the mitigation filter is affordable compared to the gain brought in by interference cancellation.