Block Equalization for Single-Carrier Satellite Communications with High-Mobility Receivers

We compare some block equalizers for single-carrier satellite systems subject to hard propagation conditions such as high Doppler spread, non-line-of-sight (NLOS), and non-negligible multipath fading. These impairments are relevant when the very high speed of a mobile receiver forces to use a non-directional antenna. First, we compare low-complexity time-domain and frequency-domain block equalizers. Then, we propose a novel frequency-domain equalizer based on a fast Fourier transform (FFT) with size higher than the length of the processed block. Thanks to the increased frequency resolution, the proposed equalizer yields improved performance with respect to the conventional frequency-domain equalizer. Simulation results validate the effectiveness of the proposed technique.