Differential Delay Effect in Precoded Cooperative Multi-Gateway Satellite Systems

Abstract—In this paper, we study the effect of differential
delay on the performance of a centralized and cooperative
multi-gateway satellite system, where multiple spatially
separated gateways transmit simultaneously in the feeder
forward link, each serving a cluster of beams. Full frequency
reuse is assumed in the user forward link and thus
precoding is employed at the central gateway to mitigate
the interference, before the precoded signals are distributed
to the remote gateways to be sent to the satellite. Simulation
results considering the DVB-S2X waveform show that
channel state information (CSI) estimation, and as a result
the signal-to-interference-plus-noise ratio (SINR), can be
significantly degraded, when the inter-cluster interference
originating from different gateways is high, emphasizing
the importance of user scheduling in this architecture such
that the inter-cluster interference is minimized.