Capture effect and its enhancement in LEO satellite channel

To efficiently support bursty short message transmission in little LEO satellite communication networks, ALOHA protocols with ACK-list and event-based slot timing are proposed. The capture effect, commonly existing in fading channels, is exploited to improve the throughput of the protocol. This paper makes the first attempt to investigate the capture effect in LEO satellite channels, and outlines a picture of the capture effect. Moreover, a novel scheme to enhance the capture effect by a protocol approach is proposed. The simulation results show that the division of a footprint into ring-shaped areas, in combination with a biased transmitting power assignment substantially strengthens the capture effect, and consequently improves the throughput of the protocol