Abstract

The paper is related to an adaptive satellite communication system for data transmission from small, low cost, low Earth orbit (LEO) satellites. The adaptation is provided in order to increase the total amount of data that can be downloaded during a single satellite pass over a ground station and consists in changing the modulation scheme and code rate during the transmission according to the temporary characteristics of the propagation channel. The benefits and problems resulting from the use of the adaptation mechanism for communicating with LEO satellites were investigated in a model set up using software-defined radio (SDR) modules and common personal computers (PC). The model included a transmitting part acting as a satellite, a receiving part acting as a ground station, and a satellite propagation channel simulator.

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