Bit error rate Cooperative reception 1 Directive antennas 1 Diversity combining 1 Ground stations 1 Multiple satellites 1 Omnidirectional antennas 1 Receive-diversity 1 Reception quality 1 SIMO 1 Satellite antennas 1 Satellite downlink 1 Satellite ground stations 1 Satellites 1 Sensor networks 1 Small-satellite 1 Software radio 1 System outages 1 Virtual ground station 1 cooperative reception 1 diversity combining 1 receive diversity 1 virtual ground station 1