Satellite communication systems 7 Satellite communications 4 Satellites 4 Low earth orbit satellites 3 Numerical methods 3 Orbits 3 Technology: general issues 3 Communication satellites 2 Energy efficiency 2 Energy utilization 2 Error correction 2 Fast Fourier transforms 2 Genetic algorithms 2 History of engineering and technology 2 Hybrid automatic repeat request 2 Hybrid automatic repeat-request protocol 2 Hybrid-automatic repeat request 2 Hybrid-automatic repeat request protocols 2 IR-HARQ protocol 2 Incremental redundancy 2 Incremental redundancy hybrid automatic repeat request protocol 2 LEO satellite communication 2 Low earth orbit satellite communication 2 Power allocations 2 Satellite links 2 Stochastic systems 2 energy efficiency 2 power allocation 2 satellite communications 2 A5-GMR-2 stream cipher 1