System noise temp. at LNA 25.7 dBK 2.1.8 Uplink C/N0 The baseline uplink link budget is given in Table A5-3. It is optimised for 0 degree ship elevation angles. It can be seen from Table A5-3 that the is better than 74 dBHz for ship elevation angles C/N0 between 0 and 65 degrees. A5-3 VDE-SAT Uplink link budget, 6 W ship transmit power Ship Ship Satellite Ship Polarization elevation antenna Range Path loss antenna Satellite G/T C/N0 e.i.r.p. loss angle gain gain deg dBi dBW dB km dB dBi dB/K dBHz 0 3 10.8 3 2 830 145.56 8 73.2 −17.6 10 3 10.8 3 1 932 142.25 8 76.5 −17.6 20 2.5 10.3 3 1 392 139.40 8 78.9 −17.6 30 1 8.8 3 1 075 137.16 7.8 79.4 −17.8 40 0 7.8 3 882 135.44 6.9 79.2 −18.7 50 6.3 3 761 134.16 5.5 77.6 −1.5 −20.1 60 4.8 3 683 133.22 3.6 75.2 −3 −22 70 3.8 3 635 132.58 0.7 71.9 −4 −24.9 80 3 608 132.21 -2.2 63.4 −10 −2.2 −27.8 90 3 600 132.09 -5.5 50.2 −20 −12.2 −31.1 2.1.9 Propagation effects See Section 2.1.10 of 4. 2.2 Physical layer modulation schemes VDE-SAT uplink supports different modulation to maximise spectral efficiency and throughput. The supported modulation methods are given in Table A5-4. A5-4 Uplink modulation methods Maximum Adjacent Channel Data Modulation Index Bits/symbol Bit mapping Interference level with worst case type Doppler Gray encoded 1 2 Figure A5-2 QPSK and OQPSK Gray encoded 2 3 Figure A5-3 8PSK 3 4 16APSK Figure A5-4
System noise temp. at LNA 25.7 dBK 2.1.8 Uplink C/N0 The baseline uplink link budget is given in Table A5-3. It is optimised for 0 degree ship elevation angles. It can be seen from Table A5-3 that the C/N0 is better than 74 dBHz for ship elevation angles between 0 and 65 degrees. A5-3 VDE-SAT Uplink link budget, 6 W ship transmit power Ship elevation angle Ship antenna gain Ship e.i.r.p. Polarization loss Range Path loss Satellite antenna gain Satellite G/T C/N0 deg dBi dBW dB km dB dBi dB/K dBHz 0 3 10.8 3 2 830 145.56 8 −17.6 73.2 10 3 10.8 3 1 932 142.25 8 −17.6 76.5 20 2.5 10.3 3 1 392 139.40 8 −17.6 78.9 30 1 8.8 3 1 075 137.16 7.8 −17.8 79.4 40 0 7.8 3 882 135.44 6.9 −18.7 79.2 50 −1.5 6.3 3 761 134.16 5.5 −20.1 77.6 60 −3 4.8 3 683 133.22 3.6 −22 75.2 70 −4 3.8 3 635 132.58 0.7 −24.9 71.9 80 −10 −2.2 3 608 132.21 -2.2 −27.8 63.4 90 −20 −12.2 3 600 132.09 -5.5 −31.1 50.2 2.1.9 Propagation effects See Section 2.1.10 of 4. 2.2 Physical layer modulation schemes VDE-SAT uplink supports different modulation to maximise spectral efficiency and throughput. The supported modulation methods are given in Table A5-4. A5-4 Uplink modulation methods Index Bits/symbol Data Modulation type Bit mapping Maximum Adjacent Channel Interference level with worst case Doppler 1 2 Gray encoded QPSK and OQPSK Figure A5-2 2 3 Gray encoded 8PSK Figure A5-3 3 4 16APSK Figure A5-4