Assessment of energy characteristics of radio lines of perspective systems of satellite broadband access for airmobile subscribers
At the present time broadband access to the Internet, using high throughput satellites (HTS), are increasingly popular for air passengers. Examples of foreign HTS-systems are Inmarsat Global Xpress, Intelsat EpicNG, Eutelsat KaSat, ViaSat-1, 2. Airborne stations are manufactured by Aerospace Honeywell JetWave, ViaSat, AeroSat Astronics, Gilat etc. Therefore, urgent scientific and practical task is the creation of Russian airborne station of satellite broadband access in the Ka-band, working with the Russian HTS and not inferior to foreign analogues by its quality indicators, the main of which from the standpoint of the end user is the information rate in a forward link. In the article the main features of the satellite broadband access systems for airborne users are considered, the methods and results of study of the energy potential and the signal-to-noise ratio, which determines the attainable information rate in a forward link using DVB-S2X standard, are presented. The impact of different modulation-coding schemes is analyzed, in particular, the 256APSK-3/4 modulation coding scheme, which provides the highest spectral efficiency of 5.9 bits / symbol, and the 32APSK-7/9 modulation coding scheme, which provides 3.84 bit / symbol spectral efficiency. The results of calculations allow to choose the operating values of the satellite equivalent isotropic radiated power and the quality factor of the airborne station receiver. Similar calculations can be made with other parameters of the communication system, which will allow you to form the look of a promising domestic Ka-band airborne station, working with domestic high-capacity satellites in the DVB-S2X standard, and develop algorithms for controlling the frequency-energy resource of satellites.