This paper presents Low Earth Orbit (LEO) mobile communication system features, analyzes its advantaged and disadvantages, discusses space division multiple access technology as one of the important research areas involved in their development, configuration, maintenance, operation and management.In LEO satellite the problem of huge system capacity and simultaneous communications between many single or multipoint mobile users can be solved by using a well-known beamforming. However common digital beamforming technology consumes a lot of the satellite's power to create a very narrow beams while resources of the satellite systems are limited.In this paper, a tradeoff between digital beamforming and analog beamforming are investigated for the purpose of providing a huge system capacity in limited satellite resources.

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Yaliny is a company whose aim is to create a satellite communication system with a new level of performance. It is planned that the system will, having been fully deployed, provide communication services and fast Internet connection to any customer all over the Globe.The system is designed so that its link budget will allow having up to several million users all over the world utilizing the network simultaneously.In this paper, the mission plan and the ways the satellite constellation will work are described. In addition, some aspects of the satellite antenna system development are discussed: the paper mentions modern requirements lodged onto communication systems today, as well as the solutions Yaliny engineers are developing to meet those requirements.

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