@article{Ilcev_2020_2, author = {Ilcev, Stojce Dimov}, title = {Analyses of Frequency Division Multiple Access (FDMA) Schemes for Global Mobile Satellite Communications (GMSC)}, journal = {TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation}, volume = {14}, number = {4}, pages = {811-819}, year = {2020}, url = {./Article_Analyses_of_Frequency_Division_Multiple_Access_(FDMA)_Schemes_for_Global_Mobile_Satellite_Communications_(GMSC)_Ilcev,56,1064.html}, abstract = {This paper introduces analyzes of the Frequency Division Multiple Access (FDMA) applicable in Global Mobile Satellite Communications (GMSC). In satellite systems, as a rule, especially in GMSC many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users, however, can be solved by using the Multiple Access Technique (MAT) scheme. Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with a complete charge and to create different MAT schemes to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.}, doi = {10.12716/1001.14.04.04}, issn = {2083-6473}, publisher = {Gdynia Maritime University, Faculty of Navigation}, keywords = {Global Mobile Satellite Communications (GMSC), Frequency Division Multiple Access (FDMA), Multiple Access Technique (MAT), Orthogonal Channels of Transmission, Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Multiple Channels Per Carrier (MCPC), Single Channel Per Carrier (SCPC)} }