Over the course of last several years, DLR has been actively working on developing a new L-band digital aeronautical communication system (LDACS) for civil aviation to meet the capacity requirements for future digital data link communications. LDACS1 is the broadband candidate and employs the Orthogonal Frequency-Division Multiplexing (OFDM) transmission scheme in both forward and reverse links. Furthermore, LDACS1 enables an inlay deployment. In this case, LDACS1 uses the gaps between the adjacent channels used by the distance measurement equipment. On the one hand, the inlay deployment is a promising approach since it increases the spectral efficiency in the L-band. On the other hand, it is a challenging approach, because it leads to mutual interference between LDACS1 and other legacy systems operating in the L-band. The impact of these interferences must not influence the functionality of either LDACS1 or the other legacy systems in the L-band. Joint tactical information distribution system (JTIDS) is such a legacy system operating in the L-band.
JTIDS is a digital military radio system based on code- and time-division multiple-access and provides a jam-resistant mode by employing frequency hopping in a pseudo-random way.
The goal of this Master thesis is to determine the impact of LDACS1 upon JTIDS and to extract conditions, under which LDACS1 does not affect the functionality of JTIDS. This includes firstly building a MATLAB simulation tool for JTIDS and secondly evaluating the performance of JTIDS in the presence of LDACS1 transmission.
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