Spectrum Sharing for Coexistence of Fixed Satellite Services and Frequency Hopping Tactical Data Link

The growth in wireless communication services together with increasing demand has resulted in the scarcity of spectrum resources. Many researchers have attempted to address the scarcity problem by focusing on spectrum sharing to allow fixed satellite services (FSS) to coexist with other fixed services or other satellite communication systems. However, most secondary users are commercial systems, whose characteristics differ from military systems such as tactical data links (TDLs). A TDL requires anti-jamming capability and multiple operations support; thus, most TDLs use multiple frequency hopping (FH) patterns, known as multinet. To the best of our knowledge, no research has focused on the coexistence of FSS and TDL to date. In this paper, we verify whether spectrum sharing will facilitate the coexistence of FSS and FH-TDL. First, we propose FH-TDL with a spectrum use rule and a new FH method to reduce the pulse collision probability. We then prove that interference from FH-TDL to FSS is permissible. Instead of analyzing interference from FSS to FH-TDL, we simply consider the worst case, i.e., that a signal experiencing interference by FSS is always subject to collisions. We analyze the pulse collision probability under the worst case by constructing the mathematical models rather than using simulation. The numerical results show that the use of appropriate values for the weight parameter enables the proposed FH method to improve the pulse collision probability of FH-TDL.