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Higher spectrum efficiency is a target of the 5th generation (5G) mobile communications system. Massive MIMO is considered as one of important technologies for that purpose. Under the practical conditions that the number of antennas on user equipment (UE) is limited, multi-user MIMO (MU-MIMO) is a probable use scenario of Massive MIMO. Furthermore, massive connectivity is another important target,...
Tomlinson-Harashima precoding (THP), as a suboptimal realization of dirty paper coding, has attracted extensive attentions in recent years. However, in numerous studies, only a few of them considered the limitations and restrictions in reality. In this paper, we first point out three main limitations and restrictions of THP when implementing it in the framework of a real industrial system, i.e., the...
In this paper, the work demands of the dispatchers in centralized centers were investigated. The factors contributing to the work demands were defined preliminarily by specialist workshops and were determined using a series of methods in a field study. The results of our investigation indicate that the total number of trains and frequency of communication are major roles in the total work demands...
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