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This year, the final works on launching two-way satellite time and frequency transfer (TWSTFT) station in Warsaw are going to be completed. The facility of Central Office of Measures (GUM), organization responsible for maintaining the Polish realization of the international Universal Coordinated Time (UTC(PL)) is located in the center of city and is surrounded by a number of high buildings. Therefore...
TWOTFT has been studied and implemented according to the similar principles to those of TWSTFT. We initially constructed the experiment system for TWOTFT and done some experiments such as time and frequency transfer through the laboratory optical fiber and the real optical fiber links including the real link with 109 km length at NIM. We can get the time stability of less than 6 ps/s and 0.9 ps/100s,...
In this paper, through jointly considering the interference caused to the primary user (PU) from one pair of secondary transceivers, the optimal power allocation is studied for the underlay cognitive two way network. Under the quality of service constraint of the PU transmission, two different objective functions are considered for the SUs to maximize the sum achievable rate or maximize the minimal...
A practical implementation of a two way Quantum Key Distribution protocol namely the LM05 protocol with the Weak+Vacuum decoy state protocol having the double photon gain excluded from the final secure key rate calculation is reconsidered. The numerical analysis result has shown that the performance was better than the case when single and double photon gain was lumped.
We consider a practical implementation of decoy state protocol with a two way Quantum Key Distribution protocol using the Weak+Vacuum decoy state scheme. The result from numerical simulation was very encouraging given that the maximum secure distance was very close to the case of maximum theoretical limit using infinite decoy state.
The computational procedures used to analyze two-way stop-controlled intersections were extended in the National Cooperative Highway Research Project 3-46 to account for a number of effects commonly observed at actual unsignalized intersections. This paper presents theoretical extensions that can account for commonly observed phenomena, such as two-stage gap acceptance when median storage is available;...
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