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An optimal predictive voltage control based on the deadbeat control scheme is proposed in this paper, which can eliminate the error caused the control delay and can be implemented without transforming to dq rotating coordinate system. So this method can simplify the design process of the control system. Additionally, it simplifies the implementation of switching states based on the principle of space...
Due to the extra loss resulting from tunnel curve, most of the theoretical models cannot be directly used for propagation inside curved tunnels. In this paper,extensive simulations are made for propagation at different frequencies in different types of curved tunnels, by using a ray-tracing simulator that is validated by numerous measurements. From the simulated received power, the extra losses of...
Wave propagation experiences extra loss in curved tunnels, which is highly desired for network planning. Extensive narrow-band propagation measurements are made in two types of Madrid subway tunnels (different cross sections and curvatures) with various configurations (different frequencies and polarizations). A ray tracer validated by the straight and curved parts of the measuring tunnels is employed...
Compared with the leaky feeder, distributed antenna systems (DAS) are treated as a more economic and promising solution to support radio coverage in tunnels. Based on the measurements performed in realistic subway tunnels in Madrid at 2.4 GHz, a statistic model for the propagation in tunnels is presented. Two groups of measurements (conducted in subway tunnels and railway tunnels, respectively) are...
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