Xianwei Zhou

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In this paper, for the sake of better global coverage, we introduce a novel triple-layered satellite network architecture including the Geostationary Earth Orbit (GEO), the Highly Elliptical Orbit (HEO), and the Low Earth Orbit (LEO) satellite layers, which provides the near-global coverage with 24 hour uninterrupted over the areas varying from 75° S to 90°(More)
In this paper, a novel method combined the linear and nonlinear methods, named as Partial Transmit Sequence followed by Clipping (PTS-Clipping), is proposed to reduce the peak-to-average power ratio (PAPR) of Radio Over Fiber and Orthogonal frequency division multiplexing (ROF-OFDM) system. The main technique of this method is clipping the processed signal(More)
In this paper, 2-Dimension (2-D) queuing models are constructed to satisfy multiple service requirements of users in LTE network system. Then a self-configuring and self-optimizing model, which can be also called self-managing model, 2-D Model II, is created to make some improvement of 2-D Model I, and also to decrease the call block rate and improve QoS(More)
Security is very important for Internet of Things (IoTs). As a main communication mode, the security mechanism for multicast is not only the measure to ensure secured communications, but also the precondition for other security services. With the analysis of Nyberg’s fast one-way accumulator and its security, we discover that it has the property of(More)