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Nowadays authentication has become an important technology in the fields of network security. Because of the limitation of the resource and computing capability in wireless sensor network, a kind of simple and efficient authentication protocol needs to be taken into account. Moreover, a few security flaws have been found in a few related protocols. Therefore, an authentication protocol has been presented...
In order to research the motion performance of vortex rings umbrella, finite element analytical approach is integrated to realize the complicated time varying motion mathematical model of vortex rings umbrella, as well as implements simulation and conformity validation for the model. At first, particle system is utilized to construct three-dimensional geometrical model of vortex rings umbrella according...
Scanning Electron Microscope (SEM) is widely used in many fields to look into the nanometer world. However, there is non-linear distortion near the left boundary of high resolution images captured by SEM, which has bad effect on image processing such as image mosaic. In this paper, we propose a method to correct such distortion based on non-equidistant GM(1,1) model. We first extract pair-wise points...
To make the implementation of high-rate space-time block code (STBC) realistic in practical systems, fast-decodable (FD) and group-decodable (GD) code structures have been separately introduced into STBC to reduce the sphere decoding complexity. However, no STBC has both the two code structures until now. In this paper, high-rate fast-group-decodable STBC (FGD-STBC, which has both FD and GD code structures)...
We consider opportunistic scheduling in a downlink OFDMA system to support heterogeneous services. Given the user's queue state information (QSI) and channel state information (CSI), the proposed sum waiting time based scheduling (SWBS) algorithm can guarantee QoS requirements for both real-time (RT) and non-real-time (NRT) service. The benefit is attained from scheduling heterogeneous services based...
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