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In this paper, a distributed compressive spectrum sensing scheme in wideband cognitive radio networks is discussed. An AIC RF front-end sampling structure is proposed requiring only low rate ADCs and few storage units for spectrum sampling. Multiple CRs collect compressed samples through AICs and recover spectrum jointly. A novel joint sparsity model is(More)
The users of cognitive radio network are working in a highly time-varying environments. The classic ergodic capacity definition fails to capture the dynamic property of wireless channels. In the paper, we set up a new model to characterize the time-varying property of wireless channels. Firstly, we established a dynamic optimal rate allocation model under(More)
Zhangjiangkou Mangrove National Nature Reserve is a subtropical wetland ecosystem in southeast coast of China, which is of dense population and rapid development. The concentrations, sources, and pollution assessment of trace metals (Cu, Cd, Pb, Cr, Zn, As, and Hg) in surface sediment from 29 sites and the biota specimen were investigated for better(More)
In the paper of M. Franceschetti's, they prove there existing a considerable number of open paths in wireless networks, called highway system. Their theoretical analysis shows the highway system is the key to the efficient operation of wireless networks. This paper established a line process model for the highway systems of wireless networks, and(More)
The ingestion of microplastics by five natural zooplankton groups in the northern South China Sea was studied for the first time and two types of sampling nets (505μm and 160μm in mesh size) were compared. The microplastics were detected in zooplankton sampled from 16 stations, with the fibrous microplastics accounting for the largest proportion (70%). The(More)
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