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This paper aims to investigate the resource allocation problem in a relay-assisted OFDMA cognitive radio (CR) system. Different from conventional CR resource allocation problems, a joint bandwidth and power optimization framework using the bandwidth-power product metric is proposed. Besides, rate requirement of the secondary system is satisfied and interference power at the primary receiver is limited...
In cognitive vehicular networks, cooperation transmission has many advantages to access licensed spectrum under interference constraints, by exploring space diversity of vehicles. And in the urban city, there are many candidate vehicles can be a cooperation relay especially when traffic congestion. Recently many papers concern about cognitive multi-hop network, but most of them only analyzed the performance...
Area spectral efficiency (ASE) was introduced as a metric to quantify the spectral utilization efficiency of cellular systems. Unlike other performance metrics, ASE takes into account the spatial property of cellular systems. In this paper, we generalize the concept of ASE to study arbitrary wireless transmissions. Specifically, we introduce the notion of affected area to characterize the spatial...
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