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An important problem of cognitive radio (CR) is how to make use of spectrum resources effectively. Spectrum sharing is one of the key technologies for addressing problems. Based on the existing spectrum sharing scheme of non-cooperative game theory, an improved utility function of the secondary user is proposed by introducing a new reinforced factor which is based on spectrum occupancy of the secondary...
This paper mainly focused on resource allocation algorithm in Cognitive Radio networks. We proposed one semi-static resource allocation algorithm based on OFDMA-TDD. This algorithm can determine whether secondary users get the rights to seize the shared spectrum according to the required data rate of secondary users, so it can make the primary users share the spectrum with secondary users so as to...
In order to fully utilize the scarce wireless spectrum resources, many dynamic spectrum access approaches have emerged to enhance the spectrum efficiency in the spectrum market. From the economic point of view, in this paper we investigate the demand responsive pricing competition between two cognitive mobile virtual network operators (MVNOs) in a duopoly spectrum market and verify the pricing decisions...
The availability of the spectrum opportunity to the secondary users is related to the activity of the frequency channels. In this paper, we research the activity of the channels in opportunistic spectrum sharing. A three-state continuous-time Markov chain is proposed to describe the activity of the channel. A formulation under the service traffics for the model is given and the probabilities of the...
This paper addresses two issues about spectrum sensing in heterogenous wireless networks (HWNs). One is the optimization of spectrum sensing periods. The other is the efficient scheduling between sensing periods and transmission periods. The optimal programming to maximize the achievable throughput for the unlicensed users with licensed users sufficiently protected is used to get the solution for...
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