Abstract:

The problem of resource allocation in cognitive radio networks plays an important role to improve the efficiency of spectrum utilization. Most of previous works focus on the power allocation for secondary users in spectrum sharing overlay or spectrum sharing underlay, which needs to frequently handoff between the idle spectrum bands or considers the interference constraints in all spectrum bands respectively. However, how to reduce the handoff between idle spectrum bands and fully utilize the spectrum resource is still an important issue. In this paper, we propose a new spectrum sharing paradigm in cognitive radio networks, which just needs to adjust the transmit power in spectrum bands instead of frequently handoff between idle spectrum bands. And this new spectrum sharing paradigm can also fully utilize the spectrum resource, this is because that we only consider the interference power constraints in active spectrum bands rather than in all spectrum bands. Then based on this new spectrum sharing paradigm and the constraint conditions, we study the distributed power allocation for secondary users. And we formulate the optimization problem as a non-cooperative game problem. And we use the variational inequality approach to solve this game problem and get a Nash Equilibria solution. Finally simulation results are illustrated to demonstrate the performance of the proposed scheme.

Key words:

resource allocation, efficiency, handoff, spectrum sharing paradigm