Subchannel and Power Allocation in OFDMA-Based Cognitive Radio Networks

J. Guo, S. Gu, X. Wang, H. Yu, M. Guizani
2010 2010 IEEE International Conference on Communications  
Recently, there has been a great interest in cognitive radio networks. In addition, the use of subchannel allocation and power distribution in OFDM systems have been discussed in the literature and proven to help improve the capacity performance in cooperative networks. Therefore, in this paper we propose to add a primary source-destination pair to the secondary system in a cognitive radio network. We also provide the analysis of a subchannel and power allocation in cognitive networks. The
more » ... networks. The optimal solution for such a problem is shown to be exponentially complex computationally. Therefore, we propose a suboptimal algorithm to reduce the complexity and achieve a close to optimal solution for which the subchannel allocation and power distribution among transmitters in the secondary system are performed in two steps. In the power allocation step, for each source-relay and relay-destination pair, peak interference power constraints of the primary system are being considered simultaneously. Simulation results are presented showing that the performance of the proposed suboptimal algorithm approach performs asymptotically to the optimal algorithm solution, which proves the correctness of this approach.
doi:10.1109/icc.2010.5502111 dblp:conf/icc/GuoGWYG10 fatcat:3zeioinaenbzxfrwjogzmdgiza