Computer Science ›› 2017, Vol. 44 ›› Issue (5): 48-52.doi: 10.11896/j.issn.1002-137X.2017.05.009

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Suboptimal Dynamic Resource Allocation Algorithm in OFDM Based Cognitive Radio Network

HAN Jie, SONG Xiao-qin, DONG Li and JIN hui   

  • Online:2018-11-13 Published:2018-11-13

Abstract: This paper investigated the multi-user resource allocation in OFDM-based cognitive radio(CR-OFDM) including subcarrier allocation and power allocation.In CR system,not only the interference between primary uers(PUs) and second users(SUs) is considered,but also the interference caused by SUs need to be controlled under the threshold.Thus the system model is more complicated.Because of the integer constraints,the complexity of the algorithm which can obtain optimal solution is too high to suit for real-time systems.Therefore,this paper proposed a distributed algorithm to obtain the suboptimal solution with low complexity.First,a subcarrier allocation algorithm considering power constraint and interference constraint was proposed and then a modified linear water-filling algorithm was put forward to allocate power.Simulation results show that the proposed algorithm can obtain the satisfactory system capacity and reduce the complexity in comparison with the optimal Lagrange dual method,which is more suitable for real-time systems.

Key words: Cognitive radio network,OFDM,Resource allocation,Linear water-filling algorithm

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