A Simple Method for Throughput Maximization of OFDMA Based CR Networks

This paper investigates reducing the computation complexity in resource allocation of cognitive radio networks. The orthogonal frequency division multiple access scheme is assumed. Secondary users are permitted to capture any portion of the bands while their interference to the primary users remains below a given threshold level. A very simple method with low complexity for resource allocation is proposed in which the throughput logarithmic function is changed into a linear form. The method is applicable in a wide range of problems where the efforts are maximizing the throughput under power budget and interference constraint. Although the proposed method achieves the optimal solution in low channel-gain-to-noise ratio (CNR) cases, the results for high CNRs are also satisfactory. Comparisons between the proposed method and previous works via simulation show the superior performance of the proposed method.