Power and Subcarrier Allocation Scheme for Uplink OFDMA

In this contribution, we propose a power and subcarrier allocation scheme for uplink orthogonal frequency division multiple access (OFDMA) based on the capacity difference between different users. The scheme works iteratively and performs three major tasks. In the first step, the subcarrier with largest capacity difference of two active users is found. Then, the subcarrier selection of these two users is altered, with subsequent power allocation over their active carriers. During the last step, the subcarrier of the user which maximizes the sum-rate is kept active. As one user is deselected per subcarrier during each iteration, the algorithm will stop after M·(K–1) iterations. Furthermore, we will compare our scheme with some known schemes from the literature.