Adaptive Subcarrier and Bit Allocation for Downlink OFDMA System With Proportional Fairness
This paper investigates the adaptive subcarrier and bit allocation algorithm for OFDMA systems. To minimize overall transmitted power, the authors propose a novel adaptive subcarrier and bit allocation algorithm based on Channel State Information (CSI) and Quality State Information (QSI). A suboptimal approach that separately performs subcarrier allocation and bit loading is proposed. It is shown that a near optimal solution is obtained by the proposed algorithm which has low complexity compared to that of other conventional algorithm.