A fast adaptive power allocation for maximizing a discrete utility function of OFDMA system

Abstract

In this paper, we propose a fast adaptive power allocation algorithm for an orthogonal frequency division multiple access (OFDMA) system that employs an adaptive modulation and coding (AMC) scheme to significantly reduce the processing time. We show that the proposed algorithm reduces the complexity by M -the number of AMC levels- times compared with greedy adaptive power allocation (APA) which is known as the optimal algorithm for power allocation problem while still maintaining the utility at the same level as greedy APA.