A New Resource Allocation Algorithm in OFDM System

摘要

In this paper, we present an improved power allocation algorithm that maximizes the total capacity in the OFDM system. The improved allocation algorithm is based on the existing water-filling algorithm. To reduce the computational complexity in calculating water-filling level and make up for'the shortcomings of the equally distributed algorithm, we propose the improved allocation algorithm where some subcarriers adopt water-filling algorithm and others take equally distributed algorithm. Besides, we will introduce two parameters VI and V in the equally distributed algorithm to increase the system performance. Simulation has been done to prove that our algorithm has the performance better to the existing water-filling algorithm and has the lower computational complexity than it. Our algorithm also can be used in actual systems.