Low-complexity resource allocation in rate-constrained OFDMA downlink systems

A resource allocation algorithm with quality of service(QoS) guarantees in a cellular orthogonal frequency division multiple access(OFDMA) network is proposed.The algorithm is a modified water-filling algorithm.In the first phase,power and subcarriers are allocated together,and in the second phase,users' minimum data rate requ irements are met,while the remaining resources are allocated in order to maximi ze sum rate.It is a cell-level algorithm,and its main advantages are low implementation complexity and capacity of maintaining higher ratio of QoS satisf ying users' requirements.Simulation results show that this scheme outperform s other proportional resour ce allocation schemes.