Low Complexity Greedy Power Allocation Algorithm for Proportional Resource Allocation in Multi-User OFDM Systems

Autor: Moawad I. Dessouky, Waleed E. Al-Hanafy, Najib A. Odhah, Fathi E. Abd El-Samie
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: Journal of Telecommunications and Information Technology, Iss 4 (2012)
Druh dokumentu: article
ISSN: 1509-4553
1899-8852
DOI: 10.26636/jtit.2012.4.1290
Popis: Multi-User Orthogonal Frequency Division Multiplexing (MU-OFDM) is an efficient technique for achieving high downlink capacity in high-speed communication systems. A key issue in MU-OFDM is the allocation of the OFDM subcarriers and power to users sharing the channel. In this paper a proportional rate-adaptive resource allocation algorithm for MU-OFDM is presented. Subcarrier and power allocation are carried out sequentially to reduce the complexity. The low complexity proportional subcarriers allocation is followed by Greedy Power Allocation (GPA) to solve the rate-adaptive resource allocation problem with proportional rate constraints for MU-OFDM systems. It improves the work of Wong et al. in this area by introducing an optimal GPA that achieves approximate rate proportionality, while maximizing the total sum-rate capacity of MU-OFDM. It is shown through simulation that the proposed GPA algorithm performs better than the algorithm of Wong et al., by achieving higher total capacities with the same computational complexity, especially, at larger number of users and roughly satisfying user rate proportionality.
Databáze: Directory of Open Access Journals