Multiuser radio resource allocation for multiservice transmission in OFDMA-based cooperative relay networks

Authors:
Xing Zhang;Shuping Chen;Wenbo Wang
Affiliations:
Wireless Signal Processing & Networks Lab, Key Lab of Universal Wireless Communications, Beijing University of Posts and Telecommunications, Beijing, China;Wireless Signal Processing & Networks Lab, Key Lab of Universal Wireless Communications, Beijing University of Posts and Telecommunications, Beijing, China;Wireless Signal Processing & Networks Lab, Key Lab of Universal Wireless Communications, Beijing University of Posts and Telecommunications, Beijing, China
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
Year:
2009

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Abstract

The problem of multiservice transmission in OFDMA-based cooperative relay networks is studied comprehensively. We propose a framework to adaptively allocate power, subcarriers, and data rate in OFDMA system to maximize spectral efficiency under the constraints of satisfying multiuser multiservices' QoS requirements. Specifically, first we concentrate on the single-user scenario which considers multiservice transmission in point-to-point cooperative relay network. Based on the analysis of single-user scenario, we extend the multiservice transmission to multiuser point-to-multipoint scenario. Next, based on the framework, we propose several suboptimal radio resource allocation algorithms for multiservice transmissions in OFDMA-based cooperative relay networks to further reduce the computational complexity. Simulation results show that the proposed algorithms yield much higher spectral efficiency and much lower outage probability, which are flexible and efficient for the OFDMA-based cooperative relay system.