DocumentCode :
1573687
Title :
Adaptive subcarrier and power allocation in OFDM based on maximizing utility
Author :
Song, Guocong ; Li, Ye Geoffrey
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Volume :
2
fYear :
2003
Firstpage :
905
Abstract :
This paper investigates adaptive resource allocation on the downlink of multiuser OFDM networks to achieve both multiuser diversity and fairness. Utility functions are applied to quantify the level of users´ satisfaction derived from the radio resources they occupy. We formulate cross-layer optimization problem as one that maximizes the sum of the utilities over all active users subject to the feasible rate region, which is determined by adaptive resource allocation schemes deployed and the current channel conditions. We present the conditions for optimal subcarrier assignment and power allocation based on utility, and investigate the optimality properties as well. It is also shown that the inherent mechanism of balancing spectral efficiency and fairness is associated with concave utility functions.
Keywords :
OFDM modulation; diversity reception; fading channels; optimisation; resource allocation; adaptive resource allocation; adaptive subcarrier; balancing spectral efficiency; concave utility functions; cross-layer optimization problem; feasible rate region; maximizing utility; multiuser OFDMA networks; multiuser diversity; optimal subcarrier assignment; orthogonal frequency division multiple access; power allocation; radio resources; Downlink; Environmental economics; Frequency diversity; Frequency-selective fading channels; Multiaccess communication; OFDM; Power generation economics; Pricing; Resource management; Wireless networks;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
ISSN :
1090-3038
Print_ISBN :
0-7803-7757-5
Type :
conf
DOI :
10.1109/VETECS.2003.1207757
Filename :
1207757
Link To Document :
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