DocumentCode :
757818
Title :
Cross-layer optimization for OFDM wireless networks-part II: algorithm development
Author :
Song, Guocong ; Li, Ye Geoffrey
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Volume :
4
Issue :
2
fYear :
2005
fDate :
3/1/2005 12:00:00 AM
Firstpage :
625
Lastpage :
634
Abstract :
We have established a theoretical framework for cross-layer optimization in orthogonal frequency division multiplexing (OFDM) wireless networks. In this paper, we focus on effective and practical algorithms for efficient and fair resource allocation in OFDM wireless networks. We have taken various conditions into account and developed a variety of efficient algorithms, including sorting-search dynamic subcarrier assignment, greedy bit loading, and power allocation, as well as objective aggregation algorithms. We have also modified those algorithms for a certain type of nonconcave utility functions. To further improve performance by exploiting time diversity, a low-pass time filter can be easily incorporated into all of the algorithms. Simulation results have confirmed that the utility-based cross-layer optimization can significantly enhance the system performance and guarantee fairness. The gains come from multiuser diversity, frequency diversity, as well as time diversity. The fairness is automatically achieved by the behavior of marginal utility functions.
Keywords :
OFDM modulation; diversity reception; low-pass filters; optimisation; radio networks; resource allocation; OFDM wireless network; cross-layer optimization; fair resource allocation; frequency diversity; greedy bit loading; low-pass time filter; marginal utility function; multiuser diversity; nonconcave utility function; objective aggregation algorithm; orthogonal frequency division multiplexing; power allocation; sorting-search dynamic subcarrier assignment; Collaborative work; Fading; Frequency diversity; Frequency division multiplexing; Heuristic algorithms; Low pass filters; OFDM; Resource management; System performance; Wireless networks; Cross-layer optimization; frequency diversity; multiuser diversity; orthogonal frequency division multiplexing (OFDM) network; time diversity;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2004.843067
Filename :
1413228
Link To Document :
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