Cross-layer optimization for OFDM wireless networks-part II: algorithm development
- 4 April 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Wireless Communications
- Vol. 4 (2), 625-634
- https://doi.org/10.1109/twc.2004.843067
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
This publication has 8 references indexed in Scilit:
- Cross-layer optimization for OFDM wireless networks-part I: theoretical frameworkIEEE Transactions on Wireless Communications, 2005
- Max-utility wireless resource management for best-effort trafficIEEE Transactions on Wireless Communications, 2005
- Opportunistic beamforming using dumb antennasIEEE Transactions on Information Theory, 2002
- FDMA capacity of Gaussian multiple-access channels with ISIIEEE Transactions on Communications, 2002
- On the performance of adaptive modulation in cellular systemsIEEE Transactions on Communications, 1999
- Multiuser OFDM with adaptive subcarrier, bit, and power allocationIEEE Journal on Selected Areas in Communications, 1999
- The Greedy Procedure for Resource Allocation Problems: Necessary and Sufficient Conditions for OptimalityOperations Research, 1986
- Convex AnalysisPublished by Walter de Gruyter GmbH ,1970