Sub-optimal power allocation for downlink OFDMA systems
- 1 January 2004
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 3 (10903038) , 2015-2019
- https://doi.org/10.1109/vetecf.2004.1400392
Abstract
Spectral efficiency is important in designing wireless broadband communication systems. The paper investigates the problem of minimizing overall transmission power while maximizing the spectral efficiency in orthogonal frequency division multiple access (OFDMA) systems. Two adaptive power allocation schemes are presented to allocate transmission power to individual sub-carriers of each user in the downlink frequency-selective fading channels. The proposed algorithms are more computationally efficient than the conventional water-filling algorithm. Performance comparison to the optimal solution shows that the proposed schemes can achieve 99% of the optimum spectral efficiency.Keywords
This publication has 6 references indexed in Scilit:
- The capacity region of frequency-selective Gaussian interference channels under strong interferencePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- An efficient multiuser loading algorithm for OFDM-based broadband wireless systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Elements of Information TheoryPublished by Wiley ,2001
- Asymptotically optimal water-filling in vector multiple-access channelsIEEE Transactions on Information Theory, 2001
- Multiuser OFDM with adaptive subcarrier, bit, and power allocationIEEE Journal on Selected Areas in Communications, 1999
- Gaussian multiaccess channels with ISI: capacity region and multiuser water-fillingIEEE Transactions on Information Theory, 1993