Power-efficient wireless OFDMA using limited-rate feedback

Antonio G. Marques; Georgios B Giannakis; Fadel F. Dignam; F. Javier Ramos

doi:10.1109/TWC.2008.060629

Power-efficient wireless OFDMA using limited-rate feedback

Antonio G. Marques, Georgios B Giannakis, Fadel F. Dignam, F. Javier Ramos

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Emerging applications involving low-cost wireless sensor networks motivate well optimization of multi-user orthogonal frequency-division multiple access (OFDMA) in the power-limited regime. In this context, the present paper relies on limited-rate feedback (LRF) sent from the access point to terminals to minimize the total average transmit-power under individual average rate and error probability constraints. Along with the characterization of optimal bit, power and subcarrier allocation policies based on LRF, suboptimal yet simple schemes are developed for channel quantization. The novel algorithms proceed in two phases: (i) an off-line phase to construct the channel quantizer as well as the rate and power codcbooks with moderate complexity; and (ii) an on-line phase to obtain, based on quantized channel state information, the optimum, rate, power and user-subcarrier allocation with linear complexity. Numerical examples corroborate the analytical claims and reveal that significant power savings result even with suboptimal schemes based on practically affordable LRF.

Original language	English (US)
Article number	4450837
Pages (from-to)	685-696
Number of pages	12
Journal	IEEE Transactions on Wireless Communications
Volume	7
Issue number	2
DOIs	https://doi.org/10.1109/TWC.2008.060629
State	Published - Feb 2008

Bibliographical note

Funding Information:
Manuscript received August 25, 2006; revised July 19, 2007; accepted October 29, 2007. The associate editor coordinating the review of this letter and approving it for publication was H. Li. The work in this paper was supported by the US ARL under the CTA Program, Cooperative Agreement No. DAAD19-01-2-0011; by USDoD ARO grant No. W911NF-05-1-0283; by Spanish Government grant No. TEC2005-06766-C03-01/TCM, and by the Government of C.A. Madrid grant No. P-TIC-000223-0505. Parts of this paper were presented in the IEEE Wireless Communications and Networking Conference, Hong Kong, March 2007 and the IEEE International Conference on Communications, Glasgow, June 2007.

Keywords

Feedback communication
Frequency division multiaccess
Minimum energy control
Optimization methods
Quantization
Resource management

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abstract = "Emerging applications involving low-cost wireless sensor networks motivate well optimization of multi-user orthogonal frequency-division multiple access (OFDMA) in the power-limited regime. In this context, the present paper relies on limited-rate feedback (LRF) sent from the access point to terminals to minimize the total average transmit-power under individual average rate and error probability constraints. Along with the characterization of optimal bit, power and subcarrier allocation policies based on LRF, suboptimal yet simple schemes are developed for channel quantization. The novel algorithms proceed in two phases: (i) an off-line phase to construct the channel quantizer as well as the rate and power codcbooks with moderate complexity; and (ii) an on-line phase to obtain, based on quantized channel state information, the optimum, rate, power and user-subcarrier allocation with linear complexity. Numerical examples corroborate the analytical claims and reveal that significant power savings result even with suboptimal schemes based on practically affordable LRF.",

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Power-efficient wireless OFDMA using limited-rate feedback

Abstract

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Keywords

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