Channel-adaptive resource allocation for cognitive OFDMA radios based on limited-rate feedback

Antonio G. Marques, Xin Wang, Georgios B. Giannakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Tailored for the emerging class of cognitive radio networks comprising primary and secondary wireless users, the present paper deals with channel-adaptive allocation of subcarriers, rate and power resources for orthogonal frequency-division multiple access (OFDMA). Users rely on adaptive modulation and coding that they select in accordance with the limited-rate feedback they receive from the access point. The access point uses channel state information to maximize the weighted average sum-rate of the network while respecting rate and power constraints on the primary and secondary users. When the channel distribution is available, the optimal off-line allocation is obtained to benchmark performance. In addition, a simple yet optimal on-line algorithm is derived using a stochastic primal-dual approach to solve the constrained utility maximization problem formulated. Analysis and simulations corroborate that the low-complexity online recursive scheme converges to the optimal solution regardless of initialization.

Original languageEnglish (US)
Title of host publication15th European Signal Processing Conference, EUSIPCO 2007 - Proceedings
Pages861-865
Number of pages5
StatePublished - Dec 1 2007
Event15th European Signal Processing Conference, EUSIPCO 2007 - Poznan, Poland
Duration: Sep 3 2007Sep 7 2007

Publication series

NameEuropean Signal Processing Conference
ISSN (Print)2219-5491

Other

Other15th European Signal Processing Conference, EUSIPCO 2007
Country/TerritoryPoland
CityPoznan
Period9/3/079/7/07

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