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Open Access Research Article

Resource Allocation for the Multiband Relay Channel: A Building Block for Hybrid Wireless Networks

Kyounghwan Lee1, Aylin Yener2* and Xiang He2

Author Affiliations

1 Reverb Networks, 20099 Ashbrook Place, Suite 105, Ashburn, VA 20147, USA

2 Wireless Communications and Networking Laboratory, Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, USA

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EURASIP Journal on Wireless Communications and Networking 2010, 2010:792410  doi:10.1155/2010/792410

Published: 29 March 2010

Abstract

We investigate optimal resource allocation for the multiband relay channel. We find the optimal power and bandwidth allocation strategies that maximize the bounds on the capacity, by solving the corresponding max-min optimization problem. We provide sufficient conditions under which the associated max-min problem is equivalent to a supporting plane problem, which renders the solution for an arbitrary number of bands tractable. In addition, the sufficient conditions derived are general enough so that a class of utility functions can be accommodated with this formulation. As an example, we concentrate on the case where the source has two bands and the relay has a single band available and find the optimal resource allocation. We observe that joint power and bandwidth optimization always yields higher achievable rates than power optimization alone, establishing the merit of bandwidth sharing. Motivated by our analytical results, we examine a simple scenario where new channels become available for a transmitter to communicate; that is, new source to relay bands are added to a frequency division relay network. Given the channel conditions of the network, we establish the guidelines on how to allocate resources in order to achieve higher rates, depending on the relative quality of the available links.