Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI
Abstract
Most of the existed works on the radio resource allocation (RRA) problem commonly assume the channel-state information (CSI) can be perfectly obtained by the transmission source. However, such assumption is not practical in the realistic wireless systems. In this work, we consider the practical implementation issues of resource allocation in orthogonal frequency division multiple access (OFDMA) two-way relay networks: the inaccuracy of channel-state information (CSI) available to the source. Instead, only the estimated channel status is known by the source. In this context, a joint optimization of subcarrier pairing and allocation, relay selection, and transmit power allocation is formulated in OFDMA two-way amplify-and-forward relay networks. Moreover, the objective of this work is to minimize the energy consumption of the overall system. Further, to ensure the quality of service (QoS) or data rate requirement, the energy consumption must be minimized without compromising the QoS. Therefore, by applying convex optimization techniques, energy-efficient algorithms are developed with the objective to minimize the total transmit power with guaranteeing the required data rates. Through simulation studies, energy consumption performance of the systems under the proposed schemes is investigated. It can be observed that our proposed scheme can improve the energy consumption performance of the considered system.
Main Authors
Format
Articles
Research article
Published
2015
Series
Subjects
Publication in research information system
Publisher
SpringerOpen
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-201510193400Use this for linking
Review status
Peer reviewed
ISSN
1687-1472
DOI
https://doi.org/10.1186/s13638-015-0455-6
Language
English
Published in
Eurasip Journal on Wireless Communications and Networking
Citation
- Chang, Z., Zhang, Q., Guo, X., & Ristaniemi, T. (2015). Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI. Eurasip Journal on Wireless Communications and Networking, 2015(225). https://doi.org/10.1186/s13638-015-0455-6
Funder(s)
Research Council of Finland
Funding program(s)
KV-yhteishanke, SA
Joint International Project, AoF

Additional information about funding
This work is partially supported by the Academy of Finland (Decision No. 284748, 288473).
Copyright© 2015 Chang et al. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.