A1 Journal article (refereed)
Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI (2015)

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

JYU authors or editors

Publication details

All authors or editors: Chang, Zheng; Zhang, Qianqian; Guo, Xijuan; Ristaniemi, Tapani

Journal or series: Eurasip Journal on Wireless Communications and Networking

ISSN: 1687-1472

eISSN: 1687-1499

Publication year: 2015

Volume: 2015

Issue number: 225

Publisher: SpringerOpen

Place of Publication: Heidelberg

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1186/s13638-015-0455-6

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/47404

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.

Keywords: energy efficiency

Free keywords: OFDMA; Two-way relay; Subcarrier pairing; Radio resource allocation; Imperfect channel-state information

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Ministry reporting: Yes

VIRTA submission year: 2015

JUFO rating: 1