A Feedback-Based Transmission for Wireless Networks with Energy and Secrecy Constraints

EURASIP Journal on Wireless Communications and Networking, Feb 2011

This paper investigates new transmission techniques for clustered feedback-based wireless networks that are characterized by energy and secrecy constraints. The proposed schemes incorporate multiuser diversity gain with an appropriate power allocation (PA) in order to support a defined Quality-of-Service (QoS) and jointly achieve lifetime maximization and confidentiality. We show that an adaptive PA scheme that adjusts the transmitted power using instantaneous feedback and suspends the transmission when the required power is higher than a threshold significantly prolongs the network lifetime without affecting the QoS of the network. In addition, the adaptation of the transmitted power on the main link improves the secrecy of the network and efficiently protects the source message from eavesdropper attacks. The proposed scheme improves network's confidentiality without requiring any information about the eavesdropper channel and is suitable for practical applications. Another objective of the paper is the energy analysis of networks by taking into account processing and maintenance energy cost at the transmitters. We demonstrate that the combination of PA with an appropriate switch-off mechanism, that allows the source to transmit for an appropriate fraction of the time, significantly extends the network lifetime. All the proposed protocols are evaluated by theoretical and simulation results.

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A Feedback-Based Transmission for Wireless Networks with Energy and Secrecy Constraints

EURASIP Journal on Wireless Communications and Networking Hindawi Publishing Corporation A Feedback-Based Transmission for Wireless Networks with Energy and Secrecy Constraints Ioannis Krikidis 1 John S. Thompson (EURASIP Member) 0 Steve McLaughlin (EURASIP Member) 0 Peter M. Grant (EURASIP Member) 0 Lin Cai 0 Institute for Digital Communications, The University of Edinburgh , Mayfield Road, Edinburgh EH9 3JL , UK 1 Department of Computer Engineering & Informatics, University of Patras , Rio, 26500 Patras , Greece This paper investigates new transmission techniques for clustered feedback-based wireless networks that are characterized by energy and secrecy constraints. The proposed schemes incorporate multiuser diversity gain with an appropriate power allocation (PA) in order to support a defined Quality-of-Service (QoS) and jointly achieve lifetime maximization and confidentiality. We show that an adaptive PA scheme that adjusts the transmitted power using instantaneous feedback and suspends the transmission when the required power is higher than a threshold significantly prolongs the network lifetime without affecting the QoS of the network. In addition, the adaptation of the transmitted power on the main link improves the secrecy of the network and efficiently protects the source message from eavesdropper attacks. The proposed scheme improves network's confidentiality without requiring any information about the eavesdropper channel and is suitable for practical applications. Another objective of the paper is the energy analysis of networks by taking into account processing and maintenance energy cost at the transmitters. We demonstrate that the combination of PA with an appropriate switch-off mechanism, that allows the source to transmit for an appropriate fraction of the time, significantly extends the network lifetime. All the proposed protocols are evaluated by theoretical and simulation results. 1. Introduction Recent studies have shown that the Base Station (BS) and its associated operations are the main cause of power consumption in the modern wireless networks [ 1 ]. This result in combination with a continuing expansion of the current networks increases the demands on energy sources as well as some serious environmental issues like the increase of CO2 emissions to the atmosphere [ 1, 2 ]. Therefore, a network design that efficiently uses its available energy resources is an urgent and important research topic. On the other hand, due to the broadcast nature of the transmission, the source message can be received from all the users that are within the transmission range, and therefore secure communication is also of importance. In this paper, we focus on wireless networks with energy and secrecy constraints and investigate some transmission techniques that improve network lifetime and confidentiality for users. Several physical (PHY) layer techniques that decrease the network’s energy requirements and extend the network lifetime have been proposed in the literature. In [ 3, 4 ] the authors introduce multihop transmission in order to reduce the energy consumption and they prove that short intermediate transmissions can result in significant energy savings. Accordingly, the channel capacity gain that arises from the cooperative diversity concept also yields a decrease in the required transmitted power. The energy efficiency of different relaying techniques is discussed in [ 5–8 ], and several relay selection metrics that incorporate instantaneous channelfeedback with residual energy in order to achieve lifetime improvements are presented in [ 9 ]. In addition, appropriate resource allocation strategies can minimize the energy consumption of a wireless network. The impact of scheduling on the network lifetime for different levels of channel knowledge is presented in [ 10 ], and several power allocation (PA) techniques which minimize the average transmission power for different network configurations are discussed in [ 11–13 ]. On the other hand, in addition to the energy cost associated with the transmission process, data processing and system maintenance also contribute to the energy consumption at the transmitters [ 6 ]. In [ 14 ], the authors take into account the processing cost and they prove that dedicated relaying (fixed relaying) is more energy efficient than user cooperation (mobile relaying). Finally, a burst transmission system that switches off the transmitter for a fraction of time in order to reduce the processing cost and accumulate energy for future transmissions is analyzed in [ 15, 16 ] from an information theoretic standpoint. However, the quality of the instantaneous link is not taken into account, and PA as well as QoS issues are not discussed. As for secure communication, various PHY layer techniques that increase the perfect secrecy capacity [ 17, 18 ] of a wireless network have recently been investigated. In [19], the authors propose a joint scheduli (...truncated)


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Ioannis Krikidis, John S. Thompson (EURASIP Member), Steve McLaughlin (EURASIP Member), Peter M. Grant (EURASIP Member). A Feedback-Based Transmission for Wireless Networks with Energy and Secrecy Constraints, EURASIP Journal on Wireless Communications and Networking, 2011, pp. 313269, Volume 2011, Issue 1, DOI: 10.1155/2011/313269